1 Vascular Flora of a Gypsum Dominated Site in Major County,

A total of 233 taxa of vascular plants in 173 genera and 61 families were collected at a site dominated by gypsum outcrops in Major County. The largest families were the Asteraceae (44 species), Poaceae (40 species), Fabaceae (14 species), and Euphorbiaceae (13 species). Seventy-seven species were annuals, 2 were biennials, and 152 were peren-nials. Twenty woody plant species were collected and 22 exotic species (10.6 % of the total fl ora) were also present. Three species tracked by the Oklahoma Natural Heritage Inventory (Chamaesyce carunculata, Echinocereus reichenbachii, and Escobaria vivipara) were present. This study re ports 83 species previously not documented in Major County