Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Erigeron canadensis
FAMILY
Asteraceae
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
The exotic Hairy Fleabane (E. bonariensis) is quite similar but is copiously hairy. Read more at Vascular Plants of North Carolina.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Conyza canadensis var. canadensis
FAMILY
Asteraceae
INCLUDED WITHIN Flora of North America
Conyza canadensis
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-44-008a:
Erigeron canadensis var. canadensis FAMILY Asteraceae
SYNONYMOUS WITH Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Conyza canadensis var. canadensis
SYNONYMOUS WITH Gray's Manual of Botany (Fernald, 1950)
Erigeron canadensis
SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Leptilon canadense
COMMON NAME:
Common Horseweed
To see larger pictures, click or hover over the thumbnails.
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USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_leca16_001_lvd
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JK Marlow jkm120727_828
July Spartanburg County SC
Leaves alternately spiraling, numerous and crowded along stem, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
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JK Marlow jkm120727_831
July Spartanburg County SC
Pappus bristles white to tan, capillary, 2-2.3mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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JK Marlow jkm120727_835
July Spartanburg County SC
Stem coarsely spreading-hirsute (vs E. pusillus stem glabrous or widely scattered appressed hairs), per Weakley's Flora.
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JK Marlow jkm120727_837
July Spartanburg County SC
The inflorescence is a large open panicle bearing a great many small heads, per Wildflowers of the Southern Mountains (Smith, 1998).
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JK Marlow jkm120727_839
July Spartanburg County SC
Stem leaves sessile, long-ciliate particularly toward base, base attenuate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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JK Marlow jkm120727_854
July Spartanburg County SC
Phyllaries green-tipped or white-tipped (vs. those of E. pusillus purple-tipped), per Weakley's Flora (2022).
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JK Marlow jkm120727_858
July Spartanburg County SC
The involucre is 1/8" high, and the whitish rays are narrow, short and erect, per Wildflowers of the Southern Mountains (Smith, 1998).
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JK Marlow jkm220722_9269
July Greenville County SC
Tall Pines Wildlife Management Area
E. pusillus on the left, E. canadensis on the right.
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Gill Newberry gn08_c_canadensis_inf
August
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Gill Newberry gn08_c_canadensis_plant
August
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Gill Newberry gn08_e_conyza_canadensis
August
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Gill Newberry gn08_e_conyza_inf
August
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JK Marlow jkm130824_548
August Spartanburg County SC
Stem spreading pubescent, rarely glabrous (whereas var. pusillus is glabrous), per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Gill Newberry gn09_e_conyza_habitat
September
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Erigeron canadensis
FAMILY
Asteraceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Conyza canadensis var. canadensis
FAMILY
Asteraceae
INCLUDED WITHIN
Flora of North America
Conyza canadensis
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-44-008a:
Erigeron canadensis var. canadensis
FAMILY
Asteraceae
SYNONYMOUS WITH
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Conyza canadensis var. canadensis
SYNONYMOUS WITH
Gray's Manual of Botany (Fernald, 1950)
Erigeron canadensis
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933, 1938)
Leptilon canadense
526
Forb
Annual
Habitat: Old fields, disturbed areas, roadsides, gardens, 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.
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
Alternate (basal leaves usually absent or withered at flowering)
FLOWER:
Summer/Fall
Rays: White/Lavender (few, 1-2mm long)
Disc: Yellow/Yellowish
Disc flowers bisexual & fertile/ Ray flowers pistillate & fertile
Inferior ovary
FRUIT:
Summer/Fall
Yellowish
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) p042?
- Newcomb's Wildflower Guide (Newcomb, 1977) p384?
- Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019) p184
- Field Guide to the Wildflowers of Georgia (Chafin, 2016) p069
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005) p335?
- Wildflowers of the Southern Mountains (Smith, 1998) p215?