Monographs Details: Tabebuia uleana (Kraenzl.) A.H.Gentry
Authority: Maguire, Bassett. 1978. The botany of the Guayana Highland--part X. Mem. New York Bot. Gard. 29: 1-288.
Family:Bignoniaceae
Discussion:4. Tabebuia uleana (Kranzlin) A. Gentry, comb nov Tecoma uleana Kranzl., Fedde Rep. 17: 217. 1921, Type. Brazil. Roraima (Rio Branco), Ule 7970 (K, US). This overlooked species, previously known only from the type, has been confused with T. serratifolia (Vahl) Nichols. It differs from T. serratifolia chiefly in having the corolla tube glabrous inside and pilose leaves. Glabrous-throated but leafless collections of a yellow-flowered Tabebuia from Amazonas Territory, Venezuela were identified by Sandwith as a variant of T. serratifolia. I recently found a pilose-leaved Tabebuia with fruits resembling those of T. serratifolia in the same area; the leaves of these collections match those of the type of J. uleana and presumably come from plants having glabrous-throated corolias. Ecologically well differentiated, the Venezuelan plant is restricted to the same laja outcrops as T. pilosa and T. orinocensis. Tabebuia serratifolia is sympatric but grows mostly in forests on well-developed soil; in laja regions T. serratifolia occurs only in relatively well-developed forest on the very largest soil pockets. As thus defined Tabebuia uleana deserves species rank and the new combination in Tabebuia is justified.