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Montana Field Guide

Montana Field Guides

Loesel's Twayblade - Liparis loeselii

Species of Concern

Global Rank: G5
State Rank: S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS: SENSITIVE
BLM:
MNPS Threat Rank: 3
C-value: 10

External Links






State Rank Reason (see State Rank above)
Known from several occurrences clustered in a small area of the Swan Valley. Susceptible to changes in hydrology. May also be susceptible to impacts from fire.
 
General Description
Loesel's Twayblade is a glabrous, herbaceous perennial with naked stems that are up to 15 cm high arising from a bulb-like base. The two nearly erect, narrowly elliptic basal leaves are 5-15 cm long and have a broad petiole and a thickened midrib. Several flowers are borne on short stalks at the tops of the stem. Each white to greenish flower has 3 narrowly lance-shaped sepals that are 5-7 mm long, 2 nearly linear petals, and a strap-shaped lip petal that is 4-5 mm long and narrowed at the base. The petals and sepals are united together at the top of the curved, club-shaped ovary. The fruit is a narrowly elliptic capsule with numerous dust-like seeds.

Phenology
Flowering from June-mid-July.

Diagnostic Characteristics
Liparis loeselii might be confused with species of Platanthera, but flowers of the latter have a tubular spur and lack a short stalk. In addition, species of Platanthera that occur in our fens have leafy stems. Species of Listera usually do not occur in fens, and their two leaves are attached to the stem rather than being basal.

Species Range
Montana Range

Click the legend blocks above to view individual ranges.
 


Range Comments
BC to QC south to WA, MT, LA and VA (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 17

(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, organic soils of calcareous fens in the valley and montane zones.
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habit Model available.

To learn how these Models were created see http://mtnhp.org/models

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Loesel's Twayblade — Liparis loeselii.  Montana Field Guide.  .  Retrieved on , from