Flora of North America species comparison

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Astragalus accidens var. hendersonii

Astragalus accidens var. accidens
Photo is of parent taxon

Henderson's milk vetch
Photo is of parent taxon

Rogue River milkvetch
Leaflets

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

23–29, blade surfaces glabrous adaxially.
Peduncles

7–15 cm, usually slightly longer than leaves.

4.5–10.5 cm, often equaling leaf.
Legumes

16–25 × 8–12 mm, glabrous;

stipe ± stout, 6–12 mm.

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

stipe slender, 5–8 mm.
2n

= 26.

Astragalus accidens var. hendersonii

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

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

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

(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. accidens
A. accidens var. hendersonii
Synonyms A. hendersonii, A. cymatodes, A. pruniformis, A. watsonii, Hesperonix watsonii
Name authority M. E. Jones: Rev. N.-Amer. Astragalus, 164. (1923) — (as hendersoni) unknown
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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