Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA (11/30/12):
Helianthus giganteus
FAMILY
Asteraceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Helianthus giganteus
FAMILY
Asteraceae
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (1968) 179-65-021:
Helianthus giganteus
FAMILY
Asteraceae
COMMON NAME:
Tall Sunflower, Swamp Sunflower, Tuberous Sunflower
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USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_hegi_001_lvd
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JK Marlow jkm140917_832
September Greenville County SC
Swamp Rabbit Trail
Phyllaries not conspicuously graduated & imbricate, usually loose or spreading, per Weakley's Flora.
COMPARE
involucral bracts of Sunflowers
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JK Marlow jkm140917_833
September Greenville County SC
Swamp Rabbit Trail
Stem hairy, reddish; leaves narrowly lanceolate, tapering to a short petiole, per Wildflowers of the Southern Mountains.
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JK Marlow jkm140917_836
September Greenville County SC
Swamp Rabbit Trail
Leaves triplinerved (with a prominent lateral pair of veins near the base), per Weakley's Flora.
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JK Marlow jkm140917_837
September Greenville County SC
Swamp Rabbit Trail
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JK Marlow jkm140917_838
September Greenville County SC
Swamp Rabbit Trail
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JK Marlow jkm140917_840
September Greenville County SC
Swamp Rabbit Trail
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JK Marlow jkm140917_842
September Greenville County SC
Swamp Rabbit Trail
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JK Marlow jkm140917_843
September Greenville County SC
Swamp Rabbit Trail
May grow to 10', but flowers are proportionately small, often < 2" diameter, per Wildflowers of the Southern Mountains.
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Richard and Teresa Ware rtw_h_giganteus_7
October
Ray florets 12-20, oft pale yellow. Disc florets' lobes yellow; anthers dark, per Flora of North America.