Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
69. Orchidaceae, the Orchid Family
5. Spiranthes Rich. -- Ladie's-tresses
3. Spiranthes romanzoffiana Cham. -- Hooded ladies'-tresses
Plants 1-3 dm tall, almost entirely glabrous; roots long and fleshy.
Leaves usually green at flowering time, the basal leaves ascending, linear
to narrowly oblong, 8-15 cm long, 2-9 mm wide, blunt, the cauline leaves bractlike.
Spike with 1-3(4) rows of flowers, 3-8 cm long, the bracts ovate-lanceolate,
10-20 mm long, acuminate. Flowers white or cream-colored; perianth
segments only slightly glandular-pubescent on the outside, if at all; sepals
and the lateral petals alike, ovate-lanceolate, all connivent to form a
hood 7-12 mm long, the lateral sepals with only the tips free; lip ovate
when flattened, with obscure thickenings at the base which do not project backward;
sharply curved downward, recurved at the erose tip, about as long as the hood.
Late Jul--Aug. Springs, fens, bogs and seepage areas; rare, from scattered locations
in the region; (Labr. and Newf. to AK, s to PA, MI, IA, NM, AZ and CA; also
n Ireland and w Scotland).
Previous Section -- Spiranthes magnicamporum Sheviak
-- Great Plains ladies'-tresses
Return to Family -- Orchidaceae - The
Next Section -- Spiranthes vernalis Engelm. &
A. Gray -- Spring ladies'-tresses