Psychopterys psilocarpa. a. Branch with old flowers. b. Apex of petiole to show glands. c. Samara, abaxial view. d. Samara, adaxial view. Scale bar equivalents: a, 4 cm; b, 4 mm; c, d, 1.3 cm. Based on Steyermark 45617, F. Drawn by Karin Douthit. First published in Contr. Univ. Michigan Herb. 25: 131. 2007; reproduced with permission of the authors.