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Bold=Widely accepted scientific name provided by John Kartesz, ultimate authority for all plant names on this web site.
Not bold = synonym for the scientific name.


ssp.=subspecies       var.=variety
GENUS AND SPECIES COMMON NAME SCIENTIFIC FAMILY NAME COMMON FAMILY NAME COLOR OF FLOWER,
TYPE OF PLANT
VEGETATION ZONE HABITAT SEASON
OF
BLOOM
        Flower, (brown/green, blue/purple,  pink/red/orange, white, or yellow), 
fern, 
or tree.
Alpine, subalpine, montane, foothills (including mesas), semi-deserts (including canyons). Tundra, scree, woodlands, wetlands, streamsides, openings, meadows, rocks, canyons, shrublands, disturbed areas (roadsides, mined areas, timbered lands, avalanche chutes, rock slides), semi-deserts. Spring,
summer,
fall.
Machaeranthera bigelovii Tansy Aster Asteraceae Sunflower Purple Foothills, montane, subalpine Disturbed areas, openings Fall
Machaeranthera canescens Tansy Aster Asteraceae Sunflower Purple Foothills, montane, subalpine Disturbed areas, openings Fall
Machaeranthera coloradoensis Colorado Tansy Aster Asteraceae Sunflower Pink Montane, subalpine, alpine Meadows, openings, rocks, tundra Summer
Machaeranthera grindelioides   Asteraceae Sunflower Yellow Semi-desert Openings, rimrock Spring
Machaeranthera pinnatifida   Asteraceae Sunflower Yellow Semi-desert Openings, hillsides Spring
Mahonia fremontii Barberry Berberidaceae Barberry Yellow Semi-desert Shrublands, woodlands,
openings
Spring
Mahonia repens Oregon Grape Berberidaceae Barberry Yellow Foothills, montane, subalpine Woodlands, openings Spring
Maianthemum amplexicaule Solomon's Plume Ruscaceae Butcher's Broom White Montane, subalpine Woodlands Spring
Maianthemum racemosum
ssp.
amplexicaule
Solomon's Plume Ruscaceae Butcher's Broom White Montane, subalpine Woodlands Spring
Maianthemum stellatum Star Lily Ruscaceae Butcher's Broom White Montane, subalpine Woodlands Spring
Malacothrix sonchoides Desert Dandelion Asteraceae Sunflower Yellow Semi-desert, foothills Openings, meadows Spring, summer
Malcolmia africana African Mustard Brassicaceae Mustard Pink Semi-desert, foothills Disturbed areas, openings Spring, summer
Malva neglecta Cheeseweed Malvaceae Mallow Pink Foothills Disturbed areas Summer
Marrubium vulgare Catnip Lamiaceae Mint White Foothills Disturbed areas Spring, summer
Medicago lupulina Black Medic Fabaceae Pea Yellow Foothills, montane Disturbed areas, road and trail-sides, lawns Spring, summer
Medicago sativa Alfalfa Fabaceae Pea Blue Foothills, montane Fields, openings Spring, summer,
fall
Melilotus alba White Sweet
Clover
Fabaceae Pea White Semi-desert, foothills, montane Disturbed areas, meadows Spring, summer
Melilotus officinalis Yellow Sweet
Clover
Fabaceae Pea Yellow Semi-desert, foothills, montane Disturbed areas, meadows Spring, summer
Mentha arvensis Mint Lamiaceae Mint Blue Montane Wetlands Summer
Mentzelia albicaulis Mentzelia Loasaceae Loasa Yellow
Desert, semi-desert
Shrublands, openings
Spring
Mentzelia pterosperma Mentzelia Loasaceae Loasa Yellow Desert, semi-desert Shrublands, openings Spring
Mentzelia rusbyi

Rusby's Mentzelia

Loasaceae Loasa Yellow Semi-desert, foothills Openings Summer
