Tetrapterys salicifolia. a. Flowering habit. b. Base of leaf, abaxial view (above) and adaxial view (left). c. Node with interpetiolar stipules. d. Flower bud and portion of inflorescence axis. e. Flower, posterior petal uppermost. f. Petals, adaxial view, lateral petal (above) and posterior petal (right). g. Portion of androecium laid out, adaxial view, short stamen at left opposite posterior petal. h, Anther, lateral view. i. Gynoecium, anterior style in center. j. Distal portion of lateral style. k. Samaras, abaxial view (left) and adaxial view (right). Scale bar equivalents: a, 4 cm; b, 4 mm; c, 2.7 mm; d, 5.7 mm; e, 8 mm; f, 5 mm; g, 2 mm; h, 1.3 mm; i, 2.7 mm; j, 0.8 mm; k, 1.3 cm. Based on: a–c, Kummrow 2108, MICH; d, Goodland 747, MICH; e–j, Occhioni 3439, MICH; k, Anderson 13616, MICH. Drawn by Karin Douthit. © University of Michigan Herbarium.
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