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Taxon:  Helianthus praecox Engelm. & A. Gray



Summary
Genus:
Helianthus
Family:
Asteraceae (alt. Compositae)
Subfamily:
Asteroideae
Tribe:
Heliantheae
Nomen number:
70330
Place of publication:
Boston J. Nat. Hist. 5:221. 1847 (G. Engelmann et al., Pl. lindheim. 1:13. 1845)
Verified:
03/08/2010 ARS Systematic Botanists.
Accessions:
3 (3  active, 1  available) in National Plant Germplasm System.  (Map it)
Other conspecific taxa
Helianthus praecox Engelm. & A. Gray subsp. hirtus (Heiser) Heiser (2 active accession[s])
Helianthus praecox Engelm. & A. Gray subsp. praecox (1 active accession[s])
Helianthus praecox Engelm. & A. Gray subsp. runyonii (Heiser) Heiser (1 active accession[s])
Autonyms (not in current use), synonyms and invalid designations
No images


Reference(s)
  1. Chandler, J. M. et al. 1986. Chromosomal differentiation among annual Helianthus species. Syst. Bot. 11:354-371.
  2. Correll, D. S. & M. C. Johnston. Manual of the vascular plants of Texas. 1970
  3. Dolgova, T. A. et al. 2007. Cytogenetic study of F1 interspecific hybrids of the section Helianthus. Helia 30:51-60.
  4. Dolgova, T. A. et al. 2007. Cytogenetic study of F1 interspecific hybrids of the section Helianthus. Helia 30:51-60.
  5. FNA Editorial Committee. Flora of North America. 1993-
  6. Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):51-54.
  7. Rieseberg, L. H. 1991. Homoploid reticulate evolution in Helianthus (Asteraceae): evidence from ribosomal genes. Amer. J. Bot. 78:1218-1237.
  8. Rieseberg, L. H. 1991. Homoploid reticulate evolution in Helianthus (Asteraceae): evidence from ribosomal genes. Amer. J. Bot. 78:1218-1237.
  9. Rogers, C. E. et al. 1982. Sunflower species of the United States. 13.
  10. Sossey-Alaoui, K. et al. 1998. Evidence for several genomes in Helianthus. Theor. Appl. Genet. 97:422-430.
  11. Timme, R. E. et al. 2007. High-resolution phylogeny for Helianthus (Asteraceae) using the 18S-26S ribosomal DNA external transcribed spacer. Amer. J. Bot. 94:1837-1852.
Common names
English
premature sunflower –
Texas sunflower –
Distribution
order_codeStatusContinentSubcontinentCountryStateNote
1NativeNorthern AmericaSouth-Central U.S.A.United StatesTexas 
Native
Northern America
  • SOUTH-CENTRAL U.S.A.: United States [Texas]
Cite as: USDA, Agricultural Research Service, National Plant Germplasm System. 2025. Germplasm Resources Information Network (GRIN Taxonomy). National Germplasm Resources Laboratory, Beltsville, Maryland.
URL: https://ausgenebank.agriculture.vic.gov.au/gringlobal/taxon/taxonomydetail?id=70330. Accessed 10 December 2025.

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