The following Participating Institutions are custodians for this species in the CPC National Collection:
San Antonio Botanical Garden
The conservation of Thymophylla tephroleuca is fully sponsored.
Cindy Barrett contributed to this Plant Profile.
Ashy dogweed is an attractive perennial wildflower. The ashy grayish-green stems and leaves of this plant give it its name. After rains, the beautiful ashy dogweed blooms bright yellow daisy-like flowers against a mound of gray-green foliage from March to May. It grows in a sandy, grassland-shrub habitat in south Texas. At the time when this plant was listed as federally endangered (1984), only one population was known to exist in the wild, but several new populations have been recently discovered. Aggressive exotic grasses, cattle grazing and trampling, and loss of habitat due to urbanization has caused this perennial herb to be listed as an endangered species. (USFWS 1988).
Distribution & Occurrence
Found on fine, sandy-loam soil in open areas of grassland-shrub communities. Dominant associates include Castela, Cordia, Prosopsis, Microrhamnus, Leucophyllum, Cercidium, and Yucca. (USFWS 1984)
|6 populations are known in northern Zapata County and southern Webb Counties, Texas (Texas Parks and Wildlife 2002)|
Conservation, Ecology & Research
Research done at the National Wildflowers Research Center in Austin, Texas discovered that the seed germinated best when heat stratified. (Crank 1992)
Additional tests on heat stratification.
Seed collection from the different populations for storage at the National Seed Storage Lab.
Jennings, W.F. 1990. Status Report on four plants considered rare in Colorado: Aletes humilis, Platanthera sparsiflora, Listera borealis, and Listera convallarioides. Unpublished report to the U.S. Forest Service.
Spackman, S.; Jennings, B.; Coles, J.; Dawson, C.; Minton, M.; Kratz, A.; Spurrier, C.; Skadelandl, T. 1997. Colorado Rare Plant Field Guide. Fort Collins, CO: Prepared for the Bureau of Land Management, the U.S. Forest Service, and the U.S. Fish & Wi