Callaeum johnsonii. a. Fruiting branch. b. Adaxial view of petiole, to show stipules. c. Abaxial view of base of lamina, to show vesture and marginal glands. d. Old flower, to show large bract and bracteoles. e. Adaxial view of apex of style, to show transversely expanded stigma. f. Samara, adaxial view (above) and abaxial view (below). Scale bar equivalents: a, 4 cm; b, c, 4 mm; d, 8 mm; e, 1 mm; f, 2 cm. Based on: a–e, Cavender s.n., WIS; f, Miranda 2549, MEXU. Drawn by Karin Douthit. First published in Acta Bot. Mex. 74: 181. 2006; reproduced with permission of the author.