Ontario Wildflowers website

Glaucous Rattlesnakeroot
Nabalus racemosus
(formerly Prenanthes racemosa)

Glaucous Rattlesnakeroot (Nabalus racemosus) Other common names: Glaucous White Lettuce, Glaucous White Rattlesnakeroot

Other scientific names: Prenanthes racemosa

French names: Prenanthe grappe

Family: Composite Family (Asteraceae)

Group: Prenanthes/Nabalus

Similar species:
  •   Tall Rattlesnakeroot (Nabalus altissimus)

  •   White Lettuce (Nabalus albus)

  •   Three-leaved Rattlesnakeroot (Nabalus trifoliolatus)


Flowers: Summer;  Red/Pink;  7 or more parts (petals)

Native/Non-native: Native

Origin and Meaning of Names:
 Scientific Name: racemosa: with racemes


Photographs: 182 photographs available, of which 12 are featured on this page. SCROLL DOWN FOR PHOTOGRAPHS.

Range Map is at the bottom of the page

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot flower.

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot (Nabalus racemosus)

A Glaucous Rattlesnakeroot plant in bloom.

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot flower buds. Note they are quite hairy.

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot leaves.

Glaucous Rattlesnakeroot (Nabalus racemosus)

The smooth glaucous stem, from which Glaucous Rattlesnakeroot obtains its common name.

Glaucous Rattlesnakeroot (Nabalus racemosus)

An entire Glaucous Rattlesnakeroot plant.

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot (Nabalus racemosus)

Glaucous Rattlesnakeroot seeds ripening and dispersing.


Range map for Glaucous Rattlesnakeroot (Nabalus racemosus)

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)