OF THE CAROLINAS & GEORGIA

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



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.

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

USDA / Selected Weeds of the US. 1970    swus_page_407

        

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

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).

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

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).

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

JK Marlow    jkm180821_4016

August    Jackson County    NC

Whiteside Mountain

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

JK Marlow    jkm180821_4018

August    Jackson County    NC

Whiteside Mountain

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

Keith Bradley    kab_a_altissima_2881

August    Macon County    NC

Nantahala National Forest

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

Tim Spira    tps_aaltissima_2

August        

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

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).

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

JK Marlow    jkm200926_7396

September    Transylvania County    NC

DuPont State Forest

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

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).

image of Ageratina altissima, Common White Snakeroot, Common Milk-poison

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

 

Find by SCIENTIFIC NAME:

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)

map
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
Inferior ovary
Bisexual

FRUIT:
Summer/Fall
Lustrous black
Achene

 

TO LEARN MORE about this plant, look it up in a good book!



 


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