Cirsium remotifolium var. rivulare

Jepson

Man. Fl. Pl. Calif., 1164. 1925.

Common names: Klamath thistle
Endemic
Synonyms: Cirsium acanthodontum S. F. Blake Cirsium oreganum Piper
Treatment appears in FNA Volume 19. Treatment on page 131. Mentioned on page 130, 147.

Phyllaries imbricate or subequal, linear, margins and/or apices regularly spinulose-serrulate, sometimes weakly expanded and scarious. Corollas usually purple (infrequently cream-colored), 20–25 mm, tubes 8–12 mm, throats 5–6 mm, lobes 6–8 mm. 2n = 32.


Phenology: Flowering late spring–summer (May–Aug).
Habitat: Sea bluffs, river valleys, meadows, grasslands, open coniferous or mixed coniferous-hardwood forests
Elevation: 10–1200 m

Discussion

Plants of var. rivulare occur in the western Klamath Mountains of southwestern Oregon and northwestern California and the adjacent coastal plain. Although these plants are usually slender and erect with well separated leaves, they assume a compact growth form in maritime habitats.

Selected References

None.

Lower Taxa

None.
David J. Keil +
Jepson +
Carduus remotifolius +
Klamath thistle +
Calif. +  and Oreg. +
10–1200 m +
Sea bluffs, river valleys, meadows, grasslands, open coniferous or mixed coniferous-hardwood forests +
Flowering late spring–summer (May–Aug). +
Man. Fl. Pl. Calif., +
Cirsium acanthodontum +  and Cirsium oreganum +
Cirsium remotifolium var. rivulare +
Cirsium remotifolium +
variety +