Flora of North America species comparison

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Astragalus amphioxys var. amphioxys

Astragalus amphioxys var. musimonum
Photo is of parent taxon

crescent milkvetch
Photo is of parent taxon

crescent milkvetch, sheep mountain 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.

calyx campanulate, tube 3.4–4.8 mm, lobes 1.8–2.5 mm;

corolla banner 10.3–13.4 mm;

keel 8–11.5 mm.
Legumes

15–40 mm, curved.

15–20(–25) mm, crescentic or incurved through 1/2 their length.
Seeds

(42–)44–56.

26–36.
2n

= 22.

Astragalus amphioxys var. amphioxys

Astragalus amphioxys var. musimonum
Phenology Flowering late Mar–Jun. Flowering Apr–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. Limestone gravel and outcrops with blackbrush.
Elevation 400–2100 m. (1300–6900 ft.) 1100–1800 m. (3600–5900 ft.)
Distribution
from FNA
AZ; CO; NM; NV; TX; UT; Mexico (Chihuahua)
[BONAP county map]
from FNA
AZ; NV
[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.)

Variety musimonum is found on the Shivwits Plateau in Mohave County, Arizona, westward to the Sheep Mountain Range in Clark County, Nevada.

The combination of a sharply curved tip of the fruit, short petal claws, and small calyx has been considered sufficient to recognize this taxon as a distinct species, Astragalus musimonum (D. Isely 1998).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Argophylli > Astragalus amphioxys Fabaceae > subfam. Faboideae > Astragalus > sect. Argophylli > Astragalus amphioxys
Sibling taxa
A. amphioxys var. modestus, A. amphioxys var. musimonum, A. amphioxys var. vespertinus
A. amphioxys var. amphioxys, A. amphioxys var. modestus, A. amphioxys var. vespertinus
Synonyms A. musimonum
Name authority unknown (Barneby) Barneby in A. Cronquist et al.: Intermount. Fl. 3(B): 138. (1989)
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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