Oreocarya crassipes is a rare species of flowering plant in the borage family known by the common name Terlingua Creek cat's-eye. It is endemic to Brewster County, Texas, where it is known from only ten populations totaling about 5000 plants.[3] All of the occurrences are within a ten-kilometer radius.[1] This is a federally listed endangered species.
| Oreocarya crassipes | |
|---|---|
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Boraginales |
| Family: | Boraginaceae |
| Genus: | Oreocarya |
| Species: | O. crassipes
|
| Binomial name | |
| Oreocarya crassipes (I.M.Johnst.) Hasenstab & M.G.Simpson
| |
| Synonyms[2] | |
|
Cryptantha crassipes I.M.Johnst. | |
Description
editThis is a perennial herb producing several erect stems reaching a maximum height around 25 centimeters. There is a clump of basal leaves around the stem bases. The herbage is covered in silvery soft and bristly hairs. The inflorescence is a head of yellow-throated white flowers.[1] The plants are often coated in a sooty black fungus.[3]
Distribution and habitat
editThis plant grows only on the Fizzle Flat lentil, a small geologic formation in the Terlingua Creek watershed just north of Big Bend National Park.[3][4] This lentil is a unique expanse of limestone rock which is rich in gypsum and bound with clay. The formation, which locals call a "moonscape",[4] is pale yellow in color because of its mineral makeup and about 50 feet thick.[5] The chalky rock breaks into plates and contains many fossils. The area is very dry and it receives full, hot sunlight.[3][1][6] The lentil is almost totally devoid of plant life; this species and other hardy plants, such as Castilleja elongata and Lycium berberioides, occur around the edge of the lentil.[3][1]
The rare plant is limited to a specific substrate. The area is affected by human activity in several ways. The land is all privately owned and unprotected. Off-road vehicles drive on the badlands, which are used both in the mining of bentonite and for access in the grazing of livestock in the area.[3][1]
References
edit- ^ a b c d e f Cryptantha crassipes. The Nature Conservancy.
- ^ "Oreocarya crassipes (I.M.Johnst.) Hasenstab & M.G.Simpson". Plants of the World Online. Royal Botanic Gardens, Kew. 2023. Retrieved 17 April 2023.
- ^ a b c d e f Cryptantha crassipes. Archived 2010-12-15 at the Wayback Machine Center for Plant Conservation.
- ^ a b Cryptantha crassipes. Texas Parks and Wildlife.
- ^ USGS. Geologic Unit: Fizzle Flat. National Geologic Map Database.
- ^ USFWS. Final rule to list the plant Cryptantha crassipes (Terlingua Creek Cat's-eye) as endangered. Federal Register September 30, 1991.
External links
editFurther reading
edit- Moon, C. G. (1953). Geology of Agua Fria Quadrangle, Brewster County, Texas. Geological Bulletin 64:2 151.