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all drawings
Callaeum macropterum. a. Flowering branch. b. Base of leaf, adaxial view to show stipules and glands. c. Flower bud. d. Flower, posterior petal uppermost. e. Posterior petal, adaxial view. f. Androecium laid out, abaxial view, the stamen just above the letter "f" opposite posterior petal. g. Gynoecium, with anterior style in center. h. Stigmas enlarged, abaxial view (above) and adaxial view (below). i. Samara, abaxial view. j. Ventral areole of samara. Scale bar equivalents: a, 4 cm; b, 8 mm; c, 5 mm; d, e, 8 mm; f, g, 2.7 mm; h, 1.3 mm; i, 4 cm; j, 1.1 cm. Based on: a–i, McVaugh 22857, MICH; j, Daniel 952, MICH. Drawn by Karin Douthit. © University of Michigan Herbarium.
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other drawings:

C. antifebrile

C. johnsonii

C. malpighioides

C. psilophyllum

C. septentrionale