Menyanthes trifoliata Buckbean Menyanthaceae Buckbean White Montane, subalpine Ponds Summer
Mertensia brevistyla Bluebells Boraginaceae Forget-Me-
Not
Blue Foothills, montane Woodlands, meadows, openings Spring, summer
Mertensia ciliata Bluebells Boraginaceae Forget-Me-
Not
Blue Montane, subalpine Streamsides Summer
Mertensia franciscana Bluebells Boraginaceae Forget-Me-
Not
Blue Montane, subalpine Streamsides Summer
Mertensia fusiformis Spindle-rooted
Bluebells
Boraginaceae Forget-Me-
Not
Blue Foothills, montane Woodlands, meadows, openings Spring, summer
Mertensia  lanceolata Bluebells Boraginaceae Forget-Me-
Not
Blue  Foothills to alpine Woodlands, meadows, openings Spring, summer
Mesynium aristatum Yellow Flax Linaceae Flax Yellow Semi-desert Shrublands,
openings
Spring, summer
Mesynium puberulum Yellow Flax Linaceae Flax Yellow Semi-desert, foothills Openings, meadows Spring
Micranthes odontoloma Brook Saxifrage Saxifragaceae Saxifrage White Subalpine Streamsides Summer
Micranthes oregana Snowball Saxifrage Saxifragaceae Saxifrage White Montane, subalpine, alpine Marshy areas, tundra Summer
Micranthes rhomboidea Snowball Saxifrage Saxifragaceae Saxifrage White Montane, subalpine, alpine Tundra, rocks, openings Summer
Microsteris gracilis   Polemoniaceae Phlox White Foothills Openings, shrublands, woodlands Spring
Mimulus eastwoodiae Monkeyflower Phrymaceae
formerly
Scrophulariaceae
Lopseed Red      
Mimulus guttatus Monkeyflower Phrymaceae
formerly
Scrophulariaceae
Lopseed Yellow Montane, subalpine Streamsides Summer
Mimulus suksdorfii Monkeyflower Phrymaceae
formerly
Scrophulariaceae
Lopseed Yellow Semi-desert Sand, openings Spring
Mimulus tilingii var. tilingii Monkeyflower Phrymaceae
formerly
Scrophulariaceae
Lopseed Yellow Subalpine Streamsides Summer
Chickweed
Caryophyllaceae Pink White Alpine Tundra Summer
Alpine Sandwort Caryophyllaceae Pink White Alpine Tundra Summer
Red Sandwort Caryophyllaceae Pink White Subalpine, alpine
Scree, tundra
Summer
Mirabilis multiflora
Four O'Clocks Nyctaginaceae Four O'Clock Pink Semi-desert, foothills Roadsides, open canyons Spring, summer, fall
Mirabilis oxybaphoides Four O'Clocks Nyctaginaceae Four O'Clock Pink Semi-desert, foothills Woodlands, roadsides, openings Summer, fall
Mitella pentandra Mitrewort Saxifragaceae Saxifrage Green Montane, subalpine Woodlands, wetlands Summer
Mitella stauropetala Mitrewort Saxifragaceae Saxifrage White Montane, subalpine Woodlands,  streamsides, wetlands Summer
Moehringia macrophylla   Caryophyllaceae Pink White Montane, subalpine Moist, open woodlands Summer
Monardella odoratissima   Lamiaceae Mint Pink Foothills, montane, subalpine Open rocky areas Summer, fall
Moneses uniflora Single Delight Ericaceae Heath White Montane, subalpine Woodlands Summer
Monolepis nuttalliana   Amaranthaceae
formerly
Chenopodiaceae
Amaranth
formerly
Goosefoot
Red Semi-desert Shrublands, openings Spring
Nama retrorsum   Boraginaceae Forget-Me-Not Pink Semi-desert Open sands Spring
Nasturtium officinale Water Cress Brassicaceae Mustard White Semi-desert, foothills, montane Springs, streams Summer
Navarretia breweri   Polemoniaceae Phlox Yellow Foothills, montane Openings, woodlands Summer
Navarretia sinistra
ssp.
