a. Branch with flowers and fruits. b. Node with stipules. c. Base of leaf with glands, abaxial view. d. Inflorescence with flower buds. e. Flower. f. Androecium laid out, abaxial view; longer stamens are opposite petals, shorter opposite sepals. g. Gynoecium. h. Immature fruit. i. Samara. j. Cross-section through samara showing folded dorsal wing. k. Fruit with two samaras removed, showing lobed glandular disc at base of torus. Scale bar equivalents:
a, 4 cm; b, 2 cm; c, 4 mm; d, 8 mm; e, 4 mm; f, g, 2.7 mm; h, 4 mm; i, 1.3 cm; j, 1 cm; k, 5.7 mm. Based on Davis et al. 20-01, A. Drawn by Karin Douthit. First published by C. C. Davis in Amer. J. Bot. 89: 703. 2002, and reproduced with his permission.