Flora of North America species comparison

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Astragalus amphioxys var. modestus

Astragalus sect. Argophylli
Photo is of parent taxon

crescent milkvetch, modest milkvetch
Habit Herbs perennial (sometimes flowering as annual), usually tuft- or mat-forming, acaulescent, subacaulescent, or caulescent; caudex usually superficial or aerial, sometimes subterranean.
Stems

(when present) obsolete, single, few, or several to many.
Leaves

odd-pinnate, usually petiolate, rarely short-petiolate or subsessile;

leaflets (1 or)3–39(–43).
Racemes

subcapitate to loosely flowered, flowers erect, ascending, spreading, declined, or nodding, secund, and retrorsely imbricate.
Flowers

calyx cylindro-campanulate, tube 6.1–9.3 mm, lobes 1.1–2.6 mm;

corolla banner 12.8–16 mm;

keel 11–12.7 mm.

Corollas

purple, pink-purple, magenta-purple, violet, bluish, lilac, scarlet, ochroleucous, greenish white, or white, banner barely recurved (A. phoenix) or recurved through 20–50° (90–100° in A. accumbens), keel apex obtuse.
Calyx

tubes cylindric or deeply campanulate.
Legumes

16–40 mm, crescentic or incurved through 1/2 their length.

usually deciduous, usually sessile, rarely subsessile or substipitate, gynophore sometimes present, usually ascending (humistrate), less often spreading or pendulous, subglobose to ellipsoid, narrowly lanceoloid, ovoid or oblong-ellipsoid, or lanceoloid-ovoid, straight or usually incurved, usually compressed dorsiventrally, sometimes obcompressed, 3-sided, turgid, or inflated, unilocular, subunilocular, or bilocular.
Seeds

44–58.

11–70.
Hairs

basifixed or malpighian.
Stipules

distinct (except anomalous forms of A. missouriensis, A. tephrodes, and A. zionis).

Astragalus amphioxys var. modestus

Astragalus sect. Argophylli
Phenology Flowering Mar–May.
Habitat Dry gravelly hillsides, in blackbrush, four-wing saltbush, Indian ricegrass, needle-and-thread grass, old man sagebrush, mixed grass communities, on sandy silt, limestone, or cindery volcanic debris.
Elevation 1100–1500 m. (3600–4900 ft.)
Distribution
from FNA
AZ; NV; UT; Dry gravelly hillsides; in blackbrush; four-wing saltbush; Indian ricegrass; needle-and-thread grass; old man sagebrush; mixed grass communities; on sandy silt; limestone; or cindery volcanic debris
[BONAP county map]
w North America; n Mexico
Discussion

The small-flowered var. modestus forms the other major extreme in flower size within the species, contrasting with the large-flowered var. vespertinus. It is local, forming uniform colonies within the range of var. amphioxys but only from valleys affluent to the Colorado River from San Juan and eastern Kane counties, Utah, and northern Mohave County, Arizona, with disjunct populations in Lincoln County, Nevada. Some plants from northeastern Arizona and northwestern New Mexico have similarly small flowers and might represent an eastward extension of var. modestus; however, in this case introgression from Astragalus missouriensis cannot be ruled out.

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

Species 44 (44 in the flora).

Section Argophylli comprises ten subsections, widespread in western North America from southern British Columbia and Saskatchewan southward to northern Baja California, northern Sonora, and western Texas.

The subsections are: subsect. Argophylli (A. Gray) M. E. Jones (Astragalus argophyllus, A. callithrix, A. columbianus, A. cyaneus, A. desereticus, A. eurylobus, A. henrimontanensis, A. iodopetalus, A. piutensis, A. shortianus, A. tephrodes, A. tidestromii, A. uncialis, A. zionis); subsect. Pseudargophylli Barneby (A. feensis, A. waterfallii); subsect. Neomexicani Barneby (A. neomexicanus); subsect. Newberryani M. E. Jones (A. eurekensis, A. loanus, A. musiniensis, A. newberryi, A. phoenix, A. welshii); subsect. Concordi S. L. Welsh (A. concordius); subsect. Coccinei M. E. Jones (A. coccineus); subsect. Eriocarpi (A. Gray) Barneby (A. anserinus, A. funereus, A. inflexus, A. leucolobus, A. nudisiliquus, A. purshii, A. subvestitus, A. utahensis); subsect. Parryani Barneby (A. parryi); subsect. Missourienses M. E. Jones (A. accumbens, A. amphioxys, A. castaneiformis, A. chamaeleuce, A. consobrinus, A. cymboides, A. laccoliticus, A. missouriensis, A. piscator); and subsect. Anisi Barneby (A. anisus).

(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
Sibling taxa
A. amphioxys var. amphioxys, A. amphioxys var. musimonum, A. amphioxys var. vespertinus
Subordinate taxa
Name authority Barneby: Leafl. W. Bot. 9: 89. (1960) A. Gray: Proc. Amer. Acad. Arts 6: 209. (1864)
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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