Ontario Wildflowers website

Tall Rattlesnake Root
Nabalus trifoliolatus
(formerly Prenanthes trifoliata)

Tall Rattlesnake Root (Nabalus trifoliolatus) Other common names: Gall-of-the-Earth

Other scientific names: Prenanthes trifoliata

Family: Composite Family (Asteraceae)

Group: Prenanthes/Nabalus, Lettuces

Similar species:
  •   White Lettuce (Nabalus albus)

  •   Tall Rattlesnakeroot (Nabalus altissimus)

  •   Glaucous Rattlesnakeroot (Nabalus racemosus)


Flowers: Summer;  White;  7 or more parts (petals);  Cream, pale yellow or whitish, and have many (greater than 7) florets per head but each individual flower has petals fused into one petal.

Books: Newcomb's Wildflower Guide: 384   

Origin and Meaning of Names:
 Scientific Name: trifoliata: three-leaved


Photographs: 81 photographs available, of which 1 are featured on this page. SCROLL DOWN FOR PHOTOGRAPHS.

Range Map is at the bottom of the page

Tall Rattlesnake Root (Nabalus trifoliolatus)

A Tall Rattlesnake Root plant in bloom, with flower buds as well.


Range map for Tall Rattlesnake Root (Nabalus trifoliolatus)

PLEASE NOTE: A coloured Province or State means this species occurs somewhere in that Province/State.
The entire Province/State is coloured, regardless of where in that Province/State it occurs.

(Range map provided courtesy of the USDA website and is displayed here in accordance with their Policies)