a. Flowering branch. b. Node to show large interpetiolar stipules. c. Enlargement of abaxial surface of lamina with gland set well in from margin. d. Base of lamina and petiole to show glands. e. Flower bud and section of inflorescence axis. f. Enlargement of peduncle, bracteoles, and subtending bract. g. Flower. h. Stamens. i. Anthers, adaxial view (above) and abaxial view (below). j. Gynoecium. k. Distal portion of style. l. Complete indehiscent fruit. m. Winged fruit with one mericarp hiding the other two. n. Cross-section of mature fruit, with one seed developed and the other two aborted. o. Embryo, lateral view (left) and face view (right). Scale bar equivalents:
a, 4 cm; b, 8 mm; c, 4 mm; d, 1.3 cm; e, 8 mm; f, 4 mm; g, 8 mm; h, 5.7 mm; i, 4 mm; j, 5.7 mm; k, 2 mm; l, m, 1 cm; n, o, 8 mm. Based on: a, e–k, de Wilde 4719, MO; b–d, de Wilde 6467, MO; l–o, Gillett 18778, MO. Drawn by Karin Douthit. © University of Michigan Herbarium.