Ferns and Fern Allies of the Central Yukon Valley

Abstract

The following list of ferns and fern allies has been compiled from my own collections of various summers in the vast, mostly unglaciated region of mountains, valleys, rivers, and creeks that form a part of the Yukon River drainage system, and from specimens of other collectors preserved in the Gray Herbarium. These I have supplemented by all published lists of collections known to the writer. The most complete the catalogue of specimens in Hulten's monumental Flora of Alaska and Yukon. l To this work I am much in debt, and also to Anderson's Flora of Alaska and Adjacent Parts of Canada,2 especially for being enabled thereby to include two species in our district which I could not have done otherwise. For convenience I have followed Hulten's divisions and boundaries, according to which the Central Yukon River District is taken to include the basin of the Yukon River from the mouth of Stewart R. to the mouth of Koyukuk R., as well as the basins of the large tributaries of the Tanana R. and Porcupine R. The upper parts of the tributaries of the Tanana R. from the south are regarded as belonging to the Alaska Range District