Author(s)： Shaoyong Yang, Fan Du, Dan Zhou, Zhaoqiang Hou
On the investigation of the biodiverisities of plant resources of Nujiang River Valley in Nujiang Autonomous Prefacure, Yunnan Province, China, a new species of Ehretia has been described and illustrated as Ehretia retroserrata in the arid valley of Nujiang according to the new living state of erect shrub and the characteristics of serrate leave margin, retrose, apiculate, endocarp divided at maturity into 4 1-seeded pyrene and serrate leaves margins by comparison with other species of the genus Ehretia.
There are 14 species in genus Ehretia in China. Most of them are arbors more than 10 meters high. There are 7 species in Yunnan Province and all of them are arbors. Among all the species of genus Ehretia in China, only E. changjiang and E. asperula are climbing shrubs in Hainan Province. On the identification research of Eheria, firstly, 2 groups have been classified according to the differences between “serrate leaves; endocarp divided at maturity into 2 2-seeded
pyrenes” and “entire leaves margins, endocarp divided at maturity into 4 1-seeded pyrenes”, so that E. acuminata, E. corylifolia and E. dicksonii have been classified as the 1st group and the 2nd group includes E. confinis, E. tsangi, E. dunniana and E. longiflora etc. Secondly, in the 1st group, according to the differences of “glabrous leaves, antrorse, apiculate teeth; corolla lobes longer than tube; drupes 3 – 4 mm in diam” and “abaxially pubescent leaves, spreading teeth, not apiculate; corolla lobes shorter than tube; drupes 6 – 15 mm in diam”, E. acuminata and E. corylifolia have been classified as 2 species. E. changjiang and E. asperula are only climbing shrubs found in Hainan Province, but their leaves are leathery and have entire margins and pubescent cymes -. Another species of Japan, E. microphylla has the unique characteristic of long obovate leaves with white seta and white basal plate.
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