a. Fruiting branch. b. Enlargement of adaxial leaf surface to show scalariform crossveins. c. Samaras, abaxial view (left) and lateral view (right). d. Embryos, whole (left) and in longitudinal section (right). e. Flower bud borne on portion of inflorescence axis. f. Flower, lateral view, with erect posterior petal; lateral petals removed. g. Anther, abaxial view. h. Gynoecium, anterior style in center. i. Apex of style, adaxial view. Scale bar equivalents:
a, 4 cm; b, 8 mm; c, 2.7 cm; d, 6.7 mm; e, 4 mm; f, 5 mm; g, 1.3 mm; h, 2 mm; i, 1.3 mm. Based on: a–d, Kayap 569, MICH; e–i, Klug 654, NY. First published in Contr. Univ. Michigan Herb. 23: 99. 2001. Drawn by Karin Douthit. Reproduced with permission of the authors.