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loredo milkvetch, turkeypeas

Habit Plants hirsutulous, hairs 0.4–0.8 mm. Herbs annual, biennial, or perennial, caulescent; caudex superficial.
Stems

2–30 cm.

single or few to many.

Leaves

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.

odd-pinnate, petiolate to subsessile;

leaflets (3 or)5–25(or 27).

Racemes

1–4-flowered;

axis very short in fruit.

subumbellate or loosely flowered, flowers ascending, spreading, or declined.

Peduncles

(0.2–)0.5–4.5 cm.

Flowers

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.

Corollas

usually pink-purple, purple or purple-tinged or -tipped, ochroleucous, or lilac, rarely whitish, banner recurved through 20–80°, keel apex acute, round, deltate, or triangular-acuminate, sometimes slightly beaklike.

Calyx

tubes campanulate.

Legumes

13–18 × 2.6–3.2 mm, loosely strigulose.

deciduous, usually sessile, rarely short-stipitate, short gynophore sometimes present, ascending, spreading to declined, incurved-ascending, or pendulous, mostly linear to linear-oblanceoloid, oblong, or crescentic, sometimes 3-sided, rarely ellipsoid or fleshy, straight or incurved, rarely slightly decurved, compressed laterally, slightly 3-sided or subterete, bilocular.

Seeds

10–16.

(2–)4–30.

Hairs

basifixed or malpighian.

Stipules

distinct.

Astragalus nuttallianus var. zapatanus

Astragalus sect. Leptocarpi

Phenology Flowering Feb–Mar.
Habitat Sandy, frequently disturbed sites.
Elevation 0–200 m. (0–700 ft.)
Distribution
from FNA
TX; Mexico (Tamaulipas)
[BONAP county map]
w United States; se United States; n Mexico
Discussion

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.)

Species 24 (18 in the flora).

Section Leptocarpi is complex morphologically, with eight subsections recognized, one of them, subsect. Coahuilani Barneby, occurring only in northern Mexico. The subsections within the flora area are: subsect. Pringleani Barneby (Astragalus nothoxys); subsect. Arizonici Barneby (A. arizonicus); subsect. Mohavenses Barneby (A. albens, A. mohavensis); subsect. Parvi Barneby (A. hypoxylus); subsect. Tricarinati (Rydberg) Barneby (A. bernardinus, A. tricarinatus); subsect. Californici (A. Gray) Barneby (A. acutirostris, A. breweri, A. claranus, A. emoryanus, A. pauperculus, A. rattanii, A. tener); and subsect. Leptocarpi (M. E. Jones) Barneby (A. leptocarpus, A. lindheimeri, A. nuttallianus, A. nyensis).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Leptocarpi > Astragalus nuttallianus Fabaceae > subfam. Faboideae > Astragalus
Sibling taxa
A. nuttallianus var. austrinus, A. nuttallianus var. cedrosensis, A. nuttallianus var. imperfectus, A. nuttallianus var. macilentus, A. nuttallianus var. micranthiformis, A. nuttallianus var. nuttallianus, A. nuttallianus var. pleianthus, A. nuttallianus var. trichocarpus
Subordinate taxa
Name authority Barneby: Field & Lab. 24: 36. (1956) M. E. Jones: Rev. N.-Amer. Astragalus, 266. (1923)
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