Flora of North America species comparison

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Astragalus accidens var. accidens

Astragalus accidens var. hendersonii
Photo is of parent taxon

Rogue River milkvetch
Photo is of parent taxon

Henderson's milk vetch
Leaflets

23–29, blade surfaces glabrous adaxially.

(15–)19–27, blade surfaces glabrous or sparsely pubescent adaxially.
Peduncles

4.5–10.5 cm, often equaling leaf.

7–15 cm, usually slightly longer than leaves.
Legumes

10–16 × (4–)4.5–7 mm, loosely strigulose;

stipe slender, 5–8 mm.

16–25 × 8–12 mm, glabrous;

stipe ± stout, 6–12 mm.
2n

= 26.

Astragalus accidens var. accidens

Astragalus accidens var. hendersonii
Phenology Flowering late Apr–Jul. Flowering late Apr–Jul.
Habitat Dry sites with oaks, soils derived from litter. Grassy or brushy slopes, open woods, and oak thickets on igneous bedrock.
Elevation 100–800 m. (300–2600 ft.) 200–1300 m. (700–4300 ft.)
Distribution
from FNA
OR
[BONAP county map]
from FNA
CA; OR
[BONAP county map]
Discussion

Variety accidens is restricted to southern Douglas and eastern Josephine counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Pruniformes > Astragalus accidens Fabaceae > subfam. Faboideae > Astragalus > sect. Pruniformes > Astragalus accidens
Sibling taxa
A. accidens var. hendersonii
A. accidens var. accidens
Synonyms A. hendersonii, A. cymatodes, A. pruniformis, A. watsonii, Hesperonix watsonii
Name authority unknown M. E. Jones: Rev. N.-Amer. Astragalus, 164. (1923) — (as hendersoni)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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