Chorizanthe polygonoides var. polygonoides

Common names: Knotweed spineflower
Endemic
Synonyms: Acanthogonum polygonoides (Torrey & A. Gray) Goodman
Treatment appears in FNA Volume 5. Treatment on page 466.

Plants generally greenish. Invo-lucres 2–2.5 mm; prominent teeth with awns 1.5–2 mm. 2n = 40.


Phenology: Flowering Apr–Jun.
Habitat: Sandy to gravelly mostly volcanic soils, mixed grassland communities, oak-pine or montane conifer woodlands
Elevation: 100-1500 m

Discussion

Variety polygonoides occurs from Modoc County to Calaveras County in the Sierra Nevada, in the Sacramento Valley, and in the Coast Ranges from Lake County to Santa Barbara County. In San Luis Obispo and Monterey counties, knotweed spineflower is on sandstones or conglomerates rather than volcanic substrates. All populations are widely scattered and the plants are mostly rare to infrequent.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
Torrey & A. Gray +
Undefined sect. Acanthogonum +
Knotweed spineflower +
100-1500 m +
Sandy to gravelly mostly volcanic soils, mixed grassland communities, oak-pine or montane conifer woodlands +
Flowering Apr–Jun. +
Proc. Amer. Acad. Arts +
Acanthogonum polygonoides +
Chorizanthe polygonoides var. polygonoides +
Chorizanthe polygonoides +
variety +