Hybridization Studies in the Aster Occidentalis (Asteraceae) Polyploid Complex of Western North America

Brittonia ◽  
1983 ◽  
Vol 35 (4) ◽  
pp. 353 ◽  
Author(s):  
Geraldine A. Allen ◽  
Milton L. Dean ◽  
Kenton L. Chambers
Keyword(s):  
North America ◽  
Western North America ◽  
Polyploid Complex

Chromosome Numbers and Evolutionary Patterns in the Aster Occidentalis (Asteraceae) Polyploid Complex of Western North America

Brittonia ◽  
1983 ◽  
Vol 35 (3) ◽  
pp. 189 ◽  
Author(s):  
Milton L. Dean ◽  
Kenton L. Chambers
Keyword(s):  
North America ◽  
Chromosome Numbers ◽  
Western North America ◽  
Polyploid Complex ◽  
Evolutionary Patterns

Chromosome numbers in Antennaria (Asteraceae:Inuleae) from western North America

1986 ◽  
Vol 28 (3) ◽  
pp. 468-475 ◽  
Author(s):  
C. C. Chinnappa
Keyword(s):  
North America ◽  
Chromosome Numbers ◽  
Entire Range ◽  
Western North America ◽  
Polyploid Complex ◽  
Polyploid Species ◽  
Ploidy Levels ◽  
Putative Hybrids

Chromosome numbers were determined for 26 taxa of Antennaria from western North America. These were found to include diploid and polyploid species and their putative hybrids. First counts are reported for A. stenophylla (2n = 28) and A. sedoides (2n = 56). Four polyploid complexes, the A. rosea, A. alpina, A. neodioeca, and A. parvifolia aggregates, were found to have sporophytic chromosomes numbers which included all ploidy levels from diploid (2n = 28) to decaploid (2n = 140). This represents the entire range of euploidy known to occur in the genus. Much of the variation that is encountered in the species of Antennaria is the result of extensive hybridization between diploid and polyploid populations comprised of sexual and partially apomictic individuals, respectively.Key words: Asteraceae, Antennaria, dioecy, agamospermy, polyploid complex.

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