Chromosome Numbers and Polyploidy in Castilleja (Scrophulariaceae)
- 1 July 1968
- journal article
- research article
- Published by Springer Nature in Brittonia
- Vol. 20 (3) , 212-226
- https://doi.org/10.2307/2805444
Abstract
Chromosome numbers are reported for 155 collections ofCastilleja 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.Keywords
This publication has 1 reference indexed in Scilit:
- Chromosome Studies in the Alpine and Subalpine Floras of Mexico and GuatemalaAmerican Journal of Botany, 1962