Aquatic and Wetland Vascular Plants of the Northern Great Plains
69. Orchidaceae, the Orchid Family
4. Platanthera Rich.1. Platanthera hyperborea (L.) Lindl. -- Northern green orchid
Plants 1.5-7 dm tall, glabrous. Leaves lanceolate to oblanceolate, 5-20 cm long, 1-3.5(5) cm wide, acute to rounded or mucronate, reduced in size upward. Spike elongate, usually dense, 4-20 cm long; bracts lanceolate, acute to blunt, 6-20 mm long, reduced upward; flowers usually numerous, erect, greenish, small, not showy; sepals green, 2-4 mm long, the upper sepal broadly ovate and hoodlike, the lateral sepals lanceolate to ovate and spreading; petals green to greenish-white, the lateral petals lanceolate, curved upward, 1.5-2.5 mm long; lip ovate-lanceolate, 4-7 mm long, entire; spur inconspicuous, curved forward under the lip, about equaling the lip; ovary cylindric, 6-12 mm long. Mid Jun--Aug. Springs, bogs, fens, stream margins, seepage areas and fresh wet meadows; occasional from ND and e MT to n NE and e WY, especially common in the Black Hills; (Labr. and Newf. to AK, s to RI, PA, IN, IA, NE, NM and OR; also Iceland, Greenl. and e Asia). Habenaria hyperborea (L.) R.Br.
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