Chorizanthe cuspidata var. cuspidata

Common names: San Francisco spineflower
EndemicConservation concern
Treatment appears in FNA Volume 5. Treatment on page 454. Mentioned on page 455.
Revision as of 22:15, 5 November 2020 by imported>Volume Importer
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Plants decumbent to prostrate, 0.5–1.5 × 0.5–10 dm. Leaf blades 0.5–2(–2.5) × 0.3–0.7 cm. Involucres 1–2 mm, with or without pinkish, thin, scarious margins, awns uncinate apically. Flowers 2–2.5 mm. Achenes 2–2.5 mm.


Phenology: Flowering Apr–Jul.
Habitat: Sandy places, coastal scrub communities, oak woodlands
Elevation: 0-300 m

Discussion

Of conservation concern.

Variety cuspidata is localized in the greater San Francisco area, where it is rapidly becoming rare due to increased development. No collections of San Francisco spineflower have been made in Marin or Alameda counties since 1881. Populations may still be seen in San Mateo County, but their numbers have decreased greatly since the 1950s.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
S. Watson +
San Francisco spineflower +
0-300 m +
Sandy places, coastal scrub communities, oak woodlands +
Flowering Apr–Jul. +
Proc. Amer. Acad. Arts +
Endemic +  and Conservation concern +
Chorizanthe pungens var. cuspidata +
Chorizanthe cuspidata var. cuspidata +
Chorizanthe cuspidata +
variety +