Flora of North America species comparison

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Astragalus cremnophylax var. cremnophylax

Astragalus cremnophylax var. hevronii
Photo is of parent taxon

sentry milkvetch
Photo is of parent taxon

hevron's milkvetch, sentry milkvetch
Habit Plants forming soft cushions. Plants forming tufts or prickly cushions.
Leaves

rachis lax, soft.

rachis erect or ascending, stiff.
Corollas

banner 5.3–6.1 × 4.3–4.6 mm;

keel 3.7–4.3 mm.

banner 7–8 × 5.4–6 mm;

keel 5.2–5.7 mm.

Astragalus cremnophylax var. cremnophylax

Astragalus cremnophylax var. hevronii
Phenology Flowering May–Jun. Flowering Apr.
Habitat Crev­ices of limestone pavement, in pinyon pine belt. In Kaibab Limestone crevices.
Elevation 2100–2200 m. (6900–7200 ft.) 1500–1600 m. (4900–5200 ft.)
Distribution
from FNA
AZ
[BONAP county map]
from FNA
AZ
[BONAP county map]
Discussion

Variety cremnophylax is restricted to the North and South rims of the Grand Canyon. S. E. Travis et al. (1996) found genetic variation between plants in populations (one very low in a small South Rim population) and comparatively substantial variation between populations. Greater genetic variation occurred in the North Rim plants, which constitute the largest population.

Variety cremnophylax is in the Center for Plant Conservation’s National Collection of Endangered Plants.

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

Variety hevronii is known only from the eastern rim of Marble Canyon along the Colorado River.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Humillimi > Astragalus cremnophylax Fabaceae > subfam. Faboideae > Astragalus > sect. Humillimi > Astragalus cremnophylax
Sibling taxa
A. cremnophylax var. hevronii, A. cremnophylax var. myriorrhaphis
A. cremnophylax var. cremnophylax, A. cremnophylax var. myriorrhaphis
Name authority unknown Barneby: Brittonia 44: 238. (1992)
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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