Thelypodium eucosmum
| Thelypodium eucosmum | |
|---|---|
| Conservation status | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Rosids |
| Order: | Brassicales |
| Family: | Brassicaceae |
| Genus: | Thelypodium |
| Species: | T. eucosmum |
| Binomial name | |
| Thelypodium eucosmum B.L.Rob. | |
Thelypodium eucosmum is a species of flowering plant in the mustard family known by the common names arrow-leaf thelypody and world thelypody. It is endemic to Oregon in the United States, where it is known from Grant and Wheeler Counties.[1] There are also historical records of the plant from Baker County.[2]
This species is a biennial or short-lived perennial herb. It produces an erect, branching stem which can reach a meter in height. The basal leaves are lance-shaped or sometimes oval in shape and are borne on a short petiole. The leaves higher on the stem are smaller and have no petiole.[3] They may clasp the stem[2] or may be arrowhead-shaped, with projections extending around the stem. The inflorescence is a raceme of many flowers with purple petals. The fruit is a silique up to 6.5 centimeters long.[3]
This species occurs in the Blue Mountains of Oregon, and along tributaries of the John Day River.[4] Its habitat is dominated by sagebrush and juniper. It grows in moist areas such as river canyons and streambanks.[1][4] The plant's population size is greatly affected by the availability of water.[4] Other plants in the habitat may include Balsamorhiza spp., Bromus mollis, B. tectorum, Ericameria nauseosa, Gutierrezia sarothrae, Hordeum murinum, Lepidium spp., Purshia tridentata, Salix spp., Sarcobatus vermiculatus, and Urtica dioica.[2]
Grazing is a main threat to the species; some populations have been extirpated by livestock grazing.[4]
References
- ↑ 1.0 1.1 Thelypodium eucosmum. Center for Plant Conservation.
- ↑ 2.0 2.1 2.2 Thelypodium eucosmum. Oregon Department of Agriculture.
- ↑ 3.0 3.1 Thelypodium eucosmum. Flora of North America.
- ↑ 4.0 4.1 4.2 4.3 Thelypodium eucosmum. NatureServe.