Comments
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The nomenclatural history of Spiranthes tuberosa is rather complex, and among the names applied to it are Spiranthes beckii Lindley and Ibidium beckii (Lindley) House. See D. S. Correll (1950) for a discussion.
This species is easily recognized by its pure white flowers, broad crisped lip, and fugacious leaves.
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Description
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Plants 5–30 cm. Roots solitary, vertical, tuberous, turbinate, mostly to 1 cm diam. Leaves fugacious, 3–5, basal, spreading, oval-oblanceolate, 2–6 × 1–2 cm. Spikes loosely spiraled, 4–7 flowers per cycle of spiral; rachis glabrous. Flowers pure white, gaping from near middle, tubular portion less than 3 mm; sepals distinct to base, 5 × 1 mm; lateral sepals slightly spreading; petals linear to lance-oblong, 5 × 1 mm, apex acute to obtuse; lip 5 × 2.5 mm, ovate to oblong, apex dilated with broad crisped, finely lacerate margin; veins several, branches very short; basal calli long-pointed, mostly to 1 mm; viscidium linear-lanceolate; ovary mostly 3 mm. Seeds monoembryonic.
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Distribution
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Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mass., Mich., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Va., W.Va.
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Habitat
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Dry to open woods, outcrops, old fields, roadsides, cemeteries; 0--400m.
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Synonym
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Spiranthes grayi Ames; S. simplex A. Gray; S. tuberosa var. grayi (Ames) Fernald
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Spiranthes tuberosa: Brief Summary
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Spiranthes tuberosa, commonly called little lady's tresses, little pearl-twist and slender ladies'-tresses is an orchid species. It is a perennial plant native to North America.
The basal leaves are short-lived, blooming plants having pure white flowers spirally arranged around the single-stemmed inflorescence; the plants grow in grasslands and open woods.
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Spiranthes tuberosa: Brief Summary
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Spiranthes tuberosa là một loài thực vật có hoa trong họ Lan. Loài này được Raf. miêu tả khoa học đầu tiên năm 1833.
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