sinistra
Alva Day's Gilia Polemoniaceae Phlox White Semi-desert, foothills Openings Spring
Negundo aceroides Box Elder Sapindaceae
formerly
Aceraceae
Soapberry
formerly
Maple
Tree Semi-desert, foothills, montane Washes, streamsides  Spring
Neokochia americana   Amaranthaceae
formerly
Chenopodiaceae
Amaranth
formerly
Goosefoot
Brown/Green Semi-desert Shrublands, openings Spring
Neottia cordata Heartleaf Twayblade Orchidaceae Orchid Green Subalpine Wetlands, streamsides Summer
Nicotiana attenuata Coyote Tobacco Solanaceae Nightshade White Semi-desert, foothills Openings, woodlands Summer, fall
Noccaea fendleri
ssp
. glauca
Wild Candytuft Brassicaceae Mustard White Foothills, montane, subalpine Woodlands, openings, meadows Spring, summer
Noccaea montana Wild Candytuft Brassicaceae Mustard White Semi-desert foothills, montane, subalpine Woodlands, openings, meadows Spring, summer
Nuttallia pterosperma Mentzelia Loasaceae Loasa Yellow Desert, semi-desert Shrublands, openings Spring
Oenothera albicaulis Evening Primrose Onagraceae Evening Primrose White Semi-desert, foothills Sandy openings Spring
Oenothera caespitosa Evening Primrose Onagraceae Evening Primrose White Semi-desert, foothills, montane Disturbed areas, openings Spring
Oenothera elata
ssp.
hirsutissima
Hooker's
Evening Primrose
Onagraceae Evening Primrose Yellow Foothills, montane Wet meadows and roadsides Summer
Oenothera flava ssp. flava Evening Primrose Onagraceae Evening Primrose Yellow Foothills, montane Openings, meadows Spring, summer
Oenothera coronopifolia Evening Primrose Onagraceae Evening Primrose White Foothills, montane Woodlands, openings Spring, summer
Oenothera lavandulifolia Evening Primrose Onagraceae Evening Primrose Yellow Semi-desert Shrublands, openings Spring, summer
Oenothera longissima Bridges
Evening Primrose
Onagraceae Evening Primrose Yellow Semi-desert Washes, streams Summer, fall
Oenothera pallida Evening Primrose Onagraceae Evening Primrose White Semi-desert Shrublands, openings Spring, summer
Oligosporus dracunculus Wild Tarragon Asteraceae Sunflower Yellow Foothills, montane Rocky openings, roadsides Summer
Onobrychis viciifolia Sain Foin Fabaceae Pea Pink Foothills, montane Roadsides Summer, fall
Opuntia fragilis Potato Cactus Cactaceae Cactus Yellow Semi-desert, foothills Sandy and rocky openings Summer
Opuntia phaeacantha Prickly Pear Cactus Cactaceae Cactus Yellow Semi-desert, foothills Openings Spring, summer
Opuntia polyacantha
Prickly Pear Cactus
Cactaceae Cactus Yellow, red Semi-desert, foothills Openings Spring, summer
Oreobroma nevadense

Bitterroot,
Lewesia

Montiaceae
formerly
Portulacaceae
Miner's Lettuce
formerly
Purslane

White, pink Montane Meadows, open woods Spring, summer
Oreobroma pygmaea Bitterroot,
Lewesia
Montiaceae
formerly
Portulacaceae
Miner's Lettuce
formerly
Purslane
Pink Montane, subalpine, alpine Woodlands, openings, meadows, tundra Spring, summer
Oreocarya flava Cryptantha Boraginaceae Forget-Me-Not Yellow Semi-desert, foothills Openings Spring
Oreocarya flavoculata Cryptantha Boraginaceae Forget-Me-Not White Semi-desert, foothills Openings Spring
Oreocarya fulvocanescens Cryptantha Boraginaceae Forget-Me-Not White/Yellow Semi-desert Openings Spring
Oreocarya humilis Cryptantha Boraginaceae Forget-Me-Not White Semi-desert Openings Spring
Oreocarya paradoxa Cryptantha Boraginaceae Forget-Me-Not White Semi-desert Openings Spring
Oreocarya revealii Cryptantha Boraginaceae Forget-Me-Not White Semi-desert Openings Spring
Oreocarya suffruticosa
variety pustulosa
Cryptantha Boraginaceae Forget-Me-Not White Semi-desert Openings Spring, summer
Oreocarya tenuis Cryptantha Boraginaceae
Forget-Me-Not
White Semi-desert Openings Spring
