Flora of North America species comparison

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Astragalus lentiginosus var. macrolobus
Photo is of parent taxon

west Humboldt milkvetch
Habit Plants perennial (rarely flowering first year), 6–30 cm.
Leaves

4–11 cm;

leaflets (9–)13–19, blades obovate or oblanceolate, 4–20 mm, apex mostly retuse, surfaces strigulose-villosulous, some hairs spreading or sinuous.
Racemes

(8–)12–30-flowered, short and compact in fruit;

axis (2–)3–7(–9) cm in fruit.
Peduncles

2.5–7 cm.
Flowers

9.3–11.3 mm;

calyx (4.5–)5–7.1 mm, tube 3–3.8 mm, lobes (1.5–)2–3.3 mm;

corolla usually whitish, sometimes purple or pink-purple.
Legumes

green, faintly mottled, or stramineous, obliquely ovoid or subglobose, strongly inflated, 15–25 × (6–)8–14 mm, thinly papery, translucent, glabrous or strigulose;

beak 3–7 mm, unilocular.
Seeds

18–26.

Astragalus lentiginosus var. macrolobus
Phenology Flowering Apr–Jul.
Habitat On sand, with sagebrush.
Elevation 1100–1800 m. (3600–5900 ft.)
Distribution
from FNA
NV
Discussion

Specimens of var. macrolobus, apparently flowering the first year, have been misidentified as Astragalus geyeri, which is clearly annual and has straight, appressed (not villosulous) indumentum. Variety macrolobus occurs in northern Nevada. To the north and east, it grades into var. salinus and to the west into var. floribundus.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Diphysi > Astragalus lentiginosus
Sibling taxa
A. lentiginosus var. albifolius, A. lentiginosus var. ambiguus, A. lentiginosus var. antonius, A. lentiginosus var. australis, A. lentiginosus var. chartaceus, A. lentiginosus var. coachellae, A. lentiginosus var. coulteri, A. lentiginosus var. diphysus, A. lentiginosus var. floribundus, A. lentiginosus var. fremontii, A. lentiginosus var. higginsii, A. lentiginosus var. idriensis, A. lentiginosus var. ineptus, A. lentiginosus var. kennedyi, A. lentiginosus var. kernensis, A. lentiginosus var. latus, A. lentiginosus var. lentiginosus, A. lentiginosus var. maricopae, A. lentiginosus var. micans, A. lentiginosus var. mokiacensis, A. lentiginosus var. multiracemosus, A. lentiginosus var. negundo, A. lentiginosus var. nigricalycis, A. lentiginosus var. oropedii, A. lentiginosus var. palans, A. lentiginosus var. piscinensis, A. lentiginosus var. platyphyllidius, A. lentiginosus var. pohlii, A. lentiginosus var. salinus, A. lentiginosus var. scorpionis, A. lentiginosus var. semotus, A. lentiginosus var. sesquimetralis, A. lentiginosus var. sierrae, A. lentiginosus var. stramineus, A. lentiginosus var. toyabensis, A. lentiginosus var. trumbullensis, A. lentiginosus var. variabilis, A. lentiginosus var. vitreus, A. lentiginosus var. wahweapensis, A. lentiginosus var. wilsonii, A. lentiginosus var. yuccanus
Synonyms Cystium macrolobum
Name authority (Rydberg) Barneby: Leafl. W. Bot. 4: 89. (1945)
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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