Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA (11/30/12):
Helianthus decapetalus
FAMILY
Asteraceae
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Thinleaf Sunflower at Vascular Plants of North Carolina.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Helianthus decapetalus
FAMILY
Asteraceae
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-65-013:
Helianthus decapetalus
FAMILY
Asteraceae
COMMON NAME:
Thinleaf Sunflower, Forest Sunflower
To see larger pictures, click or hover over the thumbnails.
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USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_hede_001_lvd
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JK Marlow jkm140809_372
August Greenville County SC
Swamp Rabbit Trail
The tips of its leaf blades are unusually long and slender, per www.illinoiswildflowers.info.
)
JK Marlow jkm140809_373
August Greenville County SC
Swamp Rabbit Trail
Leaf base widely cuneate or truncate, petioles oft obscured by decurrent blade, per Vascular Flora of the Carolinas.
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JK Marlow jkm140809_374b
August Greenville County SC
Swamp Rabbit Trail
Longer phyllaries usually exceeding disk by half their length+, apex acuminate, per Weakley's Flora.
COMPARE
involucral bracts of Sunflowers
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JK Marlow jkm140809_379
August Greenville County SC
Swamp Rabbit Trail
The disk is small compared to the rays, which may be 1.5" long, per Wildflowers of the Southern Mountains.
)
JK Marlow jkm140823_022
August Greenville County SC
Swamp Rabbit Trail
Ray florets 8-12; disc florets lobes yellow; anthers ~ dark brown to black, per Flora of North America.
)
JK Marlow jkm140823_025
August Greenville County SC
Swamp Rabbit Trail
The floral bracts are unusually long and slender, per www.illinoiswildflowers.info.
)
JK Marlow jkm140823_027
August Greenville County SC
Swamp Rabbit Trail
Leaf abaxial faces ± scabro-hispidulous, relatively sparsely gland-dotted, per Flora of North America.
)
JK Marlow jkm140823_029
August Greenville County SC
Swamp Rabbit Trail
Upper stems have short bristly hairs; lower glabrous, sometimes glaucous, per www.illinoiswildflowers.info.
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Keith Bradley kab_h_decapetalus_2895
August Macon County NC
Nantahala National Forest
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JK Marlow jkm170914_0447
September Haywood County NC
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JK Marlow jkm170914_0450
September Haywood County NC
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JK Marlow jkm170914_0452
September Haywood County NC
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JK Marlow jkm121024_667
October Cherokee County NC
Murphy River Walk
Intergrades with H. strumosus, particularly in the southern Appalachians, per Flora of North America.
WEAKLEY'S FLORA (11/30/12):
Helianthus decapetalus
FAMILY
Asteraceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Helianthus decapetalus
FAMILY
Asteraceae
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-65-013:
Helianthus decapetalus
FAMILY
Asteraceae
646
Forb
Perennial
Native to the Carolinas & Georgia
Documented growing wild in GA NC SC
Common (rare in Coastal Plain, uncommon in GA Mtns, rare in GA Piedmont)
Look for it in mesic woodlands and forests, per Weakley's Flora
Click here to see a more detailed map from University of North Carolina at Chapel Hill Herbarium,
or click here to see a map from SERNEC, a consortium of southeastern herbaria.
LEAVES:
Simple
Opposite, or the upper alternate
FLOWER:
Summer/Fall
Rays: Yellow
Disc: Yellow
Disc flowers bisexual & fertile/ Ray flowers pistillate but sterile
Inferior ovary
FRUIT:
Summer/Fall
Brown
Achene
TO LEARN MORE about this plant, look it up in a good book!
- Newcomb's Wildflower Guide p388
- Southern Appalachian Wildflowers p084
- Wildflowers of the Atlantic Southeast p298
- Wildflowers of the Eastern United States p124
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians p351
- Wildflowers of the Southern Mountains p192