a. Flowering branch. b. Large leaves, with enlargements of adaxial surface (left) and abaxial surface (right). c. Base of leaf and node with interpetiolar stipule. d. Umbel in bud. e. Flower, posterior petal uppermost. f. Flower with petals removed, lateral view. g. Anthers, adaxial view (left) and abaxial view (right). h. Stigma. i. Samara, adaxial view, still attached to receptacle by carpophore. j. Samara, abaxial view. Scale bar equivalents:
a, 4 cm; b, 4 cm (4 mm); c, 4 mm; d, e, 8 mm; f, 5 mm; g, 2 mm; h, 0.8 mm; i, j, 8 mm. Based on: a–h, Anderson 12868, MICH; i, j, Koch & Fryxell 8264, MICH. Drawn by Karin Douthit. First published by W. R. Anderson in Contr. Univ. Michigan Herb. 16: 70. 1987.