Oreochrysum parryi   Asteraceae Sunflower Yellow Subalpine Woodlands Summer
Oreoxis alpina ssp. alpina Alpine Parsley Apiaceae Parsley Yellow Alpine Montane to tundra Summer
Oreoxis bakeri
Alpine Parsley
Apiaceae Parsley Yellow Alpine Sub-alpine to tundra Summer
Orobanche cooperi  Broomrape Orobanchaceae Broomrape Purple Semi-desert Woodlands, openings Spring, summer
Orobanche fasciculata
Broomrape
Orobanchaceae Broomrape Red Foothills, montane Openings, shrublands,  woodlands Summer
Broomrape
Orobanchaceae Broomrape Red Semi-desert, foothills, montane Openings, shrublands,  woodlands Summer
Orogenia linearifolia Turkeypea,
Indian Potato
Apiaceae Parsley White Foothills, montane Meadows Spring
Orthilia secunda One-sided
Wintergreen
Ericaceae
formerly
Pyrolaceae
Heath
formerly
Pyrola

White
Montane, subalpine Woodlands Summer
Orthocarpus luteus Owl-clover Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Yellow Foothills, montane Woodlands Summer
Orthocarpus purpureoalbus Owl-clover Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Purple/white Foothills, montane Woodlands Summer
Osmorhiza berteroi
Sweet Cicely
Apiaceae Parsley White Montane, subalpine Woodlands Spring, summer
Osmorhiza chilensis
Sweet Cicely
Apiaceae Parsley White Montane, subalpine Woodlands Spring, summer
Osmorhiza depauperata Sweet Cicely Apiaceae Parsley White Montane, subalpine Woodlands Spring, summer
Osmorhiza occidentalis Western
Sweet Cicely
Apiaceae Parsley Yellow Montane, subalpine Woodland, meadows Spring, summer
Ostrya knowltonii
var. knowltonii  
 
Western
Hophornbeam
Betulaceae Birch Family Tree Semi-desert Canyons Spring
Oxalis dillenii Wood Sorrel Oxalidaceae Wood Sorrel Yellow Montane Openings Summer
Oxalis violacea Wood Sorrel Oxalidaceae Wood Sorrel Blue Montane Openings Summer
Oxybaphus linearis Umbrellawort Nyctaginaceae Four O'Clock Pink Semi-desert, foothills Woodlands, openings, roadsides Summer, fall
Oxypolis fendleri Cowbane Apiaceae Parsley White Montane, subalpine Streamsides Spring, summer
Oxyria digyna Mountain Sorrel Polygonaceae Buckwheat Red Subalpine, alpine Tundra, scree Summer
Oxytenia acerosa Copperweed Asteraceae Sunflower Yellow Semi-desert Washes Summer
Oxytropis deflexa variety
foliolosa
  Fabaceae Pea Blue Alpine Tundra Summer
Oxytropis deflexa variety
sericea
  Fabaceae Pea Blue Montane, subalpine Meadows Summer
Oxytropis lambertii
var.
bigelovii
  Fabaceae Pea Pink Semi-desert, foothills, montane Openings, grasslands, shrublands, woodlands Spring, summer
Oxytropis parryi   Fabaceae Pea Blue Sub-alpine, alpine Rocky knolls, tundra Summer

GENUS AND SPECIES COMMON NAME SCIENTIFIC FAMILY NAME COMMON FAMILY NAME COLOR OF FLOWER,
TYPE OF PLANT
VEGETATION ZONE HABITAT SEASON
OF
BLOOM
Packera crocata   Asteraceae Sunflower Orange Montane, subalpine Woodlands, openings Summer
Packera dimorphophylla   Asteraceae Sunflower Yellow Subalpine, alpine Meadows, rocks, tundra Summer
Packera mancosana Mancos Shale Packera Asteraceae Sunflower Yellow Montane Openings Summer
Packera multilobata   Asteraceae Sunflower Yellow Semi-desert foothills Woodlands, openings Spring,
summer
Packera neomexicana
var. mutabilis
  Asteraceae Sunflower Yellow Foothills, montane, subalpine Woodlands, openings Summer
Packera oodes   Asteraceae Sunflower Yellow Foothills, montane Woodlands, openings Summer
Packera pseudaurea   Asteraceae Sunflower Yellow Montane Wetlands Summer
  Asteraceae Sunflower Yellow Foothills, montane Woodlands, openings Summer
Packera werneriifolia   Asteraceae Sunflower Yellow Subalpine, alpine Meadows, tundra, scree Summer
Padus virginiana Chokecherry Rosaceae Rose White Foothills, montane Shrublands, woodlands Spring
Parnassia fimbriata
var.
