a. Flowering branch. b. Apex of petiole, adaxial view, to show glands. c. Enlargement of abaxial surface of lamina. d. Base of petiole, to show stipule. e. Flower. f. Sepals with attached filaments, abaxial view (left) and adaxial view (right). g. Petal, adaxial view. h. Anthers, adaxial view (left) and abaxial view (right). i. Gynoecium. j. Samara, abaxial view. k. Nut of samara with lateral wings cut away, lateral view to show dorsal wing. Scale bar equivalents:
a, 4 cm; b–e, 4 mm; f, 2 mm; g, 4 mm; h, i, 2 mm; j, k, 1.3 cm. Based on: a–d, Ventura A. 3035, MICH; e–i, Ventura A. 7345, MICH; j, k, Martínez S. 3846, MICH. Drawn by Karin Douthit. First published in Contr. Univ. Michigan Herb. 25: 129. 2007; reproduced with permission of the authors.