Northern Green Orchid - Platanthera aquilonis
Platanthera hyperborea [misapplied], Habenaria hyperborea [misapplied]
Stems 15–60 cm. Leaves cauline, 3–15 cm long, lanceolate. Inflorescence dense, 3–20 cm long with 8 to 50+ flowers; bracts 1–4 cm long. Flowers yellowish green; lateral sepals 3–6 mm long; hood 2–5 mm long; lip petal 3–5 mm long, narrowly lanceolate, spreading forward; spur cylindric, curved, 3–6 mm long. Capsule 10–15 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX
Lesica (2012) treats this species as Platanthera hyperborea
(L.) Lindl., but also points out the taxonomic difficulties associated with Montana material.