a. Flowering branch. b. Terminal node with leaf bases and stipules. c. Hairs from abaxial surface of lamina. d. Flower in axillary fascicle. e. Three stamens opposite one petal and two sepals. f. Immature fruit with one carpel aborted. Scale bar equivalents:
a, 4 cm; b, 5.7 mm; c, 0.4 mm; d, 6.7 mm; e, 2.3 mm; f, 4 mm.—Based on: a–d, f, Maguire 32715, MICH; e, Wurdack 34405, MICH. Drawn by Annette Seidenschnur Mahler. First published in Brittonia 28: 408. 1977 [‘1976’]; reproduced with permission of the author.