fimbriata
Grass of Parnassus Parnassiaceae

Grass
of Parnassus
White Subalpine Streamsides, wetlands Summer
Parnassia parviflora Grass of Parnassus Parnassiaceae

Grass
of Parnassus
White Montane, subalpine Streamsides, wetlands Summer
Paxistima myrsinites Mountain Lover Celastraceae Staff-tree Red Foothills, montane, subalpine Woodlands Spring
Pectiantia pentandra Mitrewort Saxifragaceae Saxifrage Green Montane, subalpine Woodlands, wetlands Summer
Pectis angustifolia
var. angustifolia
  Asteraceae Sunflower Yellow Semi-desert Sand openings, shrublands Summer,
fall
Pedicularis bracteosa
var.
paysoniana
Fern Leaf
Lousewort
Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Yellow Subalpine Woodlands Summer
Pedicularis centranthera   Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Pink Semi-desert, foothills Shrublands, woodlands Spring
Pedicularis groenlandica Elephant Heads Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Pink Subalpine Wetlands, streamsides Summer
Pedicularis parryi
ssp.
parryi
Alpine Lousewort Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Yellow Subalpine, alpine Woodlands, meadows, openings Summer
Pedicularis procera Towering
Lousewort
Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Yellow Montane, subalpine Woodlands, openings Summer
Pedicularis racemosa Parrot's Beak Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
White Subalpine Woodlands Summer
Pedicularis scopulorum   Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Pink Subalpine, alpine Rocky areas, wet areas, tundra. Summer
Pedicularis sudetica
ssp. scopulorum
  Orobanchaceae
formerly
Scrophulariaceae
Broomrape
formerly
Snapdragon
Pink Subalpine, alpine Rocky areas, wet areas, tundra. Summer
Pediocactus simpsonii   Cactaceae Cactus Yellow Foothills Openings Summer
Pediomelum megalanthum
var. megalanthum
Indian Breadroot Fabaceae Pea White Semi-desert, foothills Openings, shrublands Spring
Penstemon angustifolius Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Semi-desert Woodlands, openings Spring,
summer
Penstemon barbatus Scarlet Bugler Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Red Semi-desert, foothills Woodlands, openings
Spring,
summer
Penstemon breviculus Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Semi-desert Openings Spring
Penstemon crandallii
(formerly identified here as
P. caespitosus
)
Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Semi-desert, foothills, montane Openings Spring,
summer
Penstemon comarrhenus Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Foothills, montane Open woodlands Summer
Penstemon cyanocaulis Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Foothills Meadows, openings Spring, summer
Penstemon eatonii Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Pink Semi-desert, foothills Openings, shrublands, woodlands Spring, summer
Penstemon hallii Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Alpine Scree Summer
Penstemon harbourii Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Alpine Scree Summer
Penstemon lentus
var.
lentus
and variety albiflorus
Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Semi-desert, foothills Openings, woodlands Spring
Penstemon linarioides
ssp.
