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CCDB → Angiosperms → Compositae → Helianthus → Helianthus praecox Engelm. & A. Gray
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Helianthus praecox subsp. praecox | Helianthus praecox Engelm. & A. Gray | 34(1) | Asteracea | Vanzela et al. 2002 Genetica | |||
| Helianthus praecox Engelm. & A. Gray | Helianthus praecox Engelm. & A. Gray | 17(1) | Asteracea | Sossey-Alaoui, K. et al. 1998 Theor. Appl. Genet. | |||
| Helianthus praecox subsp. praecox | Helianthus praecox Engelm. & A. Gray | 17(1) | Asteracea | Chandler et al. 1986 Syst. Bot. | |||
| ! | Helianthus praecox Engelm. & A. Gray | Helianthus praecox Engelm. & A. Gray | 34(1) | Asteracea | Willson et al. 2005 | ||
| Helianthus praecox Engelm. & A. Gray | Helianthus praecox Engelm. & A. Gray | 17 | IPCN online | Chandler, J. M., C. C. Jan & B. H. Beard. 1986. Chromosomal differentiation among the annual Helianthus species. Syst. Bot. 11: 354–371. | |||
| Helianthus praecox Engelm. & A. Gray | Helianthus praecox Engelm. & A. Gray | 34 | IPCN online | Mohan, G. S. R. & A. Seetharam. 2005. Studies on genetic relationships among cultivated and wild sunflowers through RAPD markers. Cytologia 70: 267–273. | |||
| Helianthus praecox Engelm. & A. Gray | Helianthus praecox Engelm. & A. Gray | 34 | IPCN online | De Paula Wilson. 2005. Functionality of major and minor 45S rDNA sites in different diploid wild species and varieties of sunflowers. Caryologia 58(4): 374–379. | |||
| Helianthus praecox subsp. praecox | Helianthus praecox Engelm. & A. Gray | 34 | eFlora | ||||
| ! | Helianthus praecox subsp. praecox | Helianthus praecox Engelm. & A. Gray | 34 | C-values database | Sims LE, Price HJ. 1985. Nuclear DNA content variation in Helianthus (Asteraceae). American Journal of Botany 72: 1213-1219. |