ring species
1.By comparative anatomical observation of the roots and rhizomes of 5 species inGlycyrrhiza,it was found that mature roots consist of periderm and vascular tissue,thedifferences in the species relate to the number of cells of cork layer,the arrangement andthe ring number of bast flber strands,the distribution frequency of vessel,the pattern ofray,and the state of the scatered distribution of the primary xylem in the center of theroots etc.
2.About 80 species from the tropics to the temperate zone,and also in South East Asia and the Pacific region.In Japan C.sinennas of the same genus being ring porous wood,while those from the tropics diffuse porous,wood Much imported from Papua New Guinea,Solomon and Irian Jaya,and a little from other areas.
