Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. cedrosensis
small milkvetch, turkeypeas
Cedros Island milkvetch, Cedros milk vetch, 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 cm;
leaflets (5 or)7–11, blades proximally cuneate or obcordate, distally linear-elliptic, apex proximally retuse or emarginate, distally acute.
(2 or)3–27-flowered;
axis to (0.5–)1–3 cm in fruit.
1–3-flowered;
axis 0–2 cm in fruit.
2.5–9 cm.
(0.8–)1.5–8.5 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 1.7–3 mm, strigulose, tube (1–)1.4–1.7 mm, lobes (0.7–)1–1.6 mm;
corolla banner 3.7–6 mm;
keel apex triangular-subacute.
(10–)13–25 × 1.8–2.7 mm, glabrous;
substipitate.
(7–)10–20 × 1.6–2 mm, bilocular or ± unilocular, minutely strigulose.
12–22.
12–16.
= 22.
Astragalus nuttallianus var. macilentus
Astragalus nuttallianus var. cedrosensis
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 cedrosensis occurs on the Sonoran Desert in southern California and southwestern Arizona, and southward into northwestern Mexico. It is characterized in large part by the dimorphic proximal leaves with retuse leaflet apices.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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