a. Flowering branch, staminate plant. b. Node with interpetiolar stipules. c. Biglandular petiole. d. Lamina, abaxial view to show glands in surface. e. Base of umbel. f. Staminate flower from above. g. Anthers from staminate flower, adaxial view (left) and abaxial view (right). h. Pistillate flower. i. Anthers from pistillate flower, adaxial view (left) and abaxial view (right). j. Gynoecium from pistillate flower. k. Apex of style. l. Samaras, abaxial view (left) and adaxial view (right). Scale bar equivalents:
a, 4 cm; b, 2 mm; c, 4 mm; d, 8 mm; e, 4 mm; f, 6.7 mm; g, 1.3 mm; h, 4 mm; i, 1.3 mm; j, 2.7 mm; k, 0.8 mm; l, 8 mm. Based on: a–g, McPherson 14364, MO; h–k, McPherson 14360, MO; l, Bernardi 11157, K. Drawn by Karin Douthit. © University of Michigan Herbarium.