| 1. The influence upon seed germination of exposure to winter temperatures was studied in a large number of native eastern American plants, mostly species of northward distribution. 2. Tables are presented showing the germination behavior of seeds in 141 species, both after exposure and when not exposed, figures being given in each case for number of seeds used, number of seeds germinating, and number of days required for germination. 3. The conclusion is reached that winter refrigeration of seeds, in its effect both upon the number germinating and upon the length of the germination period, may be an ecological factor of much importance in relation to the northward distribution of plants. 4. Attention is called to the persistence of the dwarf habit of their parents in plants of Campanula rotundifolia which were grown from seed produced by the alpine form of this species, growing on Mount Monroe, in the White Mountains. |
The Influence of(file pdf, 964 KB)
