OregonFlora: Platanthera grandiflora vs. Platanthera

	Platanthera grandiflora	Platanthera
		bog orchid, fringed orchid, rein orchid
Habit		Herbs perennial, to 100 cm tall.
Stems		erect, delicate to robust, green.
Leaves		basal to cauline, 1–several, elliptic, lanceolate, oblanceolate or ovate, becoming reduced towards inflorescence.
Inflorescences		lax to dense terminal racemes with 2–100 or more flowers.
Flowers		upside down due to twisting of pedicel; more or less spreading; dorsal sepal and lateral petals often converging and forming a hood over the short column; sepals ovate, elliptic; to lanceolate; petals ovate to lanceolate; lip entire; spur present and distinct, linear-elliptic to lanceolate; stamen 1.
Fruits		elliptic to ellipsoidal.

	Platanthera grandiflora	Platanthera
Distribution	[WildflowerSearch map] [BONAP county map]	[BONAP county map]
Discussion		Circumboreal in predominantly temperate woodlands, meadows, fens, bogs, coastal bluffs, montane forests, some tropical forests. 100–200 species; 11 species treated in Flora. Although separated by some authorities, recent molecular studies have consistently shown the segregate genus Piperia as being nested within an expanded Platanthera.
Source		Flora of Oregon, volume 1, page 325 James Riser
Sibling taxa	P. aquilonis, P. dilatata, P. elegans, P. elongata, P. ephemerantha, P. huronensis, P. obtusata, P. sparsiflora, P. stricta, P. transversa, P. unalascensis
Subordinate taxa		P. aquilonis, P. dilatata, P. elegans, P. elongata, P. ephemerantha, P. huronensis, P. obtusata, P. sparsiflora, P. stricta, P. transversa, P. unalascensis
Web links	Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Platanthera grandiflora

Platanthera

bog orchid, fringed orchid, rein orchid

Habit

Herbs perennial, to 100 cm tall.

Stems

erect, delicate to robust, green.

Leaves

basal to cauline, 1–several, elliptic, lanceolate, oblanceolate or ovate, becoming reduced towards inflorescence.

Inflorescences

lax to dense terminal racemes with 2–100 or more flowers.

Flowers

upside down due to twisting of pedicel; more or less spreading;

dorsal sepal and lateral petals often converging and forming a hood over the short column;

sepals ovate, elliptic; to lanceolate;

petals ovate to lanceolate;

lip entire;

spur present and distinct, linear-elliptic to lanceolate;

stamen 1.

Fruits

elliptic to ellipsoidal.

Platanthera grandiflora

Platanthera

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Circumboreal in predominantly temperate woodlands, meadows, fens, bogs, coastal bluffs, montane forests, some tropical forests. 100–200 species; 11 species treated in Flora.

Although separated by some authorities, recent molecular studies have consistently shown the segregate genus Piperia as being nested within an expanded Platanthera.

Source

Flora of Oregon, volume 1, page 325
James Riser

Sibling taxa