Flora of North America species comparison

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Astragalus amphioxys var. amphioxys
Photo is of parent taxon

crescent milkvetch
Flowers

calyx cylindric, tube (5.8–)7–10.5 mm, lobes 1.5–3.7(–4.5) mm;

corolla banner (16.2–)19–24.5 mm;

keel (13.2–)14.3–18.8(–19.6) mm.
Legumes

15–40 mm, curved.
Seeds

(42–)44–56.
2n

= 22.

Astragalus amphioxys var. amphioxys
Phenology Flowering late Mar–Jun.
Habitat Sandy valleys, plains, gravelly hillsides, on dunes, rarely on gumbo-clay flats, in creosote bush, Joshua tree, blackbrush, indigo bush, salt desert shrub, pinyon-juniper, and mountain brush communities.
Elevation 400–2100 m. (1300–6900 ft.)
Distribution
from FNA
AZ; CO; NM; NV; TX; UT; Mexico (Chihuahua)
[BONAP county map]
Discussion

Variety amphioxys is variable and includes elements that may be taxonomically significant (D. Isely 1998).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Argophylli > Astragalus amphioxys
Sibling taxa
A. amphioxys var. modestus, A. amphioxys var. musimonum, A. amphioxys var. vespertinus
Name authority 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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