a. Flowering branch, with enlarged hairs from abaxial surface of lamina (left circle) and adaxial surface (right circle). b. Node with interpetiolar stipules. c. Umbel of flower buds, one of four removed. d. Flower, lateral view, posterior petal erect, one posterior-lateral petal removed. e. Petals, above left an anterior-lateral petal, the other two posterior-lateral petals. f. Partial androecium laid out, abaxial view, the stamen at left opposite posterior petal. g. Gynoecium, anterior style in middle. h. Apex of style. i. Fruit, dried but intact. j. One pyrene of fruit with flesh removed, adaxial view (left) and abaxial view (right). k. Cross-section of one pyrene of fruit with flesh removed. Scale bar equivalents:
a, 4 cm (0.8 mm); b, 4 mm; c, 8 mm; d, 6.7 mm; e, 5 mm; f, g, 3.3 mm; h, 2 mm; i–k, 1.3 cm. Based on: a–h, Rzedowski & McVaugh 1409, MICH; i–k, McVaugh 16037, MICH. Drawn by Karin Douthit. First published by W. R. Anderson in Contr. Univ. Michigan Herb. 16: 96. 1987.