Systematics of the Eupatorium album Complex (Asteraceae) from Eastern North America
2011; American Society of Plant Taxonomists; Volume: 36; Issue: 4 Linguagem: Inglês
10.1600/036364411x605083
ISSN1548-2324
Autores Tópico(s)Plant Taxonomy and Phylogenetics
ResumoAbstract Analysis of ITS sequence data showed unexpected complexity for Eupatorium album and E. petaloideum, a closely related species pair from eastern North America that has been considered to form a single species. The two species consistently differed in ITS sequence by seven to eight bp as well as a one bp indel, and detailed analysis revealed little intraspecific variation. The ITS sequences of other samples that had similar but slightly differing morphology and were pollen sterile gave several patterns involving bp or indel polymorphisms that indicated that they were of hybrid derivation. Based on differences in leaf and phyllary shape and glandular trichome distribution it was possible to delimit the individual hybrid combinations from one another and from their progenitor species. Material previously called E. album from the western part of its range is of hybrid origin from E. album and E. lancifolium, and is described here as Eupatorium sullivaniae. Material from the northeastern part of the ra...
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