Raillardella scaposa

(A. Gray) A. Gray in W. H. Brewer et al.
in W. H. Brewer et al., Bot. California 1: 417. 1876.
Basionym: Railliardia scaposa A. Gray Proc. Amer. Acad. Arts 6: 551. 1865 (as Raillardia)
Treatment appears in FNA Volume 21. Treatment on page 257.

Plants 6–53 cm. Leaf blades lanceolate or oblanceolate to linear, margins entire, faces stipitate-glandular, sometimes sparsely scabrellous as well. Ray florets 0 or 1–7; corollas yellow to yellow-orange, laminae 5–25+ mm. Disc florets 7–44; corollas yellow to yellow-orange, 7.5–12 mm. 2n = 68, 70.

Phenology: Flowering Jun–Sep.
Habitat: Wet to dry, often sandy sites
Elevation: 2000–3500 m


Variation among populations of Raillardella scaposa spans the morphologic and ecologic divide between R. argentea and R. pringlei; R. scaposa is evidently an allopolyploid that descended from ancestors closely related to each of the other two species. Raillardella scaposa is widely distributed in the Sierra Nevada and southern Cascade Range, often near populations of R. argentea. Putative hybrids between R. scaposa and R. argentea have been noted (e.g., R. Snow 293, UC, from Tuolumne County, California).

Selected References


Lower Taxa


... more about "Raillardella scaposa"
Bruce G. Baldwin +  and John L. Strother +
(A. Gray) A. Gray in W. H. Brewer et al. +
Railliardia scaposa +
Calif. +, Nev. +  and Oreg. +
2000–3500 m +
Wet to dry, often sandy sites +
Flowering Jun–Sep. +
in W. H. Brewer et al., Bot. California +
Compositae +
Raillardella scaposa +
Raillardella +
species +