Platanthera macrophylla

Plants 23–63 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. Spikes 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 linearlanceolate, without basal thickening, 10–23 × 1–2.5 mm, margins entire; spur slenderly clavate, 28–46 mm; rostellum lobes directed strongly forward, widespreading, 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.

Phenology: Flowering Jun–Aug.
Habitat: Mesic to wet coniferous and deciduous forest
Elevation: mostly 0–1000 m

N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Conn., Maine, Mass., Mich., Minn., N.H., N.Y., Pa., Vt.

Discussion

Selected References

None.

Lower Taxa