Flora of North America species comparison

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Astragalus cremnophylax var. hevronii

Astragalus cremnophylax var. cremnophylax
Photo is of parent taxon

hevron's milkvetch, sentry milkvetch
Photo is of parent taxon

sentry milkvetch
Habit Plants forming tufts or prickly cushions. Plants forming soft cushions.
Leaves

rachis erect or ascending, stiff.

rachis lax, soft.
Corollas

banner 7–8 × 5.4–6 mm;

keel 5.2–5.7 mm.

banner 5.3–6.1 × 4.3–4.6 mm;

keel 3.7–4.3 mm.

Astragalus cremnophylax var. hevronii

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

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.)

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.)
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. cremnophylax, A. cremnophylax var. myriorrhaphis
A. cremnophylax var. hevronii, A. cremnophylax var. myriorrhaphis
Name authority Barneby: Brittonia 44: 238. (1992) 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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