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:Erect, rhizomatous perennial of bog edges, moist thickets and ditches. STEMS: Stems branching in upper 1/3, green or reddish-purple, rough-hairy. LEAVES: Leaves mostly alternate,petiolate, lance-shaped, 2-8 in. long, pinnately veined, with toothed or nearly smooth margins, rough-hairy above and soft-hairy beneath. INFLORESCENCE: FLOWERS:Composite flowers (heads) several in loose clusters; heads 2-3 in. wide, consisting of 10-20 yellow ray florets encircling a center disk of darker yellow tubular florets. Spreading and overlapping hairy, long, narrow bracts surround the base of each head. FRUITS:Fruit a blackish or mottled-brown, flattened, oblong achene. COMMENTS: HEIGHT: 2-10 ft. (occasionally up to 13 ft.) DURATION:
Alternate LEAF COMPLEXITY:
Simple LEAF RETENTION: FLORAL CHARACTERISTICS
BLOOM TIME: Late Jul-Oct
BLOOM COLOR: Yellow
FRUITING PERIOD: DISTRIBUTION
HABITAT TYPE: Bogs/pocosins, Disturbed
NATIVE RANGE: HORTICULTURAL
Plant Sale Text:
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 giganteus
COMMON NAME: Tuberous Sunflower, Swamp Sunflower
SYNONYMY: [= C, F, FNA, G, GW, Il, K, Pa, RAB, S, SE, Va, W, WV; > H. giganteus - S; > H. alienus E.E. Watson - S; > H. validus E.E. Watson - S]
PHENOLOGY: Late Jul-Oct.
HABITAT: Bog edges, moist thickets, ditches.
COMMENTS: NB and ME west to MN, south to n. SC, n. GA, e. and c. TN, c. KY, n. IN, n. IL, and WI.
RANGE MAP: Helianthus giganteus.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 giganteus in Southeast Regional Network of Experts and Collections (if available) UNC SERNEC: Find Helianthus giganteus in
University of North Carolina Chapel Hill Herbarium - Southeast Regional Network of Experts and Collections (if available)