a. Flowering branch. b. Node with interpetiolar stipules. c. Base of lamina, abaxial view, to show glands. d. Umbel of four flower buds subtended by reduced leaves. e. Flower from above, flattened. f. Functionally staminate flower, lateral view, perianth and some stamens removed. g. Anthers from functionally staminate flower, adaxial view (left) and abaxial view (right). h. Stigma from functionally staminate flower. i. Functionally pistillate flower, lateral view, perianth and some stamens removed. j. Anthers from functionally pistillate flower, adaxial view (left) and abaxial view (right). k. Stigma from functionally pistillate flower. l. Samara, with carpophore at base. Scale bar equivalents:
a, 4 cm; b, 4 mm; c, 2.7 mm; d, e, 8 mm; f, 2.7 mm; g, 2 mm; h, 1 mm; i, 2.7 mm; j, 2 mm; k, 1 mm; l, 1.3 cm. Based on: a–d, i–k, Miller et al. 8749, MICH; e–h, Kotozafy 332, MICH; l, Schatz et al. 1699, MO. Drawn by Karin Douthit. © University of Michigan Herbarium.