Biology:Helianthus praecox
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Short description: Species of sunflower
| Helianthus praecox | |
|---|---|
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Helianthus |
| Species: | H. praecox
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| Binomial name | |
| Helianthus praecox Engelm. & A.Gray
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| Synonyms[1] | |
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Synonymy
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Helianthus praecox is a North American species of sunflower known by the common name Texas sunflower. It is endemic to Texas . Most of the populations are either along the Gulf Coast or in the Río Grande Valley.[2]
Helianthus praecox grows on sandy soils and coastal prairies. It is an annual herb up to 150 cm (60 inches or 5 feet) tall. One plant usually produces 1-3 flower heads, each containing 11-16 yellow ray florets surrounding 35 or more red or purple disc florets.[3]
- Helianthus praecox subsp. hirtus (Heiser) Heiser - near Carrizo Springs in Dimmit County
- Helianthus praecox subsp. praecox - sandy soils along the coast in Galveston County + Brazoria County
- Helianthus praecox subsp. runyonii (Heiser) Heiser - Coastal prairies (from Calhoun County to Cameron County) and Río Grande Valley (from Webb County to Cameron County)
References
- ↑ 1.0 1.1 The Plant List, Helianthus praecox Engelm. & A.Gray
- ↑ Biota of North America Program 2014 county distribution map
- ↑ 3.0 3.1 Flora of North America, Helianthus praecox Engelmann & A. Gray, 1847. Texas sunflower
- ↑ Billie L. Turner. 2014. Taxonomy of the Texas sunflower (Helianthus praecox) Asteraceae. Phytologia (April 1, 2014) 96(2) 107 includes county-level range map for all 3 subspecies
External links
Wikidata ☰ Q12212021 entry
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