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):
Ambrosia trifida var. trifida   FAMILY Asteraceae__   Go to FSUS key



INCLUDED WITHIN PLANTS NATIONAL DATABASE:
Ambrosia trifida var. trifida   FAMILY Asteraceae__

INCLUDED WITHIN Flora of North America north of Mexico, vol. 19-20-21 (2006)

Ambrosia trifida

INCLUDED WITHIN VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-02-002:

Ambrosia trifida   FAMILY Asteraceae__

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

Ambrosia trifida

 

COMMON NAME:
Giant Ragweed, Great Ragweed


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

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

USDA / Selected Weeds of the US. 1970    swus_page_369

        

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm140623_235

June    Greenville County    SC

Swamp Rabbit Trail

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    s060617_b

June    Greenville County    SC

Roadside/creekside

Leaves 3(5)-lobed or unlobed, tips acuminate, margins evenly serrate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).


click here to see other plants that look similar to this COMPARE leaves of Giant Ragweed and Sassafras

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

Gill Newberry    gn08_a_trifida_plant

August        

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm130823_485

August    Greenville County    SC

Swamp Rabbit Trail

Leaves usually with 3-5 deep lobes, per Newcomb's Wildflower Guide (Newcomb, 1977).

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

Keith Bradley    kab_ambrosia_trifida_2776

August    Swain County    NC

Great Smoky Mountains National Park

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

Roxanna Martin    rlm83010_171

August    Spartanburg County    SC

Staminate heads 3-5mm broad, peduncles 2-7mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm0309f_23

September    Greenville County    SC

Roadside

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm110925_622

September    Greenville County    SC

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm190903_1208

September    Greenville County    SC

Tall Pines Wildlife Management Area

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm210905_3367

September    Greenville County    SC

Swamp Rabbit Trail

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm210905_3372

September    Greenville County    SC

Swamp Rabbit Trail

Stems erect, from 0.3 to 1.5 (to 4) meters tall, per Flora of North America.

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

Richard and Teresa Ware    rtw_ambrosia_trifida_2

September        

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm0310e_06

October    Jackson County    NC

Roadside

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm0310e_09

October    Jackson County    NC

Roadside

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm121024_677

October    Cherokee County    NC

Murphy River Walk

image of Ambrosia trifida var. trifida, Giant Ragweed, Great Ragweed

JK Marlow    jkm121024_684

October    Cherokee County    NC

Murphy River Walk

 

 

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Ambrosia trifida var. trifida   FAMILY Asteraceae__

INCLUDED WITHIN PLANTS NATIONAL DATABASE:
Ambrosia trifida var. trifida   FAMILY Asteraceae__

INCLUDED WITHIN Flora of North America north of Mexico, vol. 19-20-21
Ambrosia trifida

INCLUDED WITHIN VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-02-002:
Ambrosia trifida   FAMILY Asteraceae__

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Ambrosia trifida

 

Find by SCIENTIFIC NAME:

65

Forb
Annual

Habitat: floodplains, moist pastures, disturbed ground, per Weakley's Flora

Native to the Carolinas & Georgia

Common (rare in Coastal Plain)

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
Lower opposite, upper alternate

FLOWER:
Summer/Fall
Disc: Greenish ?
Rays: Absent
Inferior ovary

FRUIT:
Summer/Fall
Black
Achene

 

TO LEARN MORE about this plant, look it up in a good book!



 


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