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A New Combination in Glossopetalon (Crossosomataceae)

ABSTRACT As part of research leading to a treatment of the family Crossosomataceae for the Flora of North America Project, the new combination Glossopetalon spinescens (A. Gray) Greene var. planitierum (Ensign) Yatskievych is proposed to account for plants in the G. spinescens complex endemic to a small portion of the United States in the Texas Panhandle and adjacent Colorado, New Mexico, and Oklahoma. The change in status from species to variety is justified in light of the subtle patterns of morphological variation within the complex as a whole, which in recent decades has resulted in the reclassification of several other former species of Glossopetalon A. Gray as varieties of G. spinescens.