Chromosome Races of Gaillardia pulchella (Asteraceae)

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Abstract
Gaillardia pulchella Foug. is subdivided into partially interfertile cytotypes which are in some cases morphologically recognizable. The greatest morphological and cytological variation occurs in the southern and eastern portions of the species range. The evolutionary history of the species cannot be determined from the cytological information presented here although paleoclimatic information suggests the species or its ancestral form would have occupied areas to the south or west of the present distribution during the late Pleistocene-Recent climatic shifts.