Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. trichocarpus
small milkvetch, turkeypeas
hairypod milkvetch, turkeypeas
8–30(–38) cm.
10–30(–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 11 or 13, blades broadly elliptic, apex subacute or obtuse, rarely emarginate proximally.
(2 or)3–27-flowered;
axis to (0.5–)1–3 cm in fruit.
(1–)3–6-flowered;
axis very short in fruit.
2.5–9 cm.
longer or shorter than leaves.
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 4–5.4 mm, hirsutulous, tube 2–3 mm, lobes 1.8–2.1 mm;
corolla banner (4–)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, hirsutulous.
12–22.
14–18.
Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. trichocarpus
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 trichocarpus is widespread in eastern and southern Texas, but is not clearly distinguished from var. austrinus where their ranges overlap (R. C. Barneby 1964).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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