Platanthera macrophylla |
Platanthera leucophaea |
|
---|---|---|
greater roundleaf orchid, large round-leaf orchid, large-leaf bog-orchid |
eastern prairie fringe orchid, eastern prairie white fringe bog-orchid, prairie white fringe orchid |
|
Habit | Plants 23–63 cm. | Plants 32–112 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. |
several to many, ascending, scattered along stem, imperceptibly reduced to bracts distally; blade lanceolate to ovate-lanceolate, usually to 20 × 4 cm. |
Spikes | lax. |
lax to moderately dense. |
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, corolla white, calyx green to whitish green; lateral sepals porrect; petals obovate to rarely flabellate, apically lacerate; lip descending to horizontally projecting, deeply 3-lobed, without basal thickening, 14–22 × 15–29 mm, distal margins of lobes deeply incised, fringed, lateral lobes flabellate, usually broad, overlapping middle lobe, middle lobe flabellate, sometimes very broadly, emarginate; spur slenderly clavate, 28–47 mm; rostellum lobes nearly parallel, directed downward, short, rounded; pollinaria geniculate; pollinia directed forward (column appearing hooded), remaining enclosed in anther sacs; viscidia orbiculate; ovary slender, mostly 15–30 mm. |
2n | = 42. |
|
Platanthera macrophylla |
Platanthera leucophaea |
|
Phenology | Flowering Jun–Aug. | Flowering Jun–Aug. |
Habitat | Mesic to wet coniferous and deciduous forest | Mesic to wet prairies, marshes, fens, lake shores, old fields |
Elevation | mostly 0–1000 m (mostly 0–3300 ft) | 80–300 m (300–1000 ft) |
Distribution |
CT; MA; ME; MI; MN; NH; NY; PA; VT; NB; NL; NS; ON; PE; QC
|
IA; IL; IN; LA; ME; MI; MO; NE; NJ; NY; OH; OK; VA; WI; ON
|
Discussion | Of conservation concern. A very rare hybrid with Platanthera psycodes, known only from Ontario, is P. ×reznicekii Catling, Brownell & G. Allen. See the discussion under 22. Plantanthera praeclara. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 26. | FNA vol. 26, p. 566. |
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 | Orchis leucophaea, Habenaria leucophaea |
Name authority | (Goldie) P. M. Brown: Wild Fl. Notes 3: 23. (1988) | (Nuttall) Lindley: Gen. Sp. Orchid. Pl., 294. (1835) |
Web links |