OF THE CAROLINAS & GEORGIA

Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Helianthus laetiflorus   FAMILY Asteraceae   Go to FSUS key


SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Helianthus ×laetiflorus [pauciflorus × tuberosus]   FAMILY Asteraceae

SYNONYMOUS WITH Flora of North America
Helianthus ×laetiflorus

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-65-009:
Helianthus laetiflorus   FAMILY Asteraceae

SYNONYMOUS WITH Gray's Manual of Botany (Fernald, 1950)
Helianthus laetiflorus var. laetiflorus

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Helianthus laetiflorus

 

COMMON NAME:
Showy Sunflower, cheerful sunflower


         To see larger pictures, click or hover over the thumbnails.

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913    pnd_hesc13_001_lvd

        

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm130713_426

July    Greenville County    SC

Leaves w a prominent lateral pair of veins near the base, petiole 1-5 cm long, per Weakley's Flora.

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm130713_431

July    Greenville County    SC

Leaf underside.

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm090824_001

August    Greenville County    SC

Roadside

Stems erect, 1-2.5m tall; lower internodes ~ 3-10cm, upper considerably longer, per Vascular Flora of the Carolinas.

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm090824_007

August    Greenville County    SC

Roadside

Leaves opposite, lanceolate to lance-ovate, serrate, pubescent and scabrous, per Vascular Flora of the Carolinas.

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm120814_518

August    Greenville County    SC

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm120814_520

August    Greenville County    SC

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm210905_3331

September    Greenville County    SC

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm210905_3332

September    Greenville County    SC

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm210905_3334

September    Greenville County    SC

Ray florets 15-20; disc florets w reddish lobes, at least tips; anthers dark, per Flora of North America.

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm210905_3337

September    Greenville County    SC

Phyllaries conspicuously graduated and imbricate, usually appressed, per Weakley's Flora.


click here to see other plants that look similar to this COMPARE involucral bracts of Sunflowers

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm210905_3341

September    Greenville County    SC

image of Helianthus laetiflorus, Showy Sunflower, cheerful sunflower

JK Marlow    jkm210905_3344

September    Greenville County    SC

Stems scabrous and spreading pubescent, somewhat glabrous above, per Vascular Flora of the Carolinas.

 

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Helianthus laetiflorus   FAMILY Asteraceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Helianthus ×laetiflorus [pauciflorus × tuberosus]   FAMILY Asteraceae

SYNONYMOUS WITH Flora of North America
Helianthus ×laetiflorus

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-65-009:
Helianthus laetiflorus   FAMILY Asteraceae

SYNONYMOUS WITH Gray's Manual of Botany (Fernald, 1950)
Helianthus laetiflorus var. laetiflorus

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Helianthus laetiflorus

 

Find by SCIENTIFIC NAME:

3537

Forb
Perennial

Native: west of the Carolinas & Georgia

Uncommon (rare in GA, rare in Mountains)

Habitat: Disturbed areas; introduced from farther west, per Weakley's Flora

map
Click here to see a map, notes, and images from Weakley's Flora of the Southeastern US.

Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)

LEAVES:
Simple
Opposite

FLOWER:
Summer/Fall
Rays: Yellow
Disc: Yellow with dark lobes
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!



 


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