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Stigmaphyllon puberum and S. hypargyreum. a–m, S. puberum. a. Flowering branch. b. Large leaf. c. Detail of margin and abaxial surface of lamina. d. Posterior petal. e. Androecium laid out, adaxial view, stamen second from left opposing the posterior petal. f. Gynoecium; posterior styles are bent slightly outward to show anterior style (in center). g. Lateral view of anterior style. h. Apex of posterior style. i–l. Four samaras, illustrating variation in size and shape of dorsal wing. m. Embryo. n–p, S. hypargyreum. n. Leaf. o. Detail of margin and abaxial surface of lamina. p. Samara. Scale bar equivalents: a, b, 4 cm; c, 2 mm; d, 8 mm; e, 4 mm; f–h, 3.3 mm; i–l, 4 cm; m, 8 mm; n, 4 cm; o, 2 mm; p, 4 cm. Based on: a, c–h, Chacón G. 1292; b, Martínez S. 1696; i, Austin & Cavalcante 4144; j, Ekman H1508; k, Garwood 987; l, m, Prance et al. 12015; n, o, Croat 7040; p, Woodworth & Vestal 621. Drawn by Karin Douthit. First published by C. Anderson in Syst. Bot. Monogr. 51: 71. 1997. © University of Michigan Herbarium.