Platanthera species

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Scientific Name Platanthera aquilonis USDA PLANTS Symbol PLAQ2
Common Name Green Bog Orchid, Northern Green Orchid ITIS Taxonomic Serial No. 894660
Family Orchidaceae (Orchid) SEINet
Reference
Click Here
Description Life zones and habitat: Montane to alpine (6400 to 12500 ft); marshes, wet meadows, streamsides.
Plant: Erect, single-stem perennial, 2 to 24 inches tall.
Leaves: Three to 5 alternate stalkless leaves 1 to 9 inches long, oblong to lanceolate, gradually becoming bracts higher up on the stem.
Inflorescence: A raceme of 30 to 40 stalkless green/yellow-green flowers about 1/2-inch across with an erect bract beneath; 3 sepals and 3 petals, upper two petals joining with a sepal to form a hood; lower petal forming a lip projecting forward with cylindrical, club-shaped spur from base, shorter than the lip.
Bloom Period: May to August.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and North American Native Orchid Journal, Vol 13.
BONAP Distribution Map
Colorado Status:
Native
Scientific Name Platanthera dilatata var. albiflora USDA PLANTS Symbol PLDIA
Common Name White Bog Orchid, Scentbottle ITIS Taxonomic Serial No. 196400
Family Orchidaceae (Orchid) Flora of North America Ref. Click Here
Description Life zones and habitat: Montane to alpine (7500 to 12500); marshes, streamsides, and moist areas in meadows and woodlands.
Plant: Erect, sturdy perennial, 6 to 60 inches tall, but usually 20 inches tall or less in CO; leafy stem.
Leaves: Two to 5 alternate leaves 2 to 10 inches long; recurved (bending backward), lanceolate to elliptic-lanceolate, gradually becoming linear-lanceolate bracts higher up on the stem.
Inflorescence: A raceme of 10 to 70 bright white, fragrant flowers about 1/2-inch across with 3 sepals and 3 petals (all white), upper two petals joining with a sepal to form a hood; lower petal forms a lip that is broader at the base (“dilated”) than the tip; green spur below is significantly shorter than the lip.
Bloom Period: May to August.
References: "Flora of Colorado" by Jennifer Ackerfield, "Guide to Colorado Wildflowers" by G.K. Guennel, University of Wisconsin Botany Dept., and USFS article by Walter Fertig.
BONAP Distribution Map
N/A
Colorado Status:
Native
Scientific Name Platanthera dilatata var. dilatata USDA PLANTS Symbol PLDID
Common Name White Bog Orchid, Scentbottle ITIS Taxonomic Serial No. 196398
Family Orchidaceae (Orchid) Flora of North America Ref. Click Here
Description Life zones and habitat: Montane to alpine (7500 to 12500); marshes, streamsides, and moist areas in meadows and woodlands.
Plant: Erect, sturdy perennial, 6 to 60 inches tall, but usually 20 inches tall or less in CO; leafy stem.
Leaves: Two to 5 alternate leaves 2 to 10 inches long; recurved (bending backward), lanceolate to elliptic-lanceolate, gradually becoming linear-lanceolate bracts higher up on the stem.
Inflorescence: A raceme of 10 to 70 bright white, fragrant flowers about 1/2-inch across with 3 sepals and 3 petals (all white), upper two petals joining with a sepal to form a hood; lower petal forms a lip that is broader at the base (“dilated”) than the tip; spur below is about the same length or longer than the lip.
Bloom Period: May to August.
References: "Flora of Colorado" by Jennifer Ackerfield, "Guide to Colorado Wildflowers" by G.K. Guennel, University of Wisconsin Botany Dept., and USFS article by Walter Fertig.
BONAP Distribution Map
N/A
Colorado Status:
Native
Scientific Name Platanthera obtusata USDA PLANTS Symbol PLOB
Common Name Blunt-leaf Orchid ITIS Taxonomic Serial No. 43411
Family Orchidaceae (Orchid) SEINet
Reference
Click Here
Description Life zones and habitat: Foothills to subalpine (8000 to 11500 ft); wet, boggy areas, mossy ground; shade to partial sun.
Plant: Erect perennial up to 14 inches tall, but usually 4 to 6 inches tall in CO; leafless stem.
Leaves: One (rarely 2) leaf from base of stem linear-oblanceolate, elliptic, or broadly obovate.
Inflorescence: A lax raceme of 4 to 8 greenish white to yellow-green inverted flowers less than 1/2-inch across with 3 sepals and 3 petals, upper two petals joining with a sepal to form a hood; lower petal forms a narrow lip; slender, conical spur.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and North American Native Orchid Journal, Vol 13.
BONAP Distribution Map
Colorado Status:
Native



© Tom Lebsack 2021