familyFabaceae
subfamilyFabaceae subfam. Faboideae
genusAstragalus
sectionAstragalus sect. Pruniformes
speciesAstragalus accidens
Astragalus accidens var. hendersonii
Rev. N.-Amer. Astragalus, 164. 1923. (as hendersoni)
Common names: Henderson’s milkvetch
Endemic
Basionym: Astragalus hendersonii S. Watson Proc. Amer. Acad. Arts 22: 471. 1887
Synonyms: A. cymatodes Greene A. pruniformis M. E. Jones A. watsonii E. Sheldon Hesperonix watsonii (Sheldon) Rydberg
Treatment appears in FNA Volume 11.
Leaflets (15–)19–27, blade surfaces glabrous or sparsely pubescent adaxially. Peduncles 7–15 cm, usually slightly longer than leaves. Legumes 16–25 × 8–12 mm, glabrous; stipe ± stout, 6–12 mm. 2n = 26.
Phenology: Flowering late Apr–Jul.
Habitat: Grassy or brushy slopes, open woods, and oak thickets on igneous bedrock.
Elevation: 200–1300 m.
Discussion
R. C. Barneby (1964) proposed that var. hendersonii, a northwestern California and southwestern Oregon endemic, is ancestral to the typical variety because of the wide dispersion and fragmented distribution of var. hendersonii. Astragalus pacificus E. Sheldon is an illegitimate name that pertains here.
Selected References
None.
Lower Taxa
None.