Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Helianthus decapetalus
FAMILY
Asteraceae
Go to FSUS key
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 Flora of North America north of Mexico, vol. 19-20-21 (2006)
Helianthus decapetalus
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-65-013:
Helianthus decapetalus FAMILY Asteraceae
SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Helianthus decapetalus
INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Helianthus saxicola
COMMON NAME:
Thinleaf Sunflower, Forest Sunflower
To see larger pictures, click or hover over the thumbnails.
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 (Radford, Ahles, & Bell, 1968).
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
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 (Smith, 1998).
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.
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 OF THE SOUTHEASTERN US (4/24/22):
Helianthus decapetalus
FAMILY
Asteraceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Helianthus decapetalus
FAMILY
Asteraceae
SYNONYMOUS WITH
Flora of North America north of Mexico, vol. 19-20-21
Helianthus decapetalus
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-65-013:
Helianthus decapetalus
FAMILY
Asteraceae
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933, 1938)
Helianthus decapetalus
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Helianthus saxicola
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