Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Ambrosia at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA (11/30/12):
Ambrosia trifida var. trifida
FAMILY
Asteraceae__
INCLUDED WITHIN
PLANTS NATIONAL DATABASE:
Ambrosia trifida var. trifida
FAMILY
Asteraceae__
INCLUDED WITHIN
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-02-002:
Ambrosia trifida
FAMILY
Asteraceae__
COMMON NAME:
Giant Ragweed, Great Ragweed
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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
JK Marlow jkm130823_485
August Greenville County SC
Swamp Rabbit Trail
Leaves usually with 3-5 deep lobes, per Newcomb's Wildflower Guide.
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...