Life Sciences Commons^™

Early Pollen Forcing In A White X Black Spruce Hybrid And Its Parental Species, Lawson L. Winton

Journal of the Minnesota Academy of Science

Viable pollen was successfully forced from winter-collected cuttings of white and black spruce, as well as of a hybrid of them. The natural time difference in flowering was overcame, thus providing a tool for interbreeding these species. During forcing, and naturally on the trees, pollen always shed from white spruce first, then the hybrid and finally from black spruce. Using departures from long-range weather averages, a heat-requirement difference was postulated for each species to account for the time difference in their flowering.

Plants And Asthma, Robert Dunlop Royce

Journal of the Department of Agriculture, Western Australia, Series 4

ASTHMA is defined in the dictionary as being a disease characterised by recurring attacks of difficulty in breathing, and the causes are stated to include the inhalation of dust, or the odour of plants, flowers or animals.

Hay fever is a similar condition and this too, is caused by plants, usually at the time of flowering, when large quantities of pollen are produced.

A Comparison Of The Hyde And Durham Air-Borne Pollen Collecting Shelters, A. Orville Dahl, John R. Rowley

Journal of the Minnesota Academy of Science

No abstract provided.

A Preliminary Pollen Study From A Fossil Bison Site In St. Paul, Minnesota, Joanne Rowley

Journal of the Minnesota Academy of Science

No abstract provided.

Verical Migration Of A Spherical And Aspherical Pollen In A Sphagnum Bog, John R. Rowley, Joanne Rowley

Journal of the Minnesota Academy of Science

No abstract provided.

Pollen Evidence, A. Orville Dahl

Journal of the Minnesota Academy of Science

No abstract provided.