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CCDB → Angiosperms → Compositae → Rayjacksonia → Haplopappus phyllocephalus DC.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Haplopappus phyllocephalus DC. | Rayjacksonia phyllocephala (DC.) R. L. Hartm. & M. A. Lane | 6 | IPCN online | Semple, J. C. 1980. In Chromosome number reports LXVII. Taxon 29: 357–358. | |||
| Haplopappus phyllocephalus DC. | Rayjacksonia phyllocephala (DC.) R. L. Hartm. & M. A. Lane | 6 | IPCN73-74 | WATSON, T.J., Jr. 1973. Chromosome numbers in Compositae from the southwestern United states. Southw. Naturalist 18: 117-124. | |||
| Haplopappus phyllocephalus DC. | Rayjacksonia phyllocephala (DC.) R. L. Hartm. & M. A. Lane | 12 | Fedorov, 1974 | Jackson R. C. (D. n. 1960), 1966 dec |