GENUS CODE: HELIA3 GENUS SCIENTIFIC:Helianthus GENUS AUTHORITY: L. GENUS COMMON: Sunflower GENUS SUMMARY: A genus of about 50 species, herbs, of North America. GENUS IDENTIFICATION: GENUS REFERENCES: Schilling in FNA (2006c); Heiser et al. (1969); Cronquist (1980)=SE; Schilling et al. (1998). Key adapted from FNA, SE, RAB, and Heiser et al. (1969).
FAMILY CODE: ASTERA FAMILY SCIENTIFIC:Asteraceae FAMILY AUTHORITY: Dumortier 1822 or COMPOSITAE Giseke 1792 FAMILY COMMON: Aster Family FAMILY SUMMARY: A family of about 1500-1700 genera and 20,000-25,000 species, shrubs, herbs, trees, and vines, cosmopolitan in distribution. FAMILY REFERENCE: Cronquist (1980)=SE throughout family treatment.
INTRO:Erectperennial of savannas, ditches, marshes and other wet habitats. STEMS: Stems branched, leafy and rough-hairy. LEAVES: Leaves alternate (upper) and opposite (lower, short-petiolate to sessile,linear, to 8 in. long, with margins curled under, rough-hairy above and pale green and soft-hairy beneath. INFLORESCENCE: FLOWERS:Composite flowers (heads) solitary or in small clusters, 1 1/2-3 in. wide, consisting of 8-21 yellow ray florets encircling a center disk of reddish to purplish-brown tubular florets. Overlapping, narrow, pointed bracts surround the base of each head. FRUITS:Fruit a dark brown, rounded achene. COMMENTS: HEIGHT: 1-6 ft. DURATION:
Alternate LEAF COMPLEXITY:
Simple LEAF RETENTION: FLORAL CHARACTERISTICS
BLOOM TIME: Sept.-Oct. (frost)
BLOOM COLOR: Yellow
FRUITING PERIOD: DISTRIBUTION
HABITAT TYPE: Bottomlands, Moist forests, Pine savannas
NATIVE RANGE: eastern United States HORTICULTURAL
Plant Sale Text: Easy to grow and extremely showy, swamp sunflower produces upright stems of buttery yellow flowers with dark centers, each flower 2 to 3 inches across. Plant it where it has room to reach its full-grown stature. Swamp sunflower makes a fine cut flower. Butterflies flock to it as a source of nectar, and birds enjoy eating its seeds. Swamp sunflower is seen growing in savannahs and wet meadows, primarily in the coastal plain and lower Piedmont. The Helianthus genus supports up to 73 lepidoptera species.
Bloom Table Text: One of the last of the sunflowers to bloom in autumn, the swamp sunflower is by any measure one of the most glorious.
While most common in the coastal plain in savannas and ditches, it is also seen along roadsides here in the piedmont. Growing to seven feet in height, it is covered with numerous black-eyed, yellow flowers. Swamp sunflower thrives in most soils and is considered an excellent nectar source for butterflies and the seeds are a valuable food source that will guarantee goldfinches visiting your garden.
This information is derived from the U.S. Army Corps of Engineers 2016 National Wetland Plant List, Version 3.3 (Lichvar, R.W., D.L. Banks, W.N. Kirchner, and N.C. Melvin. 2016. The National Wetland Plant List: 2016 wetland ratings. Phytoneuron 2016-30: 1-17. Published 28 April 2016. ISSN 2153 733X). Regions: AGCP-Atlantic and Gulf Coastal Plain, AK-Alaska, AW-Arid West, CB-Caribbean, EMP-Eastern Mountains and Piedmont, GP-Great Plains, HI-Hawaii, MW-Midwest, NCNE-Northcentral and Northeast, WMCV-Western Mountains, Valleys & Coast
SCIENTIFIC NAME: Helianthus angustifolius
COMMON NAME: Narrowleaf Sunflower
SYNONYMY: [= C, FNA, G, GW, Il, K, Pa, RAB, S, SE, Va, W, WH3, WV; > H. angustifolius var. angustifolius - F; > H. angustifolius var. planifolius Fernald - F]
PHENOLOGY: (Jul-) Sep-Oct (-frost).
HABITAT: Savannas, ditches, marshes, other wet habitats.
COMMENTS: Primarily Coastal Plain, from Long Island, NY south to c. peninsular FL and west to TX, irregularly inland to OH, IN, and MO. This plant is very showy when in flower on roadsides, especially in Oct.
RANGE MAP: Helianthus angustifolius.png
Key to Map SymbolsABOUT FAMILY (Weakley Flora) Asteraceae Dumortier 1822 or COMPOSITAE Giseke 1792 (Aster Family) SUMMARY: A family of about 1500-1700 genera and 20,000-25,000 species, shrubs, herbs, trees, and vines, cosmopolitan in distribution. REFERENCE: Cronquist (1980)=SE throughout family treatment.ABOUT GENUS (Weakley Flora) Helianthus L. (Sunflower) SUMMARY: A genus of about 50 species, herbs, of North America. REFERENCE: Schilling in FNA (2006c); Heiser et al. (1969); Cronquist (1980)=SE; Schilling et al. (1998). Key adapted from FNA, SE, RAB, and Heiser et al. (1969).
SERNEC: Find Helianthus angustifolius in Southeast Regional Network of Experts and Collections (if available) UNC SERNEC: Find Helianthus angustifolius in
University of North Carolina Chapel Hill Herbarium - Southeast Regional Network of Experts and Collections (if available)