By Rexford Daubenmire
Describes and translates the average plants of North the USA and its improvement via time.
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Additional resources for Plant Geography. With Special Reference to North America
East of Hudson's Bay vascular plants requiring nothing more special than a rooting medium of loose mineral material are restricted in at least their local Barriers to Migration 29 distribution as a result of glaciation having scoured away nearly all loose material down to bedrock. 2 76 Daylength An interbreeding plant population often tends to become genetically attuned to the annual cycle of daylength variation at any latitude where it persists for a long time. Responses to daylength then serve as a timing mechanism keeping the annual cycle of phenologic phases synchronized with appropriate segments of the annual cycle of climate.
They have disseminules capable of floating for long periods in salt water and then producing seedlings adapted to saline sands of wave-beaten coastlines. The abundance of wood-boring insects on oceanic islands lends strong support to a hypothesis that some viable seeds may also have crossed salt water by rafting. Seeds entrapped in small pockets of soil surrounded by roots of trees could be carried long distances by a floating log, then be cast upon a shore where the log could rot. Floating masses of land vegetation have been observed 160 km out from the mouth of the Ganges River.
1 36 To account for their failure to spread from this limited area despite the opportunity presented by some 11,000 years of ice-free environment, Fernald hypothesized that the severe stresses of glaciation allowed only a few biotypes to find suitable habitats to compensate for the climatic adversity, so that later when climates improved the survivors did not have sufficient versatility to expand into the rich mosaic of new habitats as they appeared. In addition to this development of disharmony between the survivors and the new environments, the species would have needed to possess sufficient genetic diversity that selection could shift progressively and so provide new ecotypes adapted to the still different environments encountered during range expansion.