Abstract: Kolkwitzia amabilis,an endemic species to China ,we studied reproductive biology characteristics of itthrough paraffin sectioning and scanning electron microscopy .That contains :the characteristics of its megasporogenesis anddevelopment of the female gametophyte ;the characteristics of development of the seed and the quantity movement of theseed among its development .The results showed that the ovule was anatropous,unitegmic and tenuinucellate type ;themegaspore develop into a linear tetradas .The chalazas megaspore were a functional one ,which develops into a polygonumtype of embryo sac .The embryological characteristics of K .amaabilis were very similar to those of Caprifoliaceae .Theembryo was depauperatus and remains at torpedo -stage embryo in the seed of it,possibly ,which was afterripening phenomenonof the seed .The rate of abortive seed was 61 .86 %, and it perhaps major unit causation that affect breeding potentialof Kolkwitzia amabilis .And it may be the major causation of that it′s rare and isolated island shape distribution .

Key words: Rareplant, Kolkwitziaamabilis, Reproductivebiology, Development

CLC Number: 

• Q948.2