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Weeds of South-West Asia in North America with special reference to the Cruciferae

Published online by Cambridge University Press:  05 December 2011

Reed C. Rollins  and
Ihsan A. Al-Shehbaz
Reed C. Rollins
Affiliation:
Harvard University, Cambridge, Massachusetts 02138, U.S.A.
Ihsan A. Al-Shehbaz
Affiliation:
Harvard University, Cambridge, Massachusetts 02138, U.S.A.
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Synopsis

Weeds strongly connect the present-day floras of N America and SW Asia because 85·2% of the Old World herbaceous weeds now present on the N American continent are also present in SW Asia. But surprisingly only 1·5% had their origin strictly in SW Asia. The Compositae (69), the Cruciferae (52), and Gramineae (71) far outrank any other family in the number of herbaceous weed species. Evidence from such genera of the Cruciferae as Alyxsum and Brassca suggests that some of the more recently arrived weeds in the American west are pre-adapted to arid areas, for they have penetrated the open, undisturbed deserts in great numbers. This pre-adaptation may have taken place in SW Asia whence the species were probably introduced to America. Considering N America empty of Old World weeds before modern man arrived, could evidence be found that any assortative segregation has taken place here over time? This seems to have happened among the species of Carduria, but not along geographic lines. Rather, they seem to have sorted away from each other on an ecological basis, perhaps because of pre-adaptation to different environmental circumstances.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 89: Plant Life of South-West Asia , 1986 , pp. 289 - 299
Copyright
Copyright © Royal Society of Edinburgh 1986

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