Ageratina altissima var. altissima

Family (Traditional)Asteraceae
Infraspecies:Ageratina altissima (L.) R.M.King & H.Rob. var. altissima
Common NameTall Eupatorium; White Snakeroot
Growth Habitforb
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Duration: Perennial; General Ecology: Terrestrial; Growth Habit: forb; Region of Origin: North America; Reproductive Phenology: July; Reproductive Phenology: August; Reproductive Phenology: September; Reproductive Phenology: October; Leaf Arrangement: opposite; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Fragrance: No; Leaf Persistance: Deciduous; Leaf Petiole Type: petiolate; Leaf Type: broadleaf; Leaf Venation: pinnate; Leaflet Margins: doubly serrate; Leaflet Number: 0; Anther Type: Basifixed; Base Flower Color: White; Carpel Number/Pistil: 1; Fruit Complexity: Simple; Fruit Dehiscence: No; Fruit Type: Cypsela; Fruit Wet/Dry: Dry; Hypanthium Present: No; Inflorescence Position: terminal; Inflorescence Types: corymb/cyme/umbel; Inflorescence Types: head; Ovary Position: Inferior; Overall Flower Symmetry: Actinomorphic; Ovules per Carpel: 1; Perianth Present: Yes; Petal Fusion: Yes; Petal Number: 5; Pistil Complexity: Simple; Pistil Number: 1; Placentation Type: Basal; Sepal Fusion: N/A; Sepal Number: N/A; Sexuality: monoclinous; Sporangium Arrangement: N/A; Stamen Number: 5; Tepal Number: N/A
C value 3
StatusNative; TN[SNR] KY[S5] (State Rank); G5T5 (Global Rank)

** Not applicable or data not available.

Currently no photos are available for this plant.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display the its name. Click the question mark icon () to view additional information about the ecoregions shown. In the map legend, there are links to toggle the visibility of the ecoregions and/or their labels. In addition, clicking on an ecoregion name will highlight that region on the map.

  • State Boundaries
  • Counties
  • Counties - Species Present
  • Southeastern Plains
    • Blackland Prarie
  • Blue Ridge Mountains
  • Ridge and Valley
  • Cumberland Plateau
  • Cumberland Mountains
  • Allegheny Plateau
  • Interior Plateau
    • Bluegrass Region
    • Nashville Basin
    • Pennyroyal Karst Plain
    • Western Highland Rim
    • Eastern Highland Rim


SynonymFull Citation
Ageratina altissima var. angustata Ageratina altissima var. angustata (A. Gray) Clewell & Woot.
Ageratum altissimum Ageratum altissimum L. non Eupatorium altissimum L.
Eupatorium rugosum var. angustata Eupatorium rugosum var. angustata (A. Gray) S.F. Blake
Eupatorium rugosum var. angustatum Eupatorium rugosum var. angustatum
Eupatorium rugosum var. chlorolepis Eupatorium rugosum var. chlorolepis Fernald
Eupatorium rugosum var. rugosum Eupatorium rugosum var. rugosum
Eupatorium rugosum var. tomentellum Eupatorium rugosum var. tomentellum (B.L. Rob.) S.F. Blake
Eupatorium rugosum var. villicaule Eupatorium rugosum var. villicaule (Fernald) S.F. Blake
Eupatorium urticifolium var. tomentellum Eupatorium urticifolium var. tomentellum B.L. Rob.

Specimens and Distribution

No specimens exist for this species.

Plant Photos