A New Combination in Senna (Leguminosae, Caesalpinioideae) from the Department of Valle del Cauca, Colombia

Abstract. A new combination, Senna tocotana (Rose ex Britton & Killip) Silverst., is proposed for Chamaefistula tocotana Rose ex Britton & Killip, the latter name previously placed in synonymy of S. viminea (L.) H. S. Irwin & Barneby. The Colombian species S. tocotana is not conspecific with the Jamaican species S. viminea. They differ notably in the size and shape of the fruits and in the arrangement of seeds; the fruits of S. viminea are shorter and broader than in S. tocotana, and the seeds are biseriate (in two rows) versus uniseriate in S. tocotana.