Astragalus desperatus

Astragalus desperatus (common name - rimrock milkweed) is a perennial plant in the legume family (Fabaceae) found in the Colorado Plateau and Canyonlands region of the southwestern United States.[2]:120

Astragalus desperatus
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Genus: Astragalus
Species:
A. desperatus
Binomial name
Astragalus desperatus
M.E. Jones[1]

Description

Growth pattern

It is a low growing perennial plant growing from 1⁄2 to 4 1⁄2 inches (1.3 to 11.4 cm) tall.[2]:120

Leaves and stems

Compound pinnate leaves are from 1⁄2 to 4 1⁄2 inches (1.3 to 11.4 cm) long, with 7–17 elliptical to inversely lanceolate leaflets.[2]:120

Inflorescence and fruit

It blooms from March to August.[2]:120 The inflorescence are from stalk to 5 inches (13 cm) tall, with multiple flowers on short stems from the stalk.[2]:120 Each ink to purple flower has a calyx tube that is bell-shaped and up to 1⁄2 inch (1.3 cm) long, and petals to 1⁄4 inch (0.64 cm) long.[2]:120 Seed pods are up to 3⁄4 inch (1.9 cm) long, elliptical or curved, and covered with stiff hairs.[2]:120

Habitat and range

It grows only on the Colorado Plateau (endemic) in mixed desert shrub and pinyon-juniper forest communities.[2]:120

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References
  1. "Astragalus desperatus M.E. Jones". Integrated Taxonomic Information System.
  2. Canyon Country Wildflowers, Damian Fagan, 2nd ed., 2012, Morris Bush Publishing, LLC. in cooperation with Canyonlands Natural History Association, ISBN 978-0-7627-7013-7
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