Flora of North America species comparison

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Astragalus nuttallianus var. austrinus
Photo is of parent taxon

rio fronteras milkvetch, smallflower milkvetch, southern small flower milk vetch
Habit Plants strigulose or hirsutulous.
Stems

(1–)3–25(–35) cm.
Leaves

1–6.5 cm;

leaflets 7–11(–17), blades often narrowly elliptic, sometimes broader proximally, apex rounded.
Racemes

(1–)2–5(–8)-flowered;

axis very short in fruit.
Peduncles

3–10 cm.
Flowers

calyx 3.7–5.4 mm, silvery-pilose, tube (1.5–)2–3 mm, lobes 1.8–2.1 mm;

corolla white or tipped pink or purple, banner (4–)5.5–7 mm;

keel apex triangular-acute or sharply deltate, usually beaklike.
Legumes

13–24 × 1.8–2.8(–3) mm, glabrous or strigulose.
Seeds

14–18.
2n

= 24.

Astragalus nuttallianus var. austrinus
Phenology Flowering Mar–May (summer–fall).
Habitat On limestone substrates, in various vegetative types.
Elevation 600–2200 m. (2000–7200 ft.)
Distribution
from FNA
AZ; CA; CO; KS; NM; OK; TX; Mexico (Baja California, Chihuahua, Coahuila, Durango, Nuevo León, Puebla, Sonora)
[BONAP county map]
Discussion

Variety austrinus occurs from southern Kansas to the southern tip of Texas and northern Mexico, and westward to Arizona and southern California, where it grades into var. imperfectus (D. Isely 1998).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Leptocarpi > Astragalus nuttallianus
Sibling taxa
A. nuttallianus var. cedrosensis, A. nuttallianus var. imperfectus, A. nuttallianus var. macilentus, A. nuttallianus var. micranthiformis, A. nuttallianus var. nuttallianus, A. nuttallianus var. pleianthus, A. nuttallianus var. trichocarpus, A. nuttallianus var. zapatanus
Synonyms Hamosa austrina, A. austrinus
Name authority (Small) Barneby in F. Shreve and I. L. Wiggins: Veg. Fl. Sonoran Desert, 709. (1964)
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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