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Astragalus holmgreniorum is a rare species of milkvetch known by the common names Holmgren milk-vetch and paradox milk-vetch.
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Astragalus holmgreniorum is a rare species of milkvetch known by the common names Holmgren milk-vetch and paradox milk-vetch. It is native to a tiny section of desert shrub woodland on the border between Utah and Arizona, in the far northern Mojave Desert. There are six populations remaining. It is a federally listed endangered species.
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The Astragalus holmgreniorum is a herbaceous non-woody perennial that produces small purple flowers during the spring. This stem-less perennial grows close to the ground and after flowering, it dies back to the root crown. Astragalus holmgreniorum grows close to the ground with its leaves pinnately compound, on opposite sides of the stem in a row. The leaves are 4 to 13 cm long and have 9 to 15 leaflets that are 0.6 to 1.6 cm long and are obovately shaped. The purple flowers are pedicels that consist of short floral stalks that grow on a branched supporting stalk. They have a distinct pea-like shape with 5 petals ranging from 1.8 to 2.4 cm in length and 0.6 to 0.9 cm in width. The flowers grow in groups of 6 to 16. Astragalus holmgreniorum produces fruits that are two-chambered legume pods that keep up to 38 seeds. The pods are 3 to 5 cm long and 0.6 to 0.9 cm wide.
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Arizona, Utah
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Diet Astragalus holmgrenorium is a photoautotrophic plant. This means that it relies on photosynthesis to produce its energy from sunlight. Pollinators Astragalus holmgrenorium relies on the production of seeds for reproduction. Seeds are dispersed by insect visitation, pollination, water, and smaller ground-dwelling birds. Native bees such as Anthophora coptognatha, Anthopora dammersi, Anthopora porterae, Eucera quadricincta, Osmia titusi, two types of Dialictus species, and the introduced honeybee, Apis mellifera, are the primary visitors and pollinators of A. holmgreniorum. Habitat Astragalus holmgrenorium requires appropriate soils, geological layers, slope, drainage and plant community within the landscape to provide space for individual and population growth. A. holmgrenorium occurs in the Mojave Desert ecoregion: the Sonora-Mojave-Creosotebush-White Bursage Desert Scrub. Its native habitat is sparsely vegetated, warm, and desert. The desert scrub has a sparse to a moderately dense layer of shrubs (2-50% coverage). The landscape has small and large hills, along with plateau formations that are broken up by water erosion. Specifically, A. homgrenorium plants are found on the Virgin Limestone member, middle red member, and upper red member of the Moenkopi Formation and the Petrified Forest member of the Chinle Formation. Astragalus holmgreniorum occurs at elevations from 2480 to 3000 ft, and is found slightly above or on the edge of drainage areas. Populations receive run-on water from nearby sloping areas. Astragalus holmgrenorium is associated with the following soils that are defined by the USDA: Badlands – very steep Eroded land-Shalet complex – warm Hobog-rock land association Isom cobbly sandy loam Gypill Hobog complex – 6-35% slopes Gypill very cobbly sandy loam – 15-40% slopes Hobog-Grapevine complex – 2-35% slopes Other native plants in association with A. holmgrenorium include: Desert goldenhead (Acamptopappus sphaerocephalus) White burrobush (Ambrosia dumosa) Nevada jointfir (Ephedra nevadensis) Torrey's jointfir (Ephedra torreyana) White ratany (Krameria grayi) Range ratany (Krameria parvifolia) Anderson wolfberry (Lycium andersonii) Threadleaf snakeweed (Gutierrezia microcephala) Broom snakeweed (Gutierrezia sarothrae) Range Astragalus holmgrenorium has a relatively small geographic distribution. All six known populations of A. holmgrenorium occur within approximately 10 miles of St. George, Utah. These populations are distributed throughout Washington County, Utah and Mojave County, Arizona.
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