Contains 15 accepted taxa overall.
Characteristics
Classification
Citation
SPIRANTHES Richard, Orchideis Eur. Annot. 20, 28, 36. 1817; Mem. Mus. Hist. Nat. 4: 42, 50, 58. 1818, nom. cons. vs. Orchiastrum Seguier 1754.
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TYPE: Spiranthes autumnalis Richard, nom. illegit., typ. cons. (Ophrys spiralis Linnaeus; Spiranthes spiralis (Linnaeus) Chevalier)
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Spiranthes ×kapnosperia | ||||
| Spiranthes brevilabris | Short-lipped Ladies’-tresses | |||
| Spiranthes cernua | Nodding Ladies'-tresses | |||
| Spiranthes eatonii | Eaton's Ladies'-tresses | |||
| Spiranthes floridana | Florida Ladies'-tresses | |||
| Spiranthes lacera var. gracilis | Southern Slender Ladies'-tresses | |||
| Spiranthes laciniata | Lace-lip Ladies'-tresses | |||
| Spiranthes longilabris | Giant Spiral Orchid | |||
| Spiranthes ochroleuca | Yellow Nodding Ladies'-tresses | |||
| Spiranthes odorata | Fragrant Ladies'-tresses, Marsh Ladies'-tresses | |||
| Spiranthes ovalis var. erostellata | Oval Ladies'-tresses | |||
| Spiranthes praecox | Grass-leaved Ladies'-tresses, Giant Ladies'-tresses | |||
| Spiranthes sylvatica | Woodland Ladies'-tresses, Pale Green Ladies'-tresses | |||
| Spiranthes tuberosa | Little Ladies'-tresses, Little Pearl-twist | |||
| Spiranthes vernalis | Spring Ladies'-tresses |
Identification Key
1. Trichomes sharply pointed, not capitate; flowering Apr-Jun
1. Trichomes blunt, capitate, not pointed, or plant glabrous
2
2. Inflorescence rachis and flowers moderately to densely pubescent
3
2. Inflorescence rachis and flowers glabrous, or sparsely to semi-moderately pubescent
9
3. Labellum with a patch of papillae
4
3. Labellum not papillate
5
4. Flowers not fragrant; lateral sepals held parallel or below the flower; flowering Feb-Apr
4. Flowers fragrant; lateral sepals usually sweeping upward; flowering Aug-Nov
5. Leaves broadly lanceolate, to 49 cm long; flowers intensely fragrant; flowering Nov-Jan, Apr
5. Leaves linear to oblanceolate, to 13 cm long; flowers not fragrant (or only faintly)
6
6. Labellum centrally yellow; flowering Apr-Jul
6. Labellum centrally white (occasionally faint yellow in S cernua); flowering Aug-Nov
7
7. Lateral sepals flattened
7. Lateral sepals cupped
8
8. Viscidium and rostellum absent; flower autogamous
8. Viscidium and rostellum present; flower chasmogamous
9. Flowers <4 mm long; flowering Jun-Jul
9. Flowers >4 mm long
10
10. Leaves oblanceolate to obovate
11
10. Leaves linear, linear-lanceolate, or absent
12
11. Labellum centrally yellow; flowering Feb-Jun
11. Labellum centrally green; flowering Feb-Apr, Nov
12. Labellum coloration restricted to prominent veins; flowering Mar-May
12. Labellum coloration solid
13
13. Lateral sepals held moderately oblique to widely-spreading, slightly upwardly falcate; flowering Aug-Dec
14
13. Lateral sepals held slightly oblique, moderately downwardly falcate; flowering Apr-Jun
15
14. Lateral sepals slightly oblique; flowering Aug-Sep
14. Lateral sepals moderately oblique to widely-spreading; flowering Oct-Dec
15. Labellum ovate to broadly lanceolate, the apex acute, the margin crenulate-ciliate margin; basal calli long-pubescent
15. Labellum oblong, the apex obtuse, the margin undulate; basal calli glabrous
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| No synonyms found. | |||