Astragalus montii

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Astragalus montii
Astragalus montii.jpg

Threatened (ESA)
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Genus: Astragalus
Species:
A. montii
Binomial name
Astragalus montii
S.L.Welsh

Astragalus montii is a rare species of flowering plant in the legume family known by the common name heliotrope milkvetch. It is endemic to Utah in the United States, where there are only three known populations.[1] It is a federally listed threatened species of the United States.[2] This species is often treated as a variety of .[1][3]

This plant is a small perennial herb growing just a few centimeters tall. The leaves are pinnately compound, with several pairs of leaflets. The inflorescence contains two to eight flowers which are pinkish purple in color with white wing-tips. The fruit is an inflated legume pod which is pinkish in color with purple mottling. Blooming occurs in the summer months.[1][4] The flowers are pollinated by a number of native bee species, especially genus Osmia.[5]

This plant is endemic to the Wasatch Plateau of central Utah. The three populations are located in an eight-mile stretch of mountainous habitat in the Manti-La Sal National Forest. There is a population on White Mountain, one on Heliotrope Mountain, and one on the ridgecrest connecting Heliotrope Mountain to Ferron Mountain. The subalpine habitat is made up of limestone shale barrens near the timberline. Other plants in the habitat include cushion phlox (Phlox pulvinata), (Pseudocymopterus montanus), woolly groundsel (Packera cana), spiny milkvetch (Astragalus kentrophyta), (Eriogonum brevicaule), Bear River fleabane (Erigeron ursinus), (Potentilla ovina), and (Potentilla concinna).[4]

The main threat to the species is energy development.[1] The area is experiencing active oil and gas exploration.[4] This is the main reason the species was added to the Endangered Species List with threatened status in 1987.[2]

References[]

  1. ^ Jump up to: a b c d Astragalus limnocharis var. montii. The Nature Conservancy.
  2. ^ Jump up to: a b USFWS. Final rule to determine Astragalus montii (heliotrope milkvetch) to be threatened species, with designation of critical habitat. Federal Register November 6, 1987.
  3. ^ Astragalus limnocharis var. montii. USDA Plants Profile.
  4. ^ Jump up to: a b c Astragalus montii. Archived October 26, 2011, at the Wayback Machine Center for Plant Conservation.
  5. ^ Geer, S. M., et al. (1995). Pollinator sharing by three sympatric milkvetches, including the endangered species Astragalus montii. Great Basin Naturalist 55(1) 19-28.
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