Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA (4/24/22):
Ambrosia trifida var. trifida
FAMILY
Asteraceae__
NEW! Click to go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Ambrosia at Vascular Plants of North Carolina.
INCLUDED WITHIN
PLANTS NATIONAL DATABASE:
Ambrosia trifida var. trifida
FAMILY
Asteraceae__
INCLUDED WITHIN
Flora of North America
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.
)
JK Marlow jkm140623_235
June Greenville County SC
Swamp Rabbit Trail
)
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.
COMPARE
leaves of Giant Ragweed and Sassafras
)
Gill Newberry gn08_a_trifida_plant
August
)
JK Marlow jkm130823_485
August Greenville County SC
Swamp Rabbit Trail
Leaves usually with 3-5 deep lobes, per Newcomb's Wildflower Guide.
)
Keith Bradley kab_ambrosia_trifida_2776
August Swain County NC
Great Smoky Mountains National Park
)
Roxanna Martin rlm83010_171
August Spartanburg County SC
Staminate heads 3-5mm broad, peduncles 2-7mm long, per Vascular Flora of the Carolinas.
)
JK Marlow jkm0309e_13a
September Greenville County SC
Roadside
Just looking at the picture makes you want to sneeze...
)
JK Marlow jkm0309f_23
September Greenville County SC
Roadside
)
JK Marlow jkm110925_622
September Greenville County SC
)
JK Marlow jkm190903_1208
September Greenville County SC
)
Richard and Teresa Ware rtw_ambrosia_trifida_2
September
)
JK Marlow jkm0310e_06
October Jackson County NC
Roadside
)
JK Marlow jkm0310e_09
October Jackson County NC
Roadside
)
JK Marlow jkm121024_677
October Cherokee County NC
Murphy River Walk
)
JK Marlow jkm121024_684
October Cherokee County NC
Murphy River Walk
WEAKLEY'S FLORA (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
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
65
Forb
Annual
Native to the Carolinas & Georgia
Common (rare in Coastal Plain)
Habitat: floodplains, moist pastures, disturbed ground, per Weakley's Flora
NEW! Click here to see a map from Weakley's Flora of the Southeastern US showing range and abundance.
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!
- Forest Plants of the Southeast and Their Wildlife Uses p010
- Guide to the Wildflowers of SC p403
- Newcomb's Wildflower Guide p438
- Wildflowers of the Atlantic Southeast p461
- Wildflowers of the Eastern United States p120
- Wildflowers of Tennessee p273
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians p321