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__
INCLUDED WITHIN Guide to the Vascular Plants of Florida (Wunderlin & Hansen, 2011)
Ageratina altissima
SYNONYMOUS WITH Flora of North America north of Mexico, vol. 19-20-21 (2006)
Ageratina altissima var. 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.
)
USDA / Selected Weeds of the US. 1970 swus_page_407
)
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
Leaves ovate with rounded bases and sharply toothed margins, well stalked, per Wildflowers of the Southern Mountains (Smith, 1998).
)
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).
)
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__
INCLUDED WITHIN
Guide to the Vascular Plants of Florida (Wunderlin & Hansen, 2011)
Ageratina altissima
SYNONYMOUS WITH
Flora of North America north of Mexico, vol. 19-20-21
Ageratina altissima var. 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.
LEAVES:
Simple
Opposite
Petioles 1.5-6cm long
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!
- 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, 1st ed. (Porcher & Rayner, 2001) p137
- Guide to the Wildflowers of SC, 2nd ed. (McMillan, Porcher, Rayner, & White; 2022) p148
- 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
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