Astragalus nuttallianus var. zapatanus
Astragalus nuttallianus var. macilentus
loredo milkvetch, turkeypeas
small milkvetch, turkeypeas
2–30 cm.
8–30(–38) 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.
(1.5–)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.
1–4-flowered;
axis very short in fruit.
(2 or)3–27-flowered;
axis to (0.5–)1–3 cm in fruit.
(0.2–)0.5–4.5 cm.
2.5–9 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 3.4–5.6 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.
13–18 × 2.6–3.2 mm, loosely strigulose.
(10–)13–25 × 1.8–2.7 mm, glabrous;
substipitate.
10–16.
12–22.
Astragalus nuttallianus var. zapatanus
Astragalus nuttallianus var. macilentus
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 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.)
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