Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. austrinus
small milkvetch, turkeypeas
rio fronteras milkvetch, smallflower milkvetch, southern small flower milk vetch
8–30(–38) cm.
(1–)3–25(–35) 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.
1–6.5 cm;
leaflets 7–11(–17), blades often narrowly elliptic, sometimes broader proximally, apex rounded.
(2 or)3–27-flowered;
axis to (0.5–)1–3 cm in fruit.
(1–)2–5(–8)-flowered;
axis very short in fruit.
2.5–9 cm.
3–10 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 3.7–5.4 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.
(10–)13–25 × 1.8–2.7 mm, glabrous;
substipitate.
13–24 × 1.8–2.8(–3) mm, glabrous or strigulose.
12–22.
14–18.
= 24.
Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. austrinus
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 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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