Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. zapatanus
small milkvetch, turkeypeas
loredo milkvetch, turkeypeas
8–30(–38) cm.
2–30 cm.
(1.5–)2–9.5 cm;
leaflets 7–23, blades sometimes dimorphic, distal ones more narrow, linear-elliptic, oblong-oblanceolate, broadly elliptic, or obovate, apex acute or truncate-emarginate.
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.
(2 or)3–27-flowered;
axis to (0.5–)1–3 cm in fruit.
1–4-flowered;
axis very short in fruit.
2.5–9 cm.
(0.2–)0.5–4.5 cm.
calyx 3.4–5.6 mm, loosely sparsely strigulose-pilosulous, tube 2–3.1 mm, lobes 1.1–3 mm;
corolla banner (6.4–)8.5–13 mm;
keel apex obtusely rounded.
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.
(10–)13–25 × 1.8–2.7 mm, glabrous;
substipitate.
13–18 × 2.6–3.2 mm, loosely strigulose.
12–22.
10–16.
Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. zapatanus
Variety macilentus occurs from south-central Texas to the western tip of the state. Species level recognition may be justified because of its elongating inflorescences, substipitate fruits, obtuse keels, and absence of intergradation with sympatric Astragalus nuttallianus (D. Isely 1998). It is easily confused with A. emoryanus in flower, which is distinguished by its sessile and deciduous fruits.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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