Features of ontogenesis and morphological structure of the underground organs of Astragalus propinquus Schischk

The paper presents materials on the specifics of development in ontogenesis and formation of morphological structures in perennial polycarpic A.propinquus Schischk. and his vicar species A.membranaceus Fish. and A.mongholicus. Species in life form classification belong to the long rod grassy polycarpic many-headed, with monocarpic shoots elongated type, consistently developing and replacing each other. There are 4 periods in the ontogenesis of the studied species: latency, pregenerativny, generative and postgenerativny. And also ten age phases from the seed (se) to senile individuals (s). Ontogenesis is complete simple. The individual development of the morphological structure of the underground organs of these species is formed sequentially. There are four stages of formation: precaudex development, formation of inversely cone shaped forms caudex, forming wide forms caudex and particulation with incomplete division of caudex, what accords to a certain period of ontogenesis.