Listera borealis (Northern Twayblade) - photos and description

 

 

 

 

 

 

 

 

 

 

General: Small orchid with two opposite leaves mid-stem, characteristic of genus Listera. Stems are hairy above the pair of leaves and glabrous below the pair of leaves.

Leaves: The leaves are opposite, ovate to elliptic, leaf highlighted in photo was 4 cm long and 2 cm wide.

Flowers: The flowers are borne in a raceme, are pale-green to yellowish green, and have a two-lobed lower lip, the lower lip with a dark stripe in its middle. The lateral petals and sepals are filiform and reflexed. We counted up to 11 flowers on one plant. Flowers were measured to 15 mm long, the lower lip to 9 mm long.

Height: Height listed in Budd's Flora to 25 cm, we measured plants to 13 cm tall.

Habitat: Mossy, wet, coniferous woods in the boreal forest and Cypress Hills.

Abundance: Extremely rare, ranked as an S1 (as of 2019) by the Saskatchewan Conservation Data Centre.

Origin: Native.

When and where photographed: Photos taken June 16th and June 24th in Duck Mountain Provincial Park, about 300 km north east of Regina, SK, and June 30th, July 5th in the Nisbet Provincial Forest, about 350 km north of our home in Regina, SK.