Platanthera orbiculata (Round-Leaved Bog Orchid) - photos and description

Platanthera orbiculata

Platanthera orbiculata

Platanthera orbiculata
15 cm ruler for scale

Platanthera orbiculata

Platanthera orbiculata

Platanthera orbiculata

Platanthera orbiculata

Platanthera orbiculata

Platanthera orbiculata
Bracts on stem in above photo

General: Orchid found in moist, shady woods. This plant has an upright growth habit and a single, leafless peduncle. Plants glabrous.

Flowers: Inflorescence is a long spike, spikes measured to 14 cm long. Flowers are greenish white, with a long narrow lip and a long spur. The lateral petals and sepals are spreading. The dorsal sepal forms a hood over the column. Flowers measured at 19 mm diameter, lower lip at 9 mm long, and spurs to 18 mm long.

Leaves: There are two basal leaves, opposite, spreading on the ground. Leaves round to broadly elliptical. Basal leaf measured at 9 cm long and 7.5 cm wide. There are 1 to 3 floral bracts roughly mid way on the peduncle. The floral bracts are lanceolate, we measured a bract at 17 mm long and 5 mm wide.

Height: Height listed in Budd's Flora to 60 cm in height, we measured plants to 33 cm tall.

Habitat: Moist woods in the boreal forest.

Abundance: Rare, ranked as an S2S3 by the Saskatchewan Conservation Data Centre.

Origin: Native.

How to identify this species of orchid: Identified by its two round basal leaves lying flat on the ground, and its long flower spurs.

When and where photographed: The above photos were taken July 5th and July 12th, mossy black spruce woods, boreal forest 450 km north east of our home in Regina, SK.