Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Ambrosia artemisiifolia
FAMILY
Asteraceae__
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Annual Ragweed at Vascular Plants of North Carolina.
INCLUDING
PLANTS NATIONAL DATABASE:
Ambrosia artemisiifolia +
FAMILY
Asteraceae__
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-02-003:
Ambrosia artemisiifolia FAMILY Asteraceae__
INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Ambrosia elatior
INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Ambrosia glandulosa
INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Ambrosia monophylla
COMMON NAME:
Annual Ragweed, Common Ragweed, Hogweed
To see larger pictures, click or hover over the thumbnails.
)
USDA / Selected Weeds of the US. 1970 swus_page_365
)
JK Marlow jkm0405zb_25
May Greenville County SC
Chandler Heritage Preserve
Leaves deeply bipinnately dissected, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
)
JK Marlow jkm140623_225
June Greenville County SC
Swamp Rabbit Trail
A. artemisiifolia's height:width ratio > 0.8 (vs. that of A. porcheri < 0.8), per Weakley's Flora (2022).
)
JK Marlow jkm210624_1516
June SpartanburgCounty SC
)
JK Marlow jkm210624_1517
June SpartanburgCounty SC
)
JK Marlow jkm150724_514
July Pickens County SC
Annual with taproot and freely branched stems, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm220722_9192
July Greenville County SC
Bald Rock Heritage Preserve
)
JK Marlow jkm0308i_08
August Alamance County NC
)
JK Marlow jkm190831_1080
August Greenville County SC
)
Roxanna Martin rlm82810_82
August Spartanburg County SC
Female flowers borne in clusters from the upper leaf axils, per Wildflowers of Tennessee (Carman, 2005).
)
Gill Newberry gn09_a_artemes_leaf
September
The specific epithet "artemisiifolia" means leaves resembling Artemisia.
COMPARE
leaves of Mugwort, Ragweed and Spanish Needles
)
Roxanna Martin rlm9110_57
September Spartanburg County SC
Male flowers in spikelike clusters that terminate stem and upper branches, per Wildflowers of Tennessee (Carman, 2005).
)
Roxanna Martin rlm91811_54
September Spartanburg County SC
Female heads roundish, clustered in upper leaf axils below male spike, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
)
Roxanna Martin rlm91811_56
September Spartanburg County SC
)
Roxanna Martin rlm9310_80
September Spartanburg County SC
Male heads saucer-shaped, about 0.1" wide, disk flowers 5-lobed, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
)
JK Marlow jkm151006_329
October Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm151006_329b
October Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm151006_331
October Greenville County SC
Swamp Rabbit Trail
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Ambrosia artemisiifolia
FAMILY
Asteraceae__
INCLUDING
PLANTS NATIONAL DATABASE:
Ambrosia artemisiifolia +
FAMILY
Asteraceae__
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-02-003:
Ambrosia artemisiifolia
FAMILY
Asteraceae__
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Ambrosia elatior
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Ambrosia glandulosa
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Ambrosia monophylla
64
Forb
Annual
Habitat: Roadsides, gardens, disturbed soils, thin soils on rock outcrops, per Weakley's Flora
Native to the Carolinas & Georgia
Common
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
LEAVES:
Simple: Dissected
Lower opposite, upper alternate
FLOWER:
Summer/Fall
Disc: Greenish
Rays: Absent
Inferior ovary
FRUIT:
Summer/Fall
Brown
Achene
TO LEARN MORE about this plant, look it up in a good book!
- Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005) p010
- Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001) p403
- Guide to the Wildflowers of SC, 2nd ed. (McMillan, Porcher, Rayner, & White; 2022) p095
- Guide to the Wildflowers of SC, 2nd ed. (McMillan, Porcher, Rayner, & White; 2022) p551
- Newcomb's Wildflower Guide (Newcomb, 1977) p438
- Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019) p460
- Wildflowers of the Eastern United States (Duncan & Duncan, 1999) p120
- Wild Flowers of NC, 2nd edition (Justice, Bell, & Lindsey, 2005) p245
- Field Guide to the Wildflowers of Georgia (Chafin, 2016) p057
- Wildflowers of Tennessee (Carman, 2005) p273
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005) p321
- Wildflowers & Plant Communities of the Southern Appalachian Mountains and Piedmont (Spira, 2011) p330
- Weeds of Southern Turfgrasses (Murphy et al., 1992) p081
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