Comprative Studies on Karyotypes of Some Species of Hemerocallis (Liliaceae) Bacteriostasis of Volatile Compounds from Six Perennial Root Flower Plants Chemical constituents in root of Hemerocallis fulva Pollen Protoplast Culture Leading to Embryogenic Divisions in Hemerocollis fufva Polymerziton and Electron Microscopy of Tubulin of Pollens from Hemerocallis fulva in vitro An Ultrastructural Study on Triggering of Cell Division in Young Pollen Protoplast Culture of Hemerocallis fulva L. Developmental anatomy of floral nectaries in three species of monocotylendonous plants Isolation and identification of chemical constituents in Hemerocallis fulva(Ⅱ)