Gutierrezia sphaerocephala A. Gray | Lane, M. A. 1985. Taxonomy of Gutierrezia (Compositae: Astereae) in North America. Syst. Bot. 10(1): 7–28. | 84-85 | 4, 5 | |
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Gutierrezia sphaerocephala A. Gray | Lane, M. A. 1982. Generic limits of Xanthocephalum, Gutierrezia, Amphiachyris, Gymnosperma, Greenella, and Thurovia (Compositae: Astereae). Syst. Bot. 7(4): 405–416. | 82-83 | 4,5,8 | |
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Gutierrezia sphaerocephala A. Gray | Semple, J. C., J. G. Chmielewski & M. E. Lane. 1989. Chromosome number determinations in fam. Compositae, tribe Astereae. III. Additional counts and comments on generic limits and ancestral base numbers. Rhodora 91: 296–314. | 88-89 | 4II+0-1B | |
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