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Montana Field Guide

Montana Field Guides

White Bog Orchid - Platanthera dilatata
Other Names:  Habenaria dilatata


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 5

External Links






 
General Description
Stems 15–70 cm. Leaves cauline, 3–20 cm long, lanceolate. Inflorescence dense, 4–25 cm long with 10 to 50+ flowers; bracts 5–40 mm long. Flowers white; lateral sepals 4–8 mm long; hood 4–6 mm long; lip petal 4–9 mm long, broadened at the base, pendent; spur sac-like to slender, curved, 2–12 mm long. Capsule 8–15 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Platanthera dilatata has three varieties in Montana: albiflora, dilatata, and leucostachya (Lesica 2012). They are separated by the length of the spur relative to the lip of the flower. However, these characteristics are variable and cannot be separated base don ecology or geography. This species can also hybridize with other Platanthera species.

Species Range
Present
 


Range Comments
AK to NL south to CA, NV, UT, CO, IL and NY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 184

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Wet soil of meadows, fens, thickets, open forest, often along streams, ditches; valleys to lower subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
White Bog Orchid — Platanthera dilatata.  Montana Field Guide.  .  Retrieved on , from