a. Flowering branch. b. Node showing interpetiolar stipules and glands at base of petioles. c. Hairs from adaxial surface of lamina. d. Hair from abaxial surface of lamina. e. Flower, posterior petal at upper right. f. Anthers, opposite a petal (left) and opposite a sepal (right). g. Distal portion of style. h. Fruit with two samaras removed. i. Samara, adaxial view. Scale bar equivalents:
a, 4 cm; b, 4 mm; c, d, 0.6 mm; e, 4 mm; f, 1.6 mm; g, 0.7 mm; h, i, 5 mm. Based on Prance et al. 19274, MICH. Drawn by Karin Douthit. First published by W. R. Anderson in Contr. Univ. Michigan Herb. 14: 18. 1980.