Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Spiranthes romanzoffiana Cham.
- Family: Orchid (Orchidaceae)
- Flowering: July-September
- Field Marks: The flowers in this ladies'-tresses are in 2-4 twisted rows and the petals are turned upward or outward. The 3 sepals and 2 petals are grouped together to form a pronounced hood.
- Habitat: Along streams, in bogs, mountain meadows.
- Habit: Perennial herb with a cluster of thickened, fleshy roots.
- Stems: Upright, unbranched, up to 1 foot tall, smooth or glandular-hairy.
- Leaves: Alternate, simple, linear-lanceolate to oblanceolate, up to 4 inches long, up to 1/2 inch wide, without teeth, smooth or glandular-hairy.
- Flowers: Many crowded into a twisted, terminal spike, the spike up to 4 inches long; bract lanceolate, longer than the flowers.
- Sepals: 3, white, cream, or greenish white, grouped with 2 of the 3 petals to form a hood 1/3-1/2 inch long; lateral sepals turned downward at the tip.
- Petals: 3, white, cream, or greenish white, 2 of them grouped with the 3 sepals to form a hood, the other forming an oblong lip that turns down abruptly.
- Stamens: 3.
- Pistils: Ovary inferior, smooth.
- Fruits: Capsules ellipsoid, smooth, up to 1/4 inch long.
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