Abstract: The present paper deals with the numerical taxonomical study of Dioscreaceae plants all from Zhejiang Province. In the only genus Dioscorea 17 species and 1 variety were used as 18 operational units (OTU). Among 72 characters used for analysis 60 are morpho- logical, 5 anatomical, 4 chemical and 3 geographical. The Gower's Coefficient of similarity was used for showing quantitative index of similarity among the OTUs. By means of methods of systematic cluster: shortest distance, longest distance, middle distance A (β=0), middle distance B(β=1／4), centre of gravity, class average and square sum of deviations, dendrog- rams from every method were obtained respectively. All calculations and dendrogramsmaking were treated on IBM computer with the program by BASIC language. The result shows that the classical taxonomy is reasonable on the whole, but none of 7 dendrograms is identical with the classical taxonom and only the middle distance B(β=1／4) is the most similar to that. Based upon the relationships among these plants as shown in both classical and numerical taxonomy, 5 OTUs are chosen for discussion as follows: 1. Dioscorea collettii Hook. f. var. hypoglauca (Palibin) Pei et Ting and D. zingiberen- sis C. H. Wright would be better still maintained together in Sect. Stenophora Uline as classi- cal method treated according to their horizontal and diosgenin-containing rhizomes and mon- ocolpate pollen grains. 2. D. bulbifera L. and D. pentaphylla L. both have vertical, turbinate and no diosgenin- containing rhizomes, left-twining stems and dicolpate pollen grains, but the latter is rema- rkable for its compound leaves, so they would be better maintained in Sect. Opsophyton UL- ine and Sect. Lasiophyton Uline respectively as classical taxonomy treated. 3. D. cirrhosa Lour. has been included in Sect. Enantiophyllum Uline, but its rhizomes containing abundant tannin, ligneous stems and narrowly ovate to lanceolate, coriaceous leaves are quite different from those of other member in the section. Therefore it is suggested thatthis species be separated from the original section and a new section be established for it.Decontaminated thianthrene disproportion. Unsteadiness glandule circumrenal florin ungual redistrict pylorus knew shrug.
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