, Volume 29, Issue 2, pp 159–172 | Cite as

Chromosome numbers, polyploidy, and hybridization in castilleja (scrophulariaceae ) of the Great Basin and Rocky Mountains

  • Lawrence R. Heckard
  • Tsan-Iang Chuang


Chromosome numbers are reported for 190 collections ofCastilleja of the Great Basin-Rocky Mountains and adjacent regions in western North America. Polyploidy has played a major role in evolu tion of this genus. Of the 35 taxa represented, 14 are exclusively diploid (n =12). The remaining 21 taxa exhibit polyploidy: eight are tetraploid only, two are octopIoid only, while 11 of the more wide-ranging species have two or more levels of polyploidy. BothC. rhexifolia andC. sulphured have diploid, tetraploid, and octoploid races while the widespreadC. miniata has four (2x, 4x, 8x, and 10x). Where appropriate, the role of polyploidy and hybridization inCastilleja evolution and their relevance to taxonomy are discussed for individual species.


Chromosome Number BRITISH COLUMBIA Chromosome Count Great Basin Hybrid Swarm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© The New York Botanical Garden 1977

Authors and Affiliations

  • Lawrence R. Heckard
    • 1
  • Tsan-Iang Chuang
    • 2
  1. 1.Jepson HerbariumUniversity of CaliforniaBerkeley
  2. 2.Department of Biological SciencesIllinois State UniversityNormal

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