In the present paper,the chromosome numbers of three species of Omphalogramma from Yunnan,China are reported for the first time.The results are formulated as follows: O.delavayi 2n=48, O.souliei 2n=96, O.forrestii 2n=48.
Primula interjacens Chen, an endemic and rare species to China, is restrictively distributed in Mt. Wuliangshan of Yunnan Province. Only three populations are found. The species has been fallen into endangered condition. Its present state of distribution, biological and ecological characteristics are investigated. In addition, the factors causing this species endangered and conservation strategies are analyzed briefly.
