Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Ageratina altissima
FAMILY
Asteraceae__
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about White Snakeroot at Vascular Plants of North Carolina.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Ageratina altissima var. altissima
FAMILY
Asteraceae__
SYNONYMOUS WITH Flora of North America
Ageratina altissima var. altissima
INCLUDED WITHIN Guide to the Vascular Plants of Florida (Wunderlin & Hansen, 2011)
Ageratina altissima
SYNONYMOUS WITH Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Eupatorium rugosum var. rugosum
INCLUDED WITHIN VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-34-021:
Eupatorium rugosum FAMILY Asteraceae__
SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Eupatorium urticifolium
COMMON NAME:
Common White Snakeroot, Common Milk-poison
To see larger pictures, click or hover over the thumbnails.
)
JK Marlow jkm210516_0374
May Greenville County SC
Tall Pines Wildlife Management Area
Leaves coarsely serrate, deltoid to ovate (the base generally broadly cuneate, per Weakley's Flora (2022).
)
JK Marlow jkm180821_4015
August Jackson County NC
Whiteside Mountain
)
JK Marlow jkm180821_4016
August Jackson County NC
Whiteside Mountain
)
JK Marlow jkm180821_4018
August Jackson County NC
Whiteside Mountain
)
Keith Bradley kab_a_altissima_2881
August Macon County NC
Nantahala National Forest
)
Tim Spira tps_aaltissima_2
August
)
JK Marlow jkm080924_072
September Transylvania County NC
Blue Ridge Parkway
Disk flowers bright white, 12-24 per involucrate head, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
)
JK Marlow jkm200926_7396
September Transylvania County NC
DuPont State Forest
)
Sam Pratt sbp_092513_1986
September Spartanburg County SC
In cultivation
Inflorescence a flat or rounded corymb-like structure, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
)
JK Marlow jkm121027_848
October Pickens County SC
Glassy Mountain Heritage Preserve
Leaves ovate with rounded bases and sharply toothed margins, well stalked, per Wildflowers of the Southern Mountains (Smith, 1998).
COMPARE
leaves of Snakeroot species
)
Keith Bradley kab_a_altissima_2767
October Polk County NC
Petioles 1.5-6 cm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Ageratina altissima
FAMILY
Asteraceae__
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Ageratina altissima var. altissima
FAMILY
Asteraceae__
SYNONYMOUS WITH
Flora of North America
Ageratina altissima var. altissima
INCLUDED WITHIN
Guide to the Vascular Plants of Florida (Wunderlin & Hansen, 2011)
Ageratina altissima
SYNONYMOUS WITH
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Eupatorium rugosum var. rugosum
INCLUDED WITHIN
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-34-021:
Eupatorium rugosum
FAMILY
Asteraceae__
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933, 1938)
Eupatorium urticifolium
556
Forb
Perennial
Habitat: Moist forests, such as cove forests, per Weakley's Flora
Native to the Carolinas & Georgia
Common (uncommon to rare in Coastal Plain)
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
Opposite
Petioles 1.5-6cm long
FLOWER:
Summer/Fall
Disc: White
Rays: Absent
Bisexual
Inferior ovary
FRUIT:
Summer/Fall
Lustrous black
Achene
TO LEARN MORE about this plant, look it up in a good book!
- All About South Carolina Wildflowers (Midgley, 1999) p093
- Gardening with the Native Plants of Tennessee (Hunter, 2002) p099
- Great Smoky Mountains Wildflowers (Campbell, Hutson, Sharp, & Hutson, 1962) p120?
- Guide to the Wildflowers of SC (Porcher & Rayner, 2001) p137
- Newcomb's Wildflower Guide (Newcomb, 1977) p436
- Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019) p189
- Wildflowers of the Eastern United States (Duncan & Duncan, 1999) p107
- Wild Flowers of NC, 2nd edition (Justice, Bell, & Lindsey, 2005) p259?
- Field Guide to the Wildflowers of Georgia (Chafin, 2016) p056
- Wildflowers of Tennessee (Carman, 2005) p272
- 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) p328
- Wildflowers of the Southern Mountains (Smith, 1998) p180