a. Flowering branch. b. Stipular sheath in cross-section. c. Opening flower bud. d. Flower in inflorescence, side view, posterior petal uppermost. e. Flower, posterior petal at upper left. f. Sepal and stamens, abaxial view. g. Stamens in flower, adaxial view with gynoecium removed. h. Anthers in lateral (left), abaxial (center), and adaxial (right) views. Scale bar equivalents:
a, 4 cm; b, 1 cm; c, 4 mm; d, 8 mm; e–g, 4 mm; h, 2 mm.—Based on Cowan 38597, NY. Drawn by H. M. Fukuda. First published in Contr. Univ. Michigan Herb. 11: 46. 1975; reproduced with permission of the author.