Flora of North America species comparison

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Astragalus sparsiflorus var. sparsiflorus
Photo is of parent taxon

Front Range milkvetch
Leaves

1.5–5 cm;

leaflets 9–15, blades broadly elliptic, obovate, or suborbiculate, 2–7 mm.
Racemes

(1 or)2–6-flowered;

axis (0–)1.5–2.5 cm in fruit.
Flowers

calyx 3–3.5 mm, tube 1.5–1.9 × 1.6–2 mm, lobes 1.5–2 mm;

corolla banner recurved through 90°, 5.5–6.6 mm.
Legumes

purplish-tinged or -mottled, obliquely semi-ovoid, carinate ventrally by the concavely arched suture, openly sulcate dorsally in proximal 1/2–2/3, (5–)6–8 × 2.7–4 mm, contracted distally into a broadly triangular, laterally flattened beak;

septum very narrow or obsolete, to 0.2 mm wide.
Pubescence

sometimes copious.

Astragalus sparsiflorus var. sparsiflorus
Phenology Flowering late May–Aug.
Habitat Dry gravelly banks, open hillsides, sandy canyon bottoms, roadcuts, natural talus, on loose granitic sand or gravel.
Elevation 1600–3000 m. (5200–9800 ft.)
Distribution
from FNA
CO
[BONAP county map]
Discussion

Variety sparsiflorus is known from the upper canyon of the South Platte River, southward through the foothills of Pike’s Peak to the upper Arkansas River, in Denver, El Paso, Fremont, Park, and Teller counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Inflati > Astragalus sparsiflorus
Sibling taxa
A. sparsiflorus var. majusculus
Name authority 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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