. Botanische Jahrbu?cher fu?r Systematik, Pflanzengeschichte und Pflanzengeographie. Botany; Plantengeografie; Paleobotanie; Taxonomie; Pflanzen. A revision of the genus Mitclia etc. 389 Province of Wakasa: near Kumagawa (K. Tsuzi, April 10, 1901). Said to be a rare species, and to differ from M. japonica by the smaller and denser flowers, 3-fid petals, semi-glabrous leaves, glabrous petioles and sterile bracts upon the scape. Not seen by us. Part. III. Relationship and Geographical Distribution. The accompanying diagram (fig. 9), seeks to shov^ in a graphic way the relationship of the section
. Botanische Jahrbu?cher fu?r Systematik, Pflanzengeschichte und Pflanzengeographie. Botany; Plantengeografie; Paleobotanie; Taxonomie; Pflanzen. A revision of the genus Mitclia etc. 389 Province of Wakasa: near Kumagawa (K. Tsuzi, April 10, 1901). Said to be a rare species, and to differ from M. japonica by the smaller and denser flowers, 3-fid petals, semi-glabrous leaves, glabrous petioles and sterile bracts upon the scape. Not seen by us. Part. III. Relationship and Geographical Distribution. The accompanying diagram (fig. 9), seeks to shov^ in a graphic way the relationship of the sections and species to each other and the course of evo- lution in the genus. Where 10 and o-stamened species occur in a group of clearly related species like Mitella^ the inevitable conclusion is that the forms with 10 stamens represent the older types and that those with. Fig. 1. Sepals in the Sect. Eumitella, showing venation, position of petals, stamens and disk, a M. diphylla, b M. stauropetala, c and d M. stauropetala var. sienopeiala, e and f M. trißda, g M. trißda var. violacea, h M. diversifoUa. X 10. 5 stamens have been derived from them through reduction of one or the other of the two cycles of stamens. On this hypothesis, therefore, both M. diphylla and M. nuda are older types than the other species and form the starting points from which the others have evolved. These two parent forms show certain close similarities and also some very important divergencies of floral structure, as reference to the figures will show. For the sake of comparing these structures to the best advantage, drawings of the different organs of the flower of all the species except one, have been made and arranged in the sequence that we conceive the order of progression to have taken place. In this scheme the odd numbers of figures represent one series or section. The even numbers the other series or Please note that these images are extracted from scanned page images that may have been
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1881
