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As a strictly geographical concept, sympatric speciation is defined as one species diverging into two while the ranges of both nascent species overlap entirely – this definition is not specific enough about the original population to be useful in modeling. [3]
Hybridization among poplars is common where ever populations overlap, however the degree of introgression varies greatly depending on the species. One study exploring the extent of introgression among three species of poplar trees (P. balsamifera, P. angustifolia and P. trichocarpa) conducted along the Rock Mountain range in the U.S. and Canada ...
The species can also be distinguished by habitat: where the ranges overlap, common hackberry occurs primarily in upland areas, whereas sugarberry occurs mainly in bottomland areas. [3] Sugarberry's range extends from the Southeastern United States west to Texas and south to northeastern Mexico. [2] It is also found on the island of Bermuda. [4]
There is evidence that introgression is a ubiquitous phenomenon in plants and animals, [9] [10] including humans, [11] in which it may have introduced the microcephalin D allele. [ 12 ] It has been proposed that, historically, introgression with wild animals is a large contributor to the wide range of diversity found in domestic animals, rather ...
[a] It is a naturally occurring hybrid of sour cherry, Prunus cerasus, and dwarf cherry, Prunus fruticosa, occasionally found where their ranges overlap. Like its parents, it is a tetraploid with 32 chromosomes. It is forming a hybrid swarm with, and threatening to extirpate, P. fruticosa in much of its western range through genetic pollution. [4]
Although annual plants die after one season, not all annual plants truly lack overlapping generations. Many annual plants have seed banks containing dormant seeds that remain dormant for at least one year. This makes overlapping generations possible in annual plants. [6] N.B domestication of annual plants has led to a reduction of seed dormancy.
Arbutus unedo and A. andrachne hybridise naturally where their ranges overlap; the hybrid has been named Arbutus × andrachnoides (syn. A. × hybrida, or A. andrachne × unedo), [10] inheriting traits of both parent species, though fruits are not usually borne freely, and as a hybrid is unlikely to breed true from seed. It is sold in California ...
However, the shoots, seeds or leaves of several species were used as food by Native Americans, and the plant also had some medicinal uses. The species are hard to distinguish, and their ranges overlap; furthermore, several of them have large numbers of slightly different varieties, and several of the species hybridise naturally.