Astragalus desperatus var. desperatus Family: Fabaceae (A Utah Flora – Leguminosae) – Pea Family Perennial herbs; 0.4” to 1' (1 to 30 cm) tall Leaves: alternate; compound; 7 to 17 leaflets 0.08” to 0.52” (2 to 13 mm) long, 0.04” to 0.2” (1 to 5 mm) wide; leaves 0.4” to 4.8” (1 to 12 cm) long Flowers: 5 pink or purple petals (a banner, 2 wings and 2 keels); keel shorter than the wings; 5 toothed sepals; bisexual; 5-10 stamens, 1 pistil; flowers 0.24” to 0.36” (6 to 9 mm) wide Pollinators: other Astragalus species are pollinated by bees, moths and butterflies Fruits: legume Blooms in Arches National Park: January, February, March, April, May, June Habitat in Arches National Park: desert shrub and pinyon-juniper communities Location seen: park road mile 0 to 2.5, Delicate Arch trail, outside Arches National Park in Grandstaff Canyon Other: The genus name, “Astragalus”, is the Greek name for “legume”, and may be derived from “astragalos” which means “ankle bone” referring to the shape of the leaves or the pods. The species name, “desperatus”, is one of the more humorous scientific plant names. It was named in 1891 by Marcus Jones who was “desperate” to find a name not already taken in the Astragalus genus (information about the species name from Al Schneider, www.swcoloradowildflowers.com). This plant is endemic to Emery, Garfield, Grand (type specimen was collected near Cisco), Kane, San Juan and Wayne Counties in Utah and adjacent areas in Colorado and northern Arizona. This family is ranked second to grasses in importance to people because species can fix nitrogen. However, some species, e.g., locoweeds and milkvetches, are poisonous due to selenium abstracted from the soil. |
Last updated: December 16, 2021