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CCDB → Angiosperms → Compositae → Croptilon → Haplopappus rigidifolius E. B. Sm.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Haplopappus rigidifolius E. B. Sm. | Croptilon rigidifolium (E. B. Sm.) E. B. Sm. | 4 | IPCN65 | Smith 1965c | ||
| ! | Haplopappus rigidifolius E. B. Sm. | Croptilon rigidifolium (E. B. Sm.) E. B. Sm. | 5 | IPCN66 | E. B. Smith 1966a | ||
| ! | Haplopappus rigidifolius E. B. Sm. | Croptilon rigidifolium (E. B. Sm.) E. B. Sm. | 10 | Fedorov, 1974 | Smith E. B. 1965, 1966 |