Chris Best, USFWS, has conducted germination studies at Santa Ana Wildlife Refuge
Thousands of plants are growing on private lands in Starr and Hidalgo counties of South Texas. 12 populations are growing in Starr County alone, with anywhere from 10-50 plants each. The species is quite cryptic, growing among other species like Echinocereus enneacanthus.
Known from fewer than 15 occurrences in south Texas and northern Tamaulipas, Mexico. Threatened by brush clearing and other pasture improvement techniques, over-collection for commercial sale, highway and pipeline construction and maintenance, overgrazing, and non-native grasses (Damude and Poole 1990 cited by Barrrett n.d.). A lack of pollinators could be a limiting factor, but this needs to be studied.
Highway and pipeline construction, maintenance, overgrazing, brush clearing, over-collection, non-native grasses (Damude and Poole 1990)
In 1990 there were only four populations known, containing a total of 60 plants, none of which were seedlings or juveniles. (Damude and Poole 1990)
Response to disturbance
Seed dispersal and seedling recruitment
Monitoring and Surveys
Seed collection for National Seed Storage Lab
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