coloradoensis
Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Semi-desert, foothills Openings, woodlands Spring,
summer
Penstemon osterhoutii
(
see Penstemon lentus)
Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue/Purple Semi-desert, foothills Openings, woodlands Spring
Penstemon rostriflorus Bridges
Penstemon
Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Red Foothills Openings, woodlands Summer
Penstemon strictus Rocky Mountain
Penstemon
Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Blue Foothills, montane, subalpine Meadows, openings Summer
Penstemon utahensis Utah Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Pink Semi-desert, foothills Canyons, openings, shrublands Spring
Penstemon whippleanus Penstemon Plantaginaceae
formerly
Scrophulariaceae
Plantain
formerly
Snapdragon
Purple Subalpine Woodlands, openings Summer
Pentaphylloides floribunda Shrubby Cinquefoil Rosaceae Rose Yellow Foothills, montane, subalpine Meadows Summer
Peraphyllum ramosissimum Squaw Apple Rosaceae Rose White Foothills Woodlands, openings Spring
Peritoma lutea
Beeplant
Cleomaceae Cleome Yellow Semi-desert, foothills, montane Shrublands, openings, disturbed areas Spring, summer
Peritoma serrulata
Rocky
Mountain
Bee Plant
Cleomaceae Cleome Pink Foothills, montane Roadsides, disturbed areas Summer, fall
Persicaria amphibia Water Smartweed Polygonaceae Buckwheat Pink Montane Lake edge Summer
Petradoria pumila Rock Goldenrod Asteraceae Sunflower Yellow Foothills Roadsides, woodlands, openings Summer
Petrophyton caespitosum Rockmat Rosaceae Rose White Semi-desert Canyons Summer, fall
Phacelia bakeri Baker's Phacelia Boraginaceae
formerly
Hydrophyllaceae
Forget
Me-Not
formerly
Waterleaf
Blue Subalpine, alpine Rocky openings Summer
Phacelia crenulata Phacelia Boraginaceae
formerly
Hydrophyllaceae
Forget
Me-Not
formerly
Waterleaf
Blue Semi-desert Canyons, openings, sand Spring
Phacelia glandulosa
var.
glandulosa
Glandular Phacelia Boraginaceae
formerly
Hydrophyllaceae
Forget
Me-Not
formerly
Waterleaf
Blue Foothills,
montane
Rocky slopes,
hillsides
Summer
Phacelia heterophylla   Boraginaceae
formerly
Hydrophyllaceae
Forget
Me-Not
formerly
Waterleaf
White Foothills, montane Woodlands, openings Spring, summer
Phacelia integrifolia   Boraginaceae
formerly
Hydrophyllaceae
Forget
Me-Not
formerly
Waterleaf
White Semi-desert Sand, woodlands Spring
Phacelia ivesiana
var.
ivesiana
  Boraginaceae
formerly
Hydrophyllaceae
Forget
Me-Not
formerly
Waterleaf
White Semi-desert Sand, woodlands Spring,
summer
Phacelia sericea Silky Phacelia Boraginaceae
formerly
Hydrophyllaceae
Forget
Me-Not
formerly
Waterleaf
Purple Subalpine, alpine Meadows, openings, tundra Summer
Phemeranthus brevifolius   Montiaceae
formerly
Portulacaceae
Miner's Lettuce
formerly
Purslane
Pink Semi-desert
Rock depressions
Spring
Philadelphus microphyllus Mock Orange Hydrangeaceae Hydrangea White Semi-desert, foothills Woodlands, openings Early summer
Phlox austromontana Phlox Polemoniaceae Phlox White Semi-desert, foothills Canyons, shrublands Spring
Phlox condensata Alpine Phlox Polemoniaceae Phlox White Alpine Meadows, tundra, rocks Summer
Phlox hoodii ssp. canescens Phlox Polemoniaceae Phlox White Semi-desert, foothills Canyons, shrublands Spring
Phlox longifolia Phlox Polemoniaceae Phlox Pink/White Semi-desert, foothills Openings, shrublands Spring,
summer
Phlox multiflora Phlox Polemoniaceae Phlox Pink/White Foothills Openings, shrublands Spring,
summer
Phoradendron juniperinum Juniper Mistletoe Santalaceae Sandalwood Yellow Foothills,
Montane
Woodlands Spring,
summer
Physaria acutifolia Double  Bladderpod Brassicaceae Mustard Yellow Semi-desert, foothills Shrublands, woodlands, openings Spring
Physaria fendleri Bladderpod Brassicaceae Mustard Yellow Semi-desert Sand areas, shrublands Spring
Physaria pulvinata Bladderpod Brassicaceae Mustard Yellow Foothills Meadows Spring, summer
Physaria rectipes Bladderpod Brassicaceae Mustard Yellow Semi-desert, foothills Woodlands Spring
Physaria scrotiformis Bladderpod Brassicaceae Mustard Yellow Alpine Tundra Summer
Picea engelmannii Engelmann Spruce Pinaceae Pine Tree Montane, subalpine, alpine Woodlands Spring
Picea pungens Colorado
Blue Spruce
Pinaceae Pine Tree Montane, subalpine Woodlands Spring
Picrothamnus desertorum Spiny Sagebrush Asteraceae Sunflower Yellow Semi-desert Openings Spring
Pinus contorta var. latifolia Lodgepole Pine Pinaceae Pine Tree Montane, subalpine Woodlands Summer
Pinus edulis Pinyon Pine Pinaceae Pine Tree Semi-desert, foothills Woodlands Spring
Pinus flexilis Limber Pine Pinaceae Pine Tree Montane,sub-alpine Woodlands Summer
Pinus ponderosa
var.
