Recent Human Disturbance Research Articles

Anogeissus Groves on Abandoned Village Sites in the Mole National Park, Ghana

Anogeissus Groves on Abandoned Village Sites in the Mole National Park, Ghana

The Asters of Minnesota: A Floristic Study

In this paper we intend to present a companion to our study of the goldenrods of Minnesota (Am. Midl. Nat. 33: 244-253. 1945.). Our work is floristic, not monographic; no new names or combinations are here proposed. The basis for admission of entities into this treatment is the presence of specimens from Minnesota in the herbarium of the University of Minnesota or the New York Botanical Garden. A brief discussion of the phytogeographic regions of the state will be found in our previous paper. The taxonomic difficulty of the genus Aster is so well known that it needs no reiteration here. It now seems established that much of the difficulty is due to natural hybridization, in some cases amplified by recent human disturbance. A disproportionate number of hybrid intermediates have found their way into herbaria, and some of them have been given specific names. No attempt is made to provide for these in the key; some of the more common or betterknown ones are discussed in the text.