Tetrapterys natans. a. Flowering branch. b. Detached large leaf, adaxial view. c. Node with connate interpetiolar stipules. d. Umbel with one flower bud, the other three removed, subtended by reduced orbicular inflorescence leaves, the left showing adaxial surface, the right showing abaxial surface. e. Flower, posterial petal uppermost. f. Stamens, abaxial view (above) and adaxial view (right). g. Gynoecium, anterior style in center. h. Mericarp, adaxial view. i. Mericarp, abaxial view. j. Mericarp, cross-section, seed removed. Scale bar equivalents: a, b, 4 cm; c, 4 mm; d, e, 5.7 mm; f, g, 2 mm; h–j, 1.3 cm. Based on: a, c–g, Vester 700, MICH; b, i, j, Vester 744, MICH; h, Díaz et al. 211, MO. Drawn by Karin Douthit. First published by W. R. Anderson in Contr. Univ. Michigan 25: 108. 2007.
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