scopulorum
Ponderosa Pine Pinaceae Pine Tree Foothills, montane Woodlands Spring
Plagiobothrys hispidulus   Boraginaceae Forget-
Me-Not
White Foothills, montane Moist meadows, pond edges, openings Spring,
summer
Plagiobothrys scouleri   Boraginaceae Forget-
Me-Not
White Foothills, montane Moist meadows, pond edges, openings Spring,
summer
Plantago eriopoda Plantain Plantaginaceae Plantain White Foothills, montane Openings Spring, summer
Plantago patagonica Woolly Plantain Plantaginaceae Plantain White Semi-desert, foothills Openings, canyons Spring, summer
Platanthera spp.   Orchidaceae Orchid Green      
Platyschkuhria integrifolia
variety oblongifolia
  Asteraceae Sunflower Yellow Semi-desert Openings, hills Spring, summer,
fall
Pneumonanthe affinis Bottle Gentian Gentianaceae Gentian Blue Montane, subalpine, alpine Wet meadows Summer
Pneumonanthe parryi Mountain Gentian Gentianaceae Gentian Blue Subalpine, alpine Meadows, openings Summer, fall
Podistera eastwoodiae   Apiaceae Parsley Yellow Subalpine Meadows, woodlands Summer
Polemonium confertum Sky Pilot Polemoniaceae Phlox Purple Alpine Tundra, scree Summer
Polemonium foliosissimum
var.
foliosissimum
Jacobsladder Polemoniaceae Phlox Blue Montane, subalpine Meadows Summer
Polemonium pulcherrimum
ssp.
delicatum
Jacobsladder Polemoniaceae Phlox Blue Montane, subalpine Woodlands Summer
Polemonium viscosum Sky Pilot Polemoniaceae Phlox Purple Alpine Tundra, scree Summer
Poliomintha incana   Lamiaceae Mint Blue Semi-desert Sand Spring
Polygala subspinosa Milkwort Polygalaceae Milkwort Pink Semi-desert Sand, gravel Spring
Polypodium hesperium Western Polypody Polypodiaceae Western
Polypody
Fern Montane Rocks Summer
Polystichum lonchitis Holly Fern Dryopteridaceae Shield Fern Fern Montane to alpine Rocks Summer
Populus alba Silver Poplar Salicaceae Willow Tree Foothills Roadsides, moist areas Spring
Populus angustifolia Narrowleaf Cottonwood Salicaceae Willow Tree Foothills, montane, subalpine Streamsides Spring
Populus deltoides
ssp. wislizeni
and ssp. fremontii
Cottonwood Salicaceae Willow Tree Semi-deserts, foothills Canyons, washes, streamsides Spring
Populus nigra Lombardy Poplar Salicaceae Willow Tree Foothills Farmlands, lawns Spring
Populus tremuloides Aspen Salicaceae Willow Tree Montane, subalpine Woodlands Spring
Portulaca oleracea Purslane Portulacaceae Portulaca Yellow Foothills Fields, lawns, disturbed areas Summer
Potentilla concinna Cinquefoil Rosaceae Rose Yellow Foothills to alpine Openings, woodlands Summer
Potentilla gracilis Cinquefoil Rosaceae Rose Yellow Montane, subalpine  Meadows, openings Summer
Potentilla hippiana
var.
hippiana
Cinquefoil Rosaceae Rose Yellow Montane Meadows, woodlands Summer
Potentilla nivea Snow Cinquefoil Rosaceae Rose Yellow Alpine Tundra Summer
Potentilla pensylvanica
var.
