Cytotaxonomic studies of the closely alliedDraba cana, D. cinerea, andD. groenlandicain Canada and Alaska

摘要

The cytotaxonomy of three closely related species ofDrabais discussed and a key is given:D. canaRydberg (2nensp;=ensp;32),D. cinereaAdams (2nensp;=ensp;48 and 64), andD. groenlandicaE. Ekman (2nensp;=ensp;64). Evidence is presented to show that the nameD. lanceolataRoyle has been misapplied to plants that should be calledD. cana.Scanning electron microscope examinations were made of hairs on leaves and silicles and the value of the different types of hairs as morphological characters in the taxonomy ofDrabaspecies is stressed.