| 词条 | Physaria bellii |
| 释义 |
|image = Physaria bellii 0807081.jpg |status = G2 |status_system = TNC |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Rosids |ordo = Brassicales |familia = Brassicaceae |genus = Physaria |species = P. bellii |binomial = Physaria bellii |binomial_authority = G.Mulligan }}Physaria bellii is a species of flowering plant in the mustard family known by the common names Bell's twinpod and Front Range twinpod. It is endemic to Colorado in the United States.[1][2] This perennial herb produces decumbent or prostrate stems from a caudex. The plant is covered in hairs, making it silvery. The basal leaves are toothed and the leaves along the stems are smooth on the edges. The inflorescence is a raceme of flowers with yellow petals and yellowish sepals. The fruit is a leathery pod reaching nearly a centimeter in length.[3] Flowering occurs in May and June.[1] This plant grows on the Front Range in Colorado. It grows on the Niobrara, Pierre, Fountain, Ingleside, and Lykins Formations. The soils are limestone, limestone shale, or red sandstone.[1][2] The habitat is shrubland dominated by Rhus trilobata and Cercocarpus montanus.[2] The plant is rare in general but locally abundant.[4] Potential threats to the species include hybridization with Physaria vitulifera, a more widespread plant,[5] limestone mining, road construction and maintenance, and introduced species of plants. The main threat is residential development.[1] References1. ^1 2 3 Physaria bellii. The Nature Conservancy. 2. ^1 2 Physaria bellii. Center for Plant Conservation. 3. ^Physaria bellii. Flora of North America. 4. ^Kothera, L., et al. (2007). Genetic diversity and structure in the rare Colorado endemic plant Physaria bellii Mulligan (Brassicaceae). Conservation Genetics 8(5) 1043-50. 5. ^Kothera, L., et al. (2007). Assessing the threat from hybridization to the rare endemic Physaria bellii Mulligan (Brassicaceae). Biological Conservation 140 110-18. External links
5 : Physaria|Flora of Colorado|Flora of the Rocky Mountains|Endemic flora of the United States|Endangered flora of the United States |
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