论西藏蒿属植物区系

<正> In Xizang there are 57 species and 6 varieties under the genus Artemisia Linn, which can be divided into 2 subgenera and 6 sections (see P. 82-85).Sect. Absinthium of the genus Artemisia is possibly the most primitive, because the heads are bigger and the flowers on a head are numerous, over 40-100- The inner most flowers of the disk are sterile, the corolla of the outer flower (margine) is similar to the inner ones with 4 (not 2) corolla-teeth. Sometimes there are sterile androecia in the outer flowers. The receptacle is covered with hairs which are developed from the scales in the species of Tribus Heliantheae. Sect. Abrotanum arising from Sect. Absinthium is the intermediate with glabrous receptacle, and the advanced Sect. Artemisia may have arisen from Abrotanum. In this Sect, heads are small and flowers on each head are not very many (< 20). In South-West China (a plant refuge in the Age of Ice of the Quaternary), Sect. Viscidipubes Y. R. Ling may have arisen from Sect. Artemisia or Sect. Abrotanum