Plant Index

 
 
 
 

Ageratina altissima var. roanensis

Ageratina altissima (L.) King & H. Rob. var. roanensis (Small) Clewell & Woot.

appalachian milk-poison, appalachian white snakeroot

Synonym(s): Eupatorium roanense, Eupatorium rugosum var. roanense, Eupatorium urticifolium
Ageratina altissima var. roanensis (Appalachian Milk-poison)
Image ID: 20710
Image by: Cressler, Alan M.
Image Collection: NCBG Digital Library

PLANT INDEX

ID_PLANT: AGALR
SCIENTIFIC NAME: Ageratina altissima var. roanensis
Include in WOTAS: 0
Publish to Web: 1
Last Modified: 2016-10-21

GENUS INDEX

GENUS CODE: AGERA2
GENUS SCIENTIFIC: Ageratina
GENUS AUTHORITY: Spach
GENUS COMMON: Snakeroot
GENUS SUMMARY: A genus of about 250-290 species, American. The separation of Ageratina from Eupatorium is clearly warranted, on morphological, karyological, and molecular grounds.
GENUS IDENTIFICATION:
GENUS REFERENCES: Nesom in FNA (2006c); Clewell & Wooten (1971)=Z; Cronquist (1980)=SE. Key based in part on Z and SE.

FAMILY INDEX

FAMILY CODE: ASTERA
FAMILY SCIENTIFIC: Asteraceae
FAMILY AUTHORITY: Dumortier 1822 or COMPOSITAE Giseke 1792
FAMILY COMMON: Aster Family
FAMILY SUMMARY: A family of about 1500-1700 genera and 20,000-25,000 species, shrubs, herbs, trees, and vines, cosmopolitan in distribution.
FAMILY REFERENCE: Cronquist (1980)=SE throughout family treatment.

NCBG DESCRIPTIVES

INTRO:
STEMS:
LEAVES:
INFLORESCENCE:
FLOWERS:
FRUITS:
COMMENTS:
HEIGHT: 2-4 ft.
DURATION: Perennial
HABIT: Herb
LEAF ARRANGEMENT:
LEAF COMPLEXITY:
LEAF RETENTION:
FLORAL CHARACTERISTICS
SYMMETRY:
BLOOM TIME: Aug-Oct
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
x x x x x

BLOOM COLOR: White flowers
White Red Pink Orange Yellow Green Blue Lavender Purple Violet Brown Not Applicable
x

FRUITING PERIOD:
DISTRIBUTION
HABITAT TYPE: Moist forests
NATIVE RANGE: southeastern United States
HORTICULTURAL
Plant Sale Text: White snakeroot has tight clusters of showy, white flowers that resemble those of boneset (Eupatorium perfoliatum). It is a good nectar source for a variety of bees and butterflies. White snakeroot contains a toxin called tremetol which can pass through the milk of cows that have eaten it, causing something known as “milk sickness” in humans, which was common in the early 19th century.

Bloom Table Text:

NCBG Location:

Cultural Notes:

SOIL MOISTURE: Dry, Average, Moist/Wet, Well-drained
LIGHT EXPOSURE: Sun, Part Shade, Shade
MINIMUM HARDINESS ZONE: 4
MAXIMUM HARDINESS ZONE: 8
GERMINATION CODE:
WILDLIFE VALUE: Bee Friendly, Butterfly Friendly
DEER RESISTANCE:

GRIM COLLECTIONS

Coll_id Project Collection date Collector Action
1136 HORT 2006-09-26 Randall View

GRIM ACCESSIONS

acc_id acc_num acc_dt coll_id Action
9215 2006-0620 2020-05-07 1136 View

GRIM PLANTINGS

plt_num acc_id loc_num pers_num inst_dt Action
12301 9215 66 Liloia 2007-11-19 View
12302 9215 71 Liloia 2007-11-19 View

USDA PLANTS DATABASE

USDA Symbol: AGALR
USDA Common Name: White Snakeroot
Native Status: L48 (N)
Distribution: USA (AL, GA, KY, NC, SC, TN, VA, WV)
Duration: Perennial
Growth Habit: Forb/herb

WEAKLEY FLORA

SCIENTIFIC NAME: Ageratina altissima var. roanensis
COMMON NAME: Appalachian White Snakeroot, Appalachian Milk-poison
SYNONYMY: [= FNA, K, Va, Z; < Eupatorium rugosum Houttuyn - G, RAB, W; = Eupatorium rugosum var. roanense (Small) Fernald - C, F, SE; = Eupatorium roanensis Small - S]
PHENOLOGY: Aug-Oct.
HABITAT: Moist forests, often abundant at high elevations.
COMMENTS: Endemic to moderate to high elevations of the Southern Appalachians, from nw. VA south to w. SC, n. GA, e. TN, e. KY, and possibly ne. AL.
RANGE MAP: Ageratina altissima var. roanensis.png

Key to Map Symbols
ABOUT FAMILY (Weakley Flora)
Asteraceae Dumortier 1822 or COMPOSITAE Giseke 1792 (Aster Family)
SUMMARY: A family of about 1500-1700 genera and 20,000-25,000 species, shrubs, herbs, trees, and vines, cosmopolitan in distribution.
REFERENCE: Cronquist (1980)=SE throughout family treatment.
ABOUT GENUS (Weakley Flora)
Ageratina Spach (Snakeroot)
SUMMARY: A genus of about 250-290 species, American. The separation of Ageratina from Eupatorium is clearly warranted, on morphological, karyological, and molecular grounds.
REFERENCE: Nesom in FNA (2006c); Clewell & Wooten (1971)=Z; Cronquist (1980)=SE. Key based in part on Z and SE.

HERBARIUM RESOURCES

SERNEC: Find Ageratina altissima var. roanensis in Southeast Regional Network of Experts and Collections (if available)
UNC SERNEC: Find Ageratina altissima var. roanensis in University of North Carolina Chapel Hill Herbarium - Southeast Regional Network of Experts and Collections (if available)

WEB RESOURCES

USDA: Find Ageratina altissima var. roanensis in USDA Plants
NPIN: Find Ageratina altissima var. roanensis in NPIN Database
FNA: Find Ageratina altissima var. roanensis in the Flora of North America (if available)
Google: Search Google for Ageratina altissima var. roanensis

IMAGE USE RECORDS

ID IMAGE: 20710 - Primary Image FloraQuest Plant Detail Page (Landscape Preferred)
ID IMAGE1: 20710 - Primary Image WOTAS
ID IMAGE2: 0 - Secondary Image WOTAS
ID IMAGE3: 25660 - Primary Image Plant Sale Sign (Landscape Only)
ID IMAGE4: 0 - Primary Image New Plant Sale Label (Portrait Only)

From the Image Gallery


Image ID: 20711

Image ID: 25660

Image ID: 25661
4 photo(s) available in the Image Gallery

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