CYPERUS GRANITOPHILUS (CYPERACEAE), A GRANITE OUTCROP ENDEMIC, NEW FOR TEXAS AND OKLAHOMA (U.S.A.)

摘要

Cyperus granitophilus McVaugh (Cyperaceae) has been discovered at Enchanted Rock State Natural Area in Gillespie and Llano counties in the Llano Uplift of Central Texas. Examination of herbarium specimens of the closely related C. squarrosus L. revealed 18 additional collections (total of 27) of C. granitophilus from the Llano Uplift of Texas, 10 collections from the Wichita Mountains in Comanche and Greer counties, Oklahoma, and one collection from the Arbuckle Uplift in Johnston County, Oklahoma. All collections were from regions with granitic outcrops. These collections represent the first documented occurrences of C. granitophilus in Texas and Oklahoma andaré disjunct approximately 1270 km from the nearest previously documented populations in the Piedmont of Alabama.