Astragalus nuttallianus var. zapatanus
Astragalus nuttallianus var. austrinus
loredo milkvetch, turkeypeas
rio fronteras milkvetch, smallflower milkvetch, southern small flower milk vetch
2–30 cm.
(1–)3–25(–35) cm.
1.5–4.5(–5) cm;
leaflets (7 or)9–17, blades narrowly cuneate to oblong, oval, or oblong-cuneate, apex retuse or deeply emarginate.
1–6.5 cm;
leaflets 7–11(–17), blades often narrowly elliptic, sometimes broader proximally, apex rounded.
1–4-flowered;
axis very short in fruit.
(1–)2–5(–8)-flowered;
axis very short in fruit.
(0.2–)0.5–4.5 cm.
3–10 cm.
calyx 3–4.6 mm, pilosulous, tube 1.6–2.7 mm, lobes 1.5–2.1 mm;
corolla banner (4–)4.9–6.7 mm;
keel apex triangular, slightly beaklike.
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.
13–18 × 2.6–3.2 mm, loosely strigulose.
13–24 × 1.8–2.8(–3) mm, glabrous or strigulose.
10–16.
14–18.
= 24.
Astragalus nuttallianus var. zapatanus
Astragalus nuttallianus var. austrinus
Variety zapatanus occurs in the lower Rio Grande Valley from Laredo to the Gulf Coast and into northeastern Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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