Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
69. Orchidaceae, the Orchid Family
4. Platanthera Rich.
2. Platanthera praeclara Sheviak & Bowles -- Western prairie fringed
Plants 3-8 dm tall, glabrous. Leaves lanceolate to broadly linear, 8-20
cm long (including the strongly sheathing base), 1-4 cm wide, blunt-tipped.
Spike cylindric, 5-15 cm long; bracts lanceolate, blunt, 1-4 cm
long; flowers several to many, spreading, white, large and showy; sepals
9-12 mm long, broadly ovate to obovate; lateral petals broadly obovate-cuneate,
erose, 10-15 mm long; lip deeply 3-lobed with fringed margins, 1.5-2.5
cm long and about as wide, the lobes flabelliform, deeply dissected, the spur
conspicuous, 2-5 cm long, usually curved; ovary elongate, 2-3 cm long.
Late Jun--Jul. Wet meadows and low prairie, often where sandy; occasional in
se ND, otherwise rare or extinct in e SD, e and c NE; (N.S. and Ont. to ND,
s to OH, LA and KS). Habenaria leucophaea (Nutt.) A. Gray, Platanthera
leucophaea (Nutt.) Lindl.
Previous Section -- Platanthera hyperborea (L.)
Lindl. -- Northern green orchid
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