Sousa Sobrinho, M. Tabatinga, G.M. Machado, I.C. Lopes, A.V. Reproductive phenological pattern of Calotropis procera (Apocynaceae), an invasive species in Brazil: annual in native areas; continuous in invaded areas of caatinga Subjects--Topical Terms: BIOLOGIA REPRODUTIVAFENOLOGIAFLORAÇÃOFRUTIFICAÇÃO