pensylvanica
Cinquefoil Rosaceae Rose Yellow Foothills to subalpine  Meadows, rocky openings Summer
Potentilla plattensis Cinquefoil Rosaceae Rose Yellow Montane  Moist meadows Summer
Potentilla pulcherrima Cinquefoil Rosaceae Rose Yellow Montane, subalpine  Meadows, openings Summer
Potentilla rubricaulis Cinquefoil Rosaceae Rose Yellow Alpine  Scree, gravel Summer
Poterium sanguisorba
subspecies muricatum
Burnet Rosaceae Rose Red Foothills, montane  Shrublands, meadows Summer
Primula parryi Parry's Primrose Primulaceae Primrose Pink Alpine, subalpine Streamsides, wetlands Summer
Primula specuicola Alcove Primrose Primulaceae Primrose Blue/Pink      
Prosartes trachycarpa Fairybells Liliaceae Bellwort White Montane, subalpine Woodlands Spring, summer
Prunella vulgaris Self-heal Lamiaceae Mint Purple Montane, subalpine Woodlands, meadows Summer
Prunus virginiana Chokecherry Rosaceae Rose White Foothills, montane Shrublands, woodlands Spring
Pseudocymopterus
montanus
Mountain Parsley Apiaceae Parsley Yellow Foothills, montane, subalpine Woodlands, meadows Spring, summer
Pseudostellaria
jamesiana
Tuber Starwort Caryophyllaceae Pink White Foothills, montane Woodlands, openings Summer
Pseudotsuga menziesii
var.
glauca
Douglas Fir Pinaceae Pine Tree Foothills, montane, subalpine Woodlands Spring
Psilochenia intermedia   Asteraceae Sunflower Yellow Foothills Openings, woodlands Spring, summer
Psilochenia occidentalis   Asteraceae Sunflower Yellow Foothills Openings, woodlands Spring, summer
Psilochenia runcinata   Asteraceae Sunflower Yellow Montane Wet meadows Summer
Psilostrophe sparsiflora Paper Flower Asteraceae Sunflower Yellow Semi-desert Pinyon/Juniper woodlands, shrublands Summer, fall
Psychrophila leptosepala Marsh Marigold Ranunculaceae Hellebore White Subalpine Wetlands, openings, meadows Spring, summer
Pteridium aquilinum Bracken Fern Dennstaedtiaceae Bracken Fern Montane, subalpine Woodlands, openings Spring
Pterogonum alatum Winged Buckwheat Polygonaceae Buckwheat Yellow Semi-desert, foothills, montane Openings, shrublands, canyons, woodlands. Spring, summer
Pterospora
andromedea
Pinedrops Ericaceae
formerly
Monotropaceae
Heath
formerly
Pinesap
Brown Montane Woodlands Spring
Pulsatilla ludoviciana Pasqueflower Ranunculaceae Buttercup Violet Foothills - sub-alpine Woodlands, openings Early spring
Pulsatilla patens
ssp.
multifida
Pasqueflower Ranunculaceae Buttercup Violet Foothills - sub-alpine Woodlands, openings Early spring
Purshia stansburiana Cliff Rose Rosaceae Rose White Semi-desert, foothills Woodlands, shrublands, openings Spring
Purshia tridentata Buckbrush Rosaceae Rose White Semi-desert, foothills Woodlands, shrublands, openings Spring
Pyrola asarifolia
ssp.
asarifolia
Pyrola Ericaceae
formerly
Pyrolaceae
Heath
formerly
Pyrola
Pink Montane, sub-alpine Wet woodlands, meadows, streamsides Summer
Pyrola chlorantha Pyrola Ericaceae
formerly
Pyrolaceae
Heath
formerly
Pyrola
Green Montane Woodlands Summer
Pyrola minor Pyrola Ericaceae
formerly
Pyrolaceae
Heath
formerly
Pyrola
White Montane, subalpine Woodlands Summer
Pyrola picta Pyrola Ericaceae
formerly
Pyrolaceae
Heath
formerly
Pyrola
Green Montane Woodlands Summer
Pyrola rotundifolia Pyrola Ericaceae
formerly
Pyrolaceae
Heath
formerly
Pyrola
Pink Montane, sub-alpine Wet woodlands, meadows, streamsides Summer
Pyrrocoma crocea
var. crocea
  Asteraceae Sunflower Yellow Montane Meadows, woodlands Summer

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