Thomas Nuttall collected the first specimen of Machaeranthera grindelioides in Oregon on the Wyeth Expedition of 1834-1837.  Nuttall named the plant Eriocarpum grindelioides in 1841, and the plant went through several name changes over the next century until Lloyd Shinners (1918-1971) placed it in the  Machaeranthera genus as M. grindelioides in 1950/  In 2003 Morgan and Hartman moved it to its present genus, Xanthisma.

    Xanthisma is from the Greek "xanth" meaning "yellow".

Semi-desert. Openings, rimrock sands and gravels. Spring.
Canyons of the Ancients National Monument, May 15, 2006.

Xanthisma grindelioides probably attracts more attention with its needle-toothed leaves (see next photographs) than with its small, ray-less flowers (see last photograph).  The plant thrives in hot, dry, open areas where it grows in small clumps with last year's dead growth forming a gray skirt around it.

"Machaer" is Greek for "sword" and "anthera" is Greek for "anthers" from "anthos", "flower".  "Machaeranthera" thus refers to the sword shape of the anther tips.  David Hieronymus Grindel was a Russian (Latvian) chemist, pharmacist, and doctor.  "Grindelioides" means, "similar to the genus Grindelia".  See Grindelia.  (More biographical information.)

Semi-desert. Openings, rimrock sands and gravels. Spring.
Canyons of the Ancients National Monument, May 15, 2006 and October 19, 2007.

Semi-desert. Openings, rimrock sands and gravels. Spring.
Canyons of the Ancients National Monument, May 15, 2006 and May 17, 2009.

The top photograph shows a flower noticeably fresher than the flower in the bottom photograph.  Notice that the phyllaries have tiny glistening dots -- best observed on the bottom flower along the sunlit edge.  S and particles are trapped by the sticky.

Flattened, long, yellow styles protrude from the top of the flower head.

Semi-desert. Openings, rimrock sands and gravels. Spring.
Canyons of the Ancients National Monument, January 5, 2012.

A low winter sun illuminates Xanthisma grindelioides.

Range map © John Kartesz,
Floristic Synthesis of North America

State Color KeySpecies present in state and native
Species present in state and exotic
Species not present in state

County Color Key

Species present and not rare
Species present and rare
Species extirpated (historic)
Species extinct
Species noxious
Species exotic and present
Native species, but adventive in state
Eradicated
Questionable presence

Range map for Xanthisma grindelioides