Spiranthes magnicamporum |
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Great Plains ladies'-tresses, Great Plains lady's tresses |
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Habit | Plants 7–60 cm. |
Roots | few, descending, tuberous, mostly to 0.8 cm diam. |
Leaves | fugaceous or rarely persisting to anthesis, basal, ascending, linear-lanceolate to oblanceolate, to 16 × 1.5 cm. |
Spikes | usually very tightly spiraled, 3–4 flowers per cycle of spiral; rachis moderately pubescent, some trichomes capitate, glands obviously stalked (longest trichomes 0.2–0.52 mm). |
Flowers | abruptly nodding from base, white to ivory, gaping, lip not strongly curving from claw, not urceolate; sepals distinct to base, 5–14 mm; lateral sepals wide-spreading, commonly ascending above flower; petals linear to lance-oblong, 4.9–13 mm, apex acute to obtuse; lip commonly yellow centrally, ovate to oblong, 4.9–12 × 3.3–7 mm, margins crenulate, glabrous; veins several, branches parallel; basal calli short-conic, mostly to 1 mm; viscidia linear-lanceolate; ovary 4–10 mm. |
Seeds | monoembryonic. |
2n | = 30. |
Spiranthes magnicamporum |
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Phenology | Flowering Aug–Nov. |
Habitat | Dry to wet prairies and fens |
Elevation | 0–1900 m (0–6200 ft) |
Distribution |
AL; AR; IA; IL; IN; KS; KY; LA; MI; MN; MO; MS; ND; NE; NM; OH; OK; PA; SD; TX; VA; WI; MB; ON
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Discussion | Leaves typically senesce some weeks before anthesis, usually before the inflorescence appears. Occasionally at the northern and western range limits of the species, however, especially in wetter habitats, they may persist into anthesis. See notes on gene flow and apomixis under 14. Spiranthes cernua. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26, p. 538. |
Parent taxa | Orchidaceae > subfam. Orchidoideae > tribe Cranichideae > subtribe Spiranthinae > Spiranthes |
Sibling taxa | |
Name authority | Sheviak: Bot. Mus. Leafl. 23: 287, plate 22. (1973) |
Web links |