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- W2072986020 abstract "Black-fruited hawthorns in North America comprise two taxonomic groups within the genus Crataegus , section Brevispinae and section Douglasianae. The first of these has recently been shown to be monospecific, consisting of the blueberry haw, Crataegus brachyacantha Sarg. & Engelm., of Louisiana and Texas. Crataegus section Douglasianae, however, comprises several taxa in a single clade that is not closely related to section Brevispinae, and that is now one of the best-studied groups of hawthorns at least in North America. Most taxa in the group are found in, or west of, the Rocky Mountains. They include diploids, triploids, and tetraploids that can be ascribed to four or more species that differ in distribution and ecology, thorn morphology, leaf shape, and floral architecture. Diploids are self-incompatible, whereas polyploidy is associated with pseudogamous, gametophytic apomixis and self compatibility. Molecular data suggest that polyploids have arisen repeatedly, both within and from crosses between ploidy levels. We suggest that Crataegus section Douglasianae represents at least two agamic complexes that may serve as models for understanding the biology of, the relationships within, and the appropriate taxonomic treatment of other such groups that may make up much of the rest of the genus." @default.
- W2072986020 created "2016-06-24" @default.
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- W2072986020 date "2008-08-01" @default.
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- W2072986020 title "Black-fruited hawthorns of western North America — one or more agamic complexes?This paper is one of a selection of papers published in the Special Issue on Systematics Research.This paper is dedicated to the memory of the University of Idaho botanist who got us thinking about the complexities of Northwest hawthorns: the late Steven J. Brunsfeld." @default.
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- W2072986020 doi "https://doi.org/10.1139/b08-072" @default.
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