Flora of North America species comparison

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Astragalus hallii var. hallii

Astragalus sect. Scytocarpi
Photo is of parent taxon

Hall's milkvetch
Habit Herbs perennial, caulescent; caudex subterranean.
Herbage

usually green, rarely subcinereous, villosulous or loosely strigulose, hairs to 0.5–0.8(–1) mm.

Stems

decumbent or prostrate with ascending tips.

single or few to many.
Leaves

odd-pinnate, subsessile to petiolate;

leaflets (3–)7–25(–31), sometimes decurrent.
Leaflets

(13–)19–27(–31).

Racemes

loosely flowered, flowers ascending, spreading, or declined.
Peduncles

usually ascending, spreading, or declined, rarely prostrate (in fruit).

Corollas

purple or reddish violet.

purple to pink or pink-purple, purplish, ochroleucous, yellowish, or whitish, banner recurved through 45–90°, keel apex obtuse or acute-triangular.
Calyx

tubes shallowly to deeply campanulate or subcylindric.
Legumes

humistrate, narrowly oblong-ellipsoid, oblanceoloid-ellipsoid, or subclavately ellipsoid, not distinctly inflated, (12–)13–24(–27) × (3–)4–7(–8.5) mm, glabrous or sparsely strigulose;

stipe 1–2 mm.

persistent, sessile or subsessile to stipitate, spreading to declined, deflexed, or pendulous, oblong, ellipsoid, subglobose, or cylindroid, sometimes bladdery-inflated, 3-sided, subterete, or compression lateral or dorsiventral, unilocular.
Seeds

20–30.

4–36.
Hairs

basifixed.
Stipules

connate at proximal nodes, distinct ± distally.
2n

= 22.

Astragalus hallii var. hallii

Astragalus sect. Scytocarpi
Phenology Flowering Jun–Sep.
Habitat Hillsides, meadows, sagebrush communities, mixed conifer-aspen communities.
Elevation 2300–3100 m. (7500–10200 ft.)
Distribution
from FNA
AZ; CO; NM; OK
[BONAP county map]
w North America; Mexico; c North America
Discussion

Variety hallii occurs in central, south-central, and southwestern Colorado, north-central and northwestern New Mexico, and just into Arizona (Apache County), and is disjunct in Oklahoma (Cimarron County).

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

Species 14 (13 in the flora).

In the flora area, sect. Scytocarpi consists of 13 species in six subsections found on the Great Plains, Rocky Mountains, and Colorado Basin, southward through Arizona, New Mexico, trans-Pecos Texas, and northeastern Mexico; one other subsection is found only in northeastern Mexico.

The subsections are: subsect. Scytocarpi (A. Gray) Barneby (Astragalus flexuosus, A. fucatus, A. pictiformis, A. proximus, and A. subcinereus); subsect. Wingatani Barneby (A. cliffordii and A. wingatanus); subsect. Microlobi (A. Gray) Barneby (A. gracilis); subsect. Microcymbi S. L. Welsh (A. microcymbus); subsect. Halliani (Rydberg) Barneby (A. castetteri, A. hallii, and A. puniceus); subsect. Shevockiani Barneby (A. shevockii); and subsect. Antonini Barneby (A. coriaceus Hemsley), which is confined to Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Scytocarpi > Astragalus hallii Fabaceae > subfam. Faboideae > Astragalus
Sibling taxa
A. hallii var. fallax
Subordinate taxa
Name authority unknown A. Gray: Proc. Amer. Acad. Arts 6: 222. (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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