Platanthera macrophylla |
Platanthera integrilabia |
|
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greater roundleaf orchid, large round-leaf orchid, large-leaf bog-orchid |
monkeyface, white fringeless orchid |
|
Habit | Plants 23–63 cm. | Plants 50–80 cm. |
Leaves | 2, in subequal basal pair lying on ground; bracts (very rarely, 0–)1–6, scattered along stem; blade broadly elliptic, orbiculate, or oblate, 7–24 × 5–19 cm. |
2(–3), spreading to ascending, on basal portion of stem, abruptly reduced to bracts distally; blade lanceolate to elliptic, 12–23 × 1–3.2 cm. |
Spikes | lax. |
rather lax. |
Flowers | resupinate, rather showy; calyx mostly greenish white; corolla mostly white; lateral sepals reflexed to somewhat spreading; petals lanceolate-falcate, margins entire; lip descending to somewhat reflexed, linear-oblong to linear-lanceolate, without basal thickening, 10–23 × 1–2.5 mm, margins entire; spur slenderly clavate, 28–46 mm; rostellum lobes directed strongly forward, wide-spreading, angular; pollinaria nearly straight, (4.6–)4.7–6.8 mm; pollinia remaining enclosed in anther sacs; viscidia orbiculate; ovary slender to rather stout, mostly 16–29 mm. |
resupinate, showy, white; lateral sepals reflexed; petals oblong, margins entire; lip porrect, spatulate to lance-spatulate, without basal thickening, 10–15 × 2.5–4 mm, margins slightly lacerate to subentire; spur slenderly cylindric, scarcely clavate, 35–60 mm; rostellum lobes directed forward, spreading, angular; rostellum lobes slenderly curving forward, slightly spreading, angular-elongate, long; pollinaria with stalks curved forward; pollinia remaining enclosed in anther sacs; viscidia orbiculate; ovary slender, ca.16–22 mm. |
Platanthera macrophylla |
Platanthera integrilabia |
|
Phenology | Flowering Jun–Aug. | Flowering (Jun–)Jul–Aug. |
Habitat | Mesic to wet coniferous and deciduous forest | Wet wooded flats, seeping slopes, marshes, sphagnum bogs |
Elevation | mostly 0–1000 m (mostly 0–3300 ft) | mostly 100–700 m (mostly 300–2300 ft) |
Distribution |
CT; MA; ME; MI; MN; NH; NY; PA; VT; NB; NL; NS; ON; PE; QC
|
AL; GA; KY; MS; NC; SC; TN
|
Discussion | Of conservation concern. The description of Platanthera integrilabia is based on a limited sample and is likely too restrictive. Flowers of this species are nocturnally sweet-scented. The vegetative habit is distinctive, with leaves restricted to the base of the stem and a relatively few-flowered inflorescence borne atop a tall bracted scape. In addition to the normal tuberoid, roots often enlarge distally to form bud-bearing tuberoids at a marked distance from the parent stem, giving rise to diffuse clonal colonies. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 26. | FNA vol. 26, p. 568. |
Parent taxa | Orchidaceae > subfam. Orchidoideae > tribe Orchideae > subtribe Orchidinae > Platanthera | Orchidaceae > subfam. Orchidoideae > tribe Orchideae > subtribe Orchidinae > Platanthera |
Sibling taxa | ||
Synonyms | Habenaria macrophylla, P. orbiculata var. macrophylla | Habenaria blephariglottis var. integrilabia, Habenaria correlliana |
Name authority | (Goldie) P. M. Brown: Wild Fl. Notes 3: 23. (1988) | (Correll) Luer: Native Orchids U.S. & Canada, 186. (1975) |
Web links |