a. Flowering branch. b. Node showing stipules and glands at base of petioles. c. Enlarged portion of abaxial leaf surface, showing vesture and gland. d. Hairs from abaxial surface of lamina (left) and adaxial surface (right). e. Detached large leaf, adaxial view. f. Flower bud and portion of inflorescence axis. g. Lateral petal, lateral view. h. Posterior petal, abaxial view. i. Four stamens, abaxial view, those with longer filaments opposite sepals. j. Gynoecium. k. Samaras, abaxial view (left) and adaxial view (right). Scale bar equivalents:
a, 4 cm; b, c, 8 mm; d, 1.3 mm; e, 4 cm; f, 5.7 mm; g, h, 4 mm; i, j, 2.7 mm; k, 2.7 cm. Based on: a–d, Schiavini 69, MICH; e, Hatschbach 49588, MICH; f–j, Silva et al. 2314, MICH; k, Anderson 11311, MICH. Drawn by Karin Douthit. First published by W. R. Anderson & C. C. Davis in Contr. Univ. Michigan Herb. 24: 41. 2005.