This article deeply explores and analyzes the concept of species, discusses some ways and biological essence of the intraspecific variation of Chinese medicinal materials, expounds views and methods concerning species in the study of TCM, po.

philoxeroides description, intraspecific variation from native to introduced regions, its life history strategies, invasion mechanisms, and management strategies.

The pollen grains of nine plants from two localities of Helianthemum songaricumwere investigated throught the use of a scanning electron microscope,and apparant correlativity between the intraspecific variations of pollen morphology and their geographical distributions was found for the first time in the paper.

) clones( Ⅰ91- 48 and Ⅱ91- 81) and intraspecific differences oftwowild sugarcane clones to enhanced UV-B radia-tion were investigated under field conditions for two consecutive years.

Intraspecific differences in physiological responses of different wheat cultivars to enhanced UV-B radiation.;

Longshu 3 was developed from mutants of Yanshu 5 by means of meristem-tip culture,which was a successful attempt on variation breeding by clone of somatic cell.