Ontario Wildflowers website

Tall White Lettuce
(Prenanthes altissima)

Tall White Lettuce (Prenanthes altissima) Other common names: Tall White Rattlesnake-root

Other scientific names: Nabulus altissimus

French names: Prenanthe élevée

Family: Composite Family (Asteraceae)

Group: Lettuces, Prenanthes

Similar species:
  •   White Lettuce (Prenanthes alba)

  •   Tall Rattlesnake Root (Prenanthes trifoliata)

  •   Glaucous White Rattlesnake Root (Prenanthes racemosa)


Flowers: Summer;  White, Green/Brown;  5 parts (petals)

Leaves: Alternate, Simple, Toothed

Habitat: Forests

Grows in Sun/Shade: Shade

Books: Newcomb's Wildflower Guide: 212   

Native/Non-native: Native

Origin and Meaning of Names:
 Scientific Name: : tall


Photographs: 109 photographs available, of which 10 are featured on this page. SCROLL DOWN FOR PHOTOGRAPHS.

Range Map is at the bottom of the page
  

Tall White Lettuce (Prenanthes altissima)

Tall White Lettuce flower and flower buds.

Tall White Lettuce (Prenanthes altissima)

Tall White Lettuce flowers are greenish-white.

Tall White Lettuce (Prenanthes altissima)

Ripe Tall White Lettuce seeds dispersing.

Tall White Lettuce (Prenanthes altissima)

Tall White Lettuce (Prenanthes altissima)

The laves of Tall White Lettuce are highly variable, as with most Prenanthes.

Tall White Lettuce (Prenanthes altissima)

More Tall White Lettuce leaves.

Tall White Lettuce (Prenanthes altissima)

A less typical shape is shown here.

Tall White Lettuce (Prenanthes altissima)

And sometimes a triangle.

Tall White Lettuce (Prenanthes altissima)

It is best to not try to identify Prenanthes by their leaves!

Tall White Lettuce (Prenanthes altissima)

An entire Tall White Lettuce plant.
  


Range map for Tall White Lettuce (Prenanthes altissima)

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)

 

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