Draba graminea

Draba graminea

Imperiled  (NatureServe)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Brassicales
Family: Brassicaceae
Genus: Draba
Species: D. graminea
Binomial name
Draba graminea
Greene

Draba graminea is a species of flowering plant in the mustard family known by the common names Rocky Mountain draba and San Juan Whitlow-grass. It is endemic to the state of Colorado in the United States, where it is limited to the San Juan Mountains.[1]

This species is a small perennial herb forming a clump just a few centimeters tall. The leaves are linear to lance-shaped. The inflorescence is a raceme of up to 15 flowers with yellow petals up to half a centimeter long. The fruit is a flattened oval or lance-shaped silique up to 1.1 centimeters long.[2]

This plant grows in high mountain habitat types, mainly in alpine climates, and sometimes in the subalpine zone. It grows in rocky talus and tundra habitat, most commonly in the latter. It grows in areas where snow persists most of the year. The soils are gravelly and sandy and mostly of volcanic origin. The plant can be found in rock cracks. Associated plants include Ranunculus macauleyi, Poa alpina, Festuca brachyphylla ssp. coloradensis, Geum rossii var. turbinatum, and Silene acaulis var. subacaulescens.[3]

Threats to the species are uncertain due to the remoteness and inaccessibility of the habitat.[1][3] The main threat is thought to be recreational activity.[1]

References

  1. 1 2 3 Draba graminea. NatureServe.
  2. Draba graminea. Flora of North America.
  3. 1 2 Moore, L. and S. Friedley. (2004, September 30). Draba graminea Green (Rocky Mountain draba): a technical conservation assessment. [Online]. USDA Forest Service, Rocky Mountain Region.

External links

This article is issued from Wikipedia - version of the 10/26/2012. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.