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Spiranthes
Family: Orchidaceae
Spiranthes image
Max Licher
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  • Gleason & Cronquist
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Gustavo A. Romero-González, Germán Carnevali Fernández-Concha, Robert L. Dressler, Lawrence K. Magrath & George W. Argus in Flora of North America (vol. 26)
Two extra-limital species of Spiranthes have been reported from the flora. The Central American S. graminea Lindley was reported from southern Arizona (C. A. Luer 1975), based on plants subsequently described as S. delitescens Sheviak. The Asiatic S. sinensis Persoon was reported from Florida (J. Beckner 1996) based on plants of S. vernalis with unusual orange markings on the lips.

Vascular plants of NE US and adjacent Canada
Sep and lateral pet similar, the pet connivent with the upper sep (or with all the sep) and projecting forward over the lip and column; lip oblong or ovate to pandurate in outline, bearing 2 small callosities near the basal angles, its margins below the middle upturned and embracing the short column, the more distal part ±decurved, not crested or ridged, but often with a median area of different color; anther borne on the back of the column, its 4 pollinia attached to the viscidium and commonly surpassed by the bidentate or bifid rostellar beak; slender herbs with narrow (seldom broader), chiefly basal lvs, the erect stem bearing several reduced lvs (or mere sheaths) and a terminal, spirally twisted, spike-like raceme; fls mostly white or whitish at least in large part. (Ibidium) 300, cosmop. The fls decrease in size progressively from the bottom to the top of the infl. Measurements given here are for fls in the lower third. In spp. 1-5 the infl is ordinarily such a close spiral that the fls appear to be in 3 or 4 vertical, straight or somewhat spiral ranks. In spp. 6-11 the infl is typically more lax and open, with the fls obviously in a single long spiral, but some of these spp. vary to forms with the infl approaching that of the first group. A number of hybrids have been documented.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Spiranthes borealis
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Spiranthes brevilabris
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Spiranthes casei
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Spiranthes cernua
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Spiranthes delitescens
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Spiranthes diluvialis
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Spiranthes eatonii
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Spiranthes floridana
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Spiranthes folsomii
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Spiranthes infernalis
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Spiranthes intermedia
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Spiranthes itchetuckneensis
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Spiranthes lacera
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Spiranthes laciniata
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Spiranthes longilabris
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Spiranthes lucida
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Spiranthes magnicamporum
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Spiranthes meridionalis
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Spiranthes ochroleuca
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Spiranthes odorata
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Spiranthes ovalis
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Spiranthes parksii
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Spiranthes porrifolia
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Spiranthes praecox
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Spiranthes romanzoffiana
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Spiranthes simpsonii
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Spiranthes sinensis
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Spiranthes torta
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Spiranthes tuberosa
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Spiranthes vernalis
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