Chromosome Numbers and Polyploidy in Castilleja (Scrophulariaceae)

Chromosome numbers are reported for 155 collections of Castilleja representing 54 taxa. The basic haploid number of 12 was found in 34 taxa, but 10 of these also had one or more polyploid levels. The remaining 20 species were strictly polyploid in one or more levels (4X, 6X, 8X, 10X, 12X). The wides...

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Bibliographic Details
Published in:Brittonia 1968-07, Vol.20 (3), p.212-226
Main Author: Heckard, Lawrence R.
Format: Article
Language:English
Subjects:
Biological taxonomies
Canyons
Chromosomes
Crater lakes
Diploidy
Genetic hybridization
Plants
Ploidies
Polyploidy
Taxa
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Summary:Chromosome numbers are reported for 155 collections of Castilleja representing 54 taxa. The basic haploid number of 12 was found in 34 taxa, but 10 of these also had one or more polyploid levels. The remaining 20 species were strictly polyploid in one or more levels (4X, 6X, 8X, 10X, 12X). The widespread occurrence of polyploidy, along with hybridization, is believed to be largely responsible for the complex morphological variation found within the genus. Specific examples of the role of polyploidy and hybridization in creating this variation are discussed for the following species complexes: C. affinis, C. applegatei, C. miniata, C. peckiana.
ISSN:0007-196X
1938-436X
DOI:10.2307/2805444