a. Flowering branch, with enlargement of abaxial leaf surface to show marginal gland. b. Flower bud, borne in a four-flowered umbel. c. Flower, posterior petal uppermost. d. Anthers opposite petals, adaxial view (left) and lateral view (right). e. Anthers opposite sepals, adaxial view (left) and lateral view (right). f. Gynoecium. g. Apex of style. h. Fruit from above, with anterior sepal pointing downward. Scale bar equivalents:
a, 4 cm (2 mm); b, 8 mm; c, 1.3 cm; d–f, 2.7 mm; g, 0.9 mm; h, 4 cm. Based on: a–g, Angulo 116, MICH; h, Angulo 594, MICH. Drawn by Karin Douthit. Modified from a drawing first published by W. R. Anderson in Contr. Univ. Michigan Herb. 21: 55. 1997; reproduced with the author's permission.