The distribution area of some plants is not their most suitable distribution range. When they are introduced to new areas, they can play their greater potential. Zun piece is small, lanceolate, light brown, with 5 purple brown veins, and the petals are short and wide; The cleft lip is not obvious, and the apex droops and rolls back. The flowering period is from January to March, and a few flowers in autumn. It is mainly distributed in Fujian, Taiwan, Hainan, Guangdong, Guangxi, Yunnan, Sichuan and other provinces in China.

This is because the historical ecological conditions experienced by the Taohua meso strain group in the process of evolution are much more complex than that of the North China strain group. Sometimes the diameter is 10-20 cm, the name is zunpian 5, and the green flowers are thin 5 or double. Self color. Light red to dark red, oval in shape, often 2 rooting or notched at the nape, leathery disk, cup-shaped, red, carpel 5. Densely pilose, the upper cone is ovate or ovate, and densely yellow colored hair. The flowering period is April and the packing period is June.

Therefore, the analysis of historical ecological conditions of plants is not only a necessary supplement to the introduction principle of "adapting to the current ecological conditions", but also can broaden the thinking of introduction work, which is conducive to our correct selection of introduction objects. Jingshixi (1984) proposed that some plant species whose distribution area is far away from its origin center may have a wide range of genetic adaptation. The introduction should adhere to the principle of "both positive and cautious".

Investigate the distribution range of introduced materials, and the above ecological principle analysis of introduction emphasizes the importance of ecological conditions to the success or failure of introduction, but on the other hand, the similarity of ecological conditions cannot be overemphasized when introducing, because the success of introduction is also related to the following factors: plant species, the size of the adaptation range of varieties, and the introduction of varieties with wide adaptability to regions with different latitudes and different climatic conditions is still easier to succeed.