Flora of North America species comparison

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Astragalus nuttallianus var. zapatanus

Astragalus nuttallianus var. nuttallianus
Photo is of parent taxon

loredo milkvetch, turkeypeas
Photo is of parent taxon

smallflower milkvetch
Habit Plants hirsutulous, hairs 0.4–0.8 mm. Plants sparsely strigulose, hairs appressed, to 0.6(–0.7) mm.
Stems

2–30 cm.

(2–)5–30(–40) cm.
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.

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.
Racemes

1–4-flowered;

axis very short in fruit.

(1 or)2–6(or 7)-flowered;

axis to 0.8(–1) cm in fruit.
Peduncles

(0.2–)0.5–4.5 cm.

2–7(–8.5) 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.

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.
Legumes

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

(12–)16–26 × (2–)2.4–3.5 mm, glabrous.
Seeds

10–16.

10–16.
2n

= 22.

Astragalus nuttallianus var. zapatanus

Astragalus nuttallianus var. nuttallianus
Phenology Flowering Feb–Mar. Flowering Mar–Jun.
Habitat Sandy, frequently disturbed sites. Prairies, roadsides, open pine or oak woods.
Elevation 0–200 m. (0–700 ft.) 0–700 m. (0–2300 ft.)
Distribution
from FNA
TX; Mexico (Tamaulipas)
[BONAP county map]
from FNA
AL; AR; KS; LA; OK; TX
[BONAP county map]
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.)

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.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Leptocarpi > Astragalus nuttallianus Fabaceae > subfam. Faboideae > Astragalus > sect. Leptocarpi > Astragalus nuttallianus
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
A. nuttallianus var. austrinus, A. nuttallianus var. cedrosensis, A. nuttallianus var. imperfectus, A. nuttallianus var. macilentus, A. nuttallianus var. micranthiformis, A. nuttallianus var. pleianthus, A. nuttallianus var. trichocarpus, A. nuttallianus var. zapatanus
Name authority Barneby: Field & Lab. 24: 36. (1956) unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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