摘要：

    肠薯蓣(D．simulans Prain et Burk．)改属根状茎组；触丝薯蓣(D．tentaculigera Prain et Burk.)应列入顶生翅组  (Sect．shannicorea Prain et Burk．)，  并提出了盾叶薯蓣  (D. zingiberensis  Wright)和穿龙薯蓣(D．nipponica Makino)种的划分和定名的意见。

Abstract:

The synthetic studies on the external morphology, cytology, pollen morphology and

phytochemistry of the Sect. Stenophora Uline of Dioscorea L. give the evidence to

their phylogenetic relationships and indicate that this section is a primitive natural

group of this genus, characterized by: 1.  The  horizonal and perennial subterranean

rhizome, while the members of other sections bear annual or perennial vertical tubers.

2. Most of its species are diploids, while the species of other sections are polyploids. 3.

The pollen grain is monocolpate, the ornamentation  of  the  exine  is  reticulate  or

granulate-striate, while those of the other sections are bicolpate, reticulate. 4. All the

species in this section contain steroidal sapogenin, while the members of other sections

are devoid of sapogenin.

     According to R. Knuth's classification  (1924),  N. N. FepacNMeHKo  (1972) sug-

gested that no apparent relationship was found in the distribution of steroidal sapo-

genin to the species of Dioscorea, our studies on the Sect. Stenophora showed the dis-

agreement to his conclusions.

     Regarding the systematic position of section and species,  we suggest Burkill's

Sect.  Illigerestrum should be cancelded, the species D. simulans erroneously put into

Sect.  Illigerestrum by Burkill (1936) be to the Sect. Stenophora. We also suggest that

D. tentaculigera Prain et Burk. of Sect.  Stenophora as treated by Burkill should be

transferred to Sect. Shannicorea.

     The classification and nomenclature of the species D. zingiberensis Wright and

D. nipponica Makino are also discussed.