a. Flowering branch. b. Detached large leaf, abaxial view. c. Base of lamina, abaxial view, and distal half of petiole. d. Hairs from abaxial surface of lamina, white hair from between veins (left) and brown hairs from veins (right). e. Apex of lamina to show marginal glands. f. Flower bud. g. Flower, side view, posterior petal uppermost. h. Lateral petal, adaxial view. i. Posterior petal, adaxial view. j. Androecium laid out, abaxial view, all anthers removed except from stamen opposite posterior petal. k. Gynoecium, anterior style in center. l. Samara. Scale bar equivalents:
a, b, 4 cm; c, 8 mm; d, 4 mm; e, 8 mm; f, 4 mm; g–i, 5 mm; j, 2.7 mm; k, 2 mm; l, 2 cm.—Based on: a, f–k, Lewis 40696, MICH; b–e, l, Salinas 3051, MICH. Drawn by Karin Douthit. First published in Contr. Univ. Michigan Herb. 24: 26. 2005; reproduced with permission of the author.