a. Flowering branch. b. Base of leaf, abaxial view, with enlarged hair from abaxial surface. c. Petiole bearing minute stipules at base. d. Flower, lateral view, posterior petal to left. e. Anther, abaxial view. f. Apex of syle. g. Samara. Scale bar equivalents:
a, 4 cm; b, 5 mm (ca. 0.75 mm); c, d, 4 mm; e, 2 mm; f, 1 mm; g, 2 cm.—Based on: a–f, Anderson et al. 37119, MICH; g, Anderson et al. 37118, MICH. Drawn by Karin Douthit. First published in Contr. Univ. Michigan Herb. 16: 76. 1987; reproduced with permission of the author.