| 英文摘要 |
The classification of Rehmannia presents considerable difficulties both as to the position of the genus and in the differentiation and delimitation of the various species. The genus has usually been placed in the Scrophulariaceae, in the tribe Digitaleae, but it appears also to be very close to the Gesneraceae, especially to the Cyrtandroideae (See A. P. de Candolle, Cyrtandraceae. In DC. Prodr. 9: 258-286. 1845). The relationship between the Scrophulariaceae and the Gesneraceae is close and at times the two families are not clearly seperable. The generally applied distinction is based on the number of cells in the ovary, 1 cell with parietal placentation in the Gesneraceae and 2 cells with placentae on the septum in the Scrophulariaceae. This is the criterion accepted by most authors. |
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