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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Duffield, W. J. 1972. Pollination ecology ofCastilleja in Mount Rainier National Park. Ohio J. Sci.72: 110–114.
Greenman, J. M. 1906. Two new species from northwestern America. Bot. Gaz.42: 146–147.
Heckard, L. R. 1964. Causes of taxonomic complexity inCastilleja. Amer. J. Bot.51: 686 (Abstract).
— 1968. Chromosome numbers and polyploidy inCastilleja (Scrophulariaceae). Brittonia20: 212–226.
Holmgren, N. H. 1971. A taxonomic revision of theCastilleja viscidula group. Mem. New York Bot. Gard.21(4): 1–63.
— 1976. Four new species of MexicanCastilleja (SubgenusCastilleja, Scrophulari aceae) and their relatives. Brittonia28: 195–208.
Löve, A. &D. Löve 1964.In:IOPB chromosome number reports II. Taxon13: 207.
Mulligan, G. A. 1967.In: IOPB chromosome number reports XIV. Taxon16: 567.
Ownbey, M. 1959.Castilleja. In: Hitchcock, C. L., A. Cronquist, M. Ownbey, & J. W. Thompson. Vascular Plants of the Pacific Northwest. Univ. Wash. Publ. Biol. 17(4): 295–326.
Reveal, J. L. &E. L. Styer 1973. Miscellaneous chromosome counts of western American plants—II. Great Basin Naturalist33: 19–25.
Rydberg, P. A. 1907. Studies on the Rocky Mountain flora. XVII. Bull. Torrey Bot. Club34: 35–50.
Taylor, R. L. 1967.In: IOPB chromosome number reports XIII. Taxon16: 459.
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
- Chromosome Number
- BRITISH COLUMBIA
- Chromosome Count
- Great Basin
- Hybrid Swarm