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

Abstract

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.

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Correspondence to Lawrence R. Heckard.

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Research was supported in part by National Science Foundation Grants GB 35202 and BMS 75-15972.

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Heckard, L.R., Chuang, TI. Chromosome numbers, polyploidy, and hybridization in castilleja (scrophulariaceae ) of the Great Basin and Rocky Mountains. Brittonia 29, 159–172 (1977). https://doi.org/10.2307/2805849

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Keywords

  • Chromosome Number
  • BRITISH COLUMBIA
  • Chromosome Count
  • Great Basin
  • Hybrid Swarm