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According to Wang and Xie, their recently published genus Trirostellum is
distinguished from its allied genera by a number of characteristics: (1) the stamens
with their filaments coherent into a central column; (2) the female flowers possessing
rudimentary stamens; (3) the ovary 3-celled, with one ovule in each cell; (4) the fruits
dehiscent, 3-rostrated at the apex; (5) the fruits possessing persistent perianth; (6)
the seeds tuberculate and winged. However, upon a careful comparison of Trirostell-
um yixingensis Z.P. Wang et Q. Z. Xie, the type species of Trirostellum with Gyno-
stemma pentaphyllum (Thunb.) Mak., the type species of Gynostemma Bl. and some
other species of Gynostemma as well,we have found that the representatives of the
above two genera are identical in most of the important diagnostic characteristics ex-
cept that the fruits of the former genus are dehiscent with three long beaks at the
apex, while the fruits of the latter genus are indehiscent with very short beaks.
Besides, results obtained from chromosome counting haove shown that the somatic
chromosome number of Trirostellum yixingensis is 2n=22, while that of Gynostemma
pentaphyllum is 2n=28.Yet these morphological and chromosomal differences seem
not sufficient for generic demarcation. We, therefore, suggest that Trirostellum bereduced to a sectional or subgeneric rank of Gynostemma Bl. 相似文献
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山茱萸属应予重新确认 总被引：1，自引：0，他引：1
The genus Macrocarpium has been accepted only by a few scholars since
its separation from Cornus L. by T. Nakai in 1909. Bentham, Hooker, Hutchinson and
the others consider that the ovary of Macrocarpium is 2-celled and the genus should be
placed back into Cornus. We have discovered that are generally I-celled. In addition,
Macrocarpium is different from Cornus in basic chromosome number (X), flowering
physiological character, inflorescence type and involucral scale. Thus the genus Ma-crocarpium (Spach) Nakai should be reaffirmed. 相似文献
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