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CCDB → Angiosperms → Compositae → Heterotheca → Heterotheca horrida (Rydb.) V. L. Harms
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Heterotheca horrida (Rydb.) V. L. Harms | Heterotheca villosa var. nana (A. Gray) Semple | 18 | IPCN online | Ward, D. E. 1984. Chromosome counts from New Mexico and Mexico. Phytologia 56(1): 55–60. | ||
| ! | Heterotheca horrida (Rydb.) V. L. Harms | Heterotheca villosa var. nana (A. Gray) Semple | 9II | IPCN online | Semple, J. C. 1985. Chromosome number determinations in fam. Compositae tribe Astereae. Rhodora 87: 517–527. | ||
| ! | Heterotheca horrida (Rydb.) V. L. Harms | Heterotheca villosa var. nana (A. Gray) Semple | 9,18 triploid | IPCN online | Semple, J. C. 1977. Cytotaxonomy of Chrysopsis and Heterotheca (Compositae Astereae): A new interpretation of phylogeny. Canad. J. Bot. 55: 2503–2513. | ||
| ! | Heterotheca horrida (Rydb.) V. L. Harms | Heterotheca villosa var. nana (A. Gray) Semple | 9 | IPCN73-74 | HARMS, V.L. 1974. Chromosome numbers in Heterotheca, including Chrysopsis (Compositae: Asterae), with phylogenetic interpretations. Brittonia 26: 61-69. |