Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. nuttallianus
small milkvetch, turkeypeas
smallflower milkvetch
8–30(–38) cm.
(2–)5–30(–40) 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.
2–6(–7.5) cm;
leaflets (7–)11–19(–23), blades linear-oblong, oblong, oblong-cuneate, ovate-cuneate, or obcordate, apex retuse to truncate-emarginate.
(2 or)3–27-flowered;
axis to (0.5–)1–3 cm in fruit.
(1 or)2–6(or 7)-flowered;
axis to 0.8(–1) cm in fruit.
2.5–9 cm.
2–7(–8.5) 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 (3.5–)3.7–5.4 mm, sparsely strigulose, tube 1.3–2.4 mm, lobes (1.7–)1.9–3.2 mm;
corolla banner (4.3–)4.8–7.3 mm;
keel apex triangular-acute or sharply deltate, erect or beaklike.
(10–)13–25 × 1.8–2.7 mm, glabrous;
substipitate.
(12–)16–26 × (2–)2.4–3.5 mm, glabrous.
12–22.
10–16.
= 22.
Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. nuttallianus
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 nuttallianus is the common phase of the species in Oklahoma and central Texas. The Alabama occurrence is thought to be a recent introduction (B. R. Keener 2013).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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