Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Eupatorium torreyanum
FAMILY
Asteraceae__
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Torrey's Thoroughwort at Vascular Plants of North Carolina.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Eupatorium hyssopifolium var. laciniatum
FAMILY
Asteraceae__
SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Eupatorium torreyanum
SYNONYMOUS WITH Flora of North America north of Mexico, vol. 21 (2006)
Eupatorium hyssopifolium var. laciniatum
SYNONYMOUS WITH Floristic Synthesis of North America (Kartesz, 1999)
Eupatorium hyssopifolium var. laciniatum
INCLUDED WITHIN VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-34-013?:
Eupatorium hyssopifolium FAMILY Asteraceae__
SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Eupatorium torreyanum
COMMON NAME:
Torrey's Thoroughwort, Torrey's Eupatorium
To see larger pictures, click or hover over the thumbnails.
)
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_euto6_001_lvd
)
Alan S. Weakley asw_627155369016727
May Granville County NC
)
JK Marlow jkm250715_1622
July Greenville County SC
Leaves lanceolate, the principal leaves 5-12cm long, 5-10(12) mm wide, 6-15× as long as wide,...
)
JK Marlow jkm250715_1626
July Greenville County SC
...conspicuously & divergently toothed, leaves mostly opposite or in whorls of 3 [note "mostly"], per Weakley's Flora (2025).
)
JK Marlow jkm140801_269
August Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm140801_272
August Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm170826_798
August Spartanburg County SC
)
JK Marlow jkm140909_581
September Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm230901_5168
September Greenville County SC
)
JK Marlow jkm230901_5169
September Greenville County SC
Flowers discoid, perfect, white, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm201008_7658
October Greenville County SC
Leaves lance-shaped, rough, with 3 prominent veins and widely spaced teeth, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
)
JK Marlow jkm201008_7659
October Greenville County SC
)
Richard and Teresa Ware rtw_eupatorium_torreyanum
October
Leaves usually spreading or ascending (not deflexed), per Weakley's Flora.
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Eupatorium torreyanum
FAMILY
Asteraceae__
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Eupatorium hyssopifolium var. laciniatum
FAMILY
Asteraceae__
SYNONYMOUS WITH
Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Eupatorium torreyanum
SYNONYMOUS WITH
Flora of North America north of Mexico, vol. 21
Eupatorium hyssopifolium var. laciniatum
SYNONYMOUS WITH
Floristic Synthesis of North America (Kartesz, 1999)
Eupatorium hyssopifolium var. laciniatum
INCLUDED WITHIN
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-34-013?:
Eupatorium hyssopifolium
FAMILY
Asteraceae__
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933, 1938)
Eupatorium torreyanum
3635
Forb
Habitat: Dry woodlands, powerline rights-of-way, roadsides, marshes, per Weakley's Flora
Native to the Carolinas & Georgia
Common in Carolina Piedmont, rare in Mountains (uncommon elsewhere in GA-NC-SC)
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
LEAVES:
Simple
Mostly opposite or in whorls of 3
Leaves sessile
FLOWER:
Summer/Fall
Disc: White
Rays: Absent
Inferior ovary
Bisexual
FRUIT:
Summer/Fall
Lustrous black
Achene
TO LEARN MORE about this plant, look it up in a good book!
If a search such as "Carex leptalea var. leptalea" doesn't deliver the results you want, try "Carex leptalea".
Or, to minimize chances of a misspelling, try just "Carex le".
Less is more: If "pencil flower" doesn't deliver the results you want, try "pencil".