Botrychium pinnatum H. St. John
northwestern moonwort (northern moonwort)
Ophioglossaceae (Adder's-tongue family)

Introduction to Vascular Plants


© Ryan Batten     (Photo ID #23782)


E-Flora BC Static Map

Distribution of Botrychium pinnatum
Click here to view the full interactive map and legend

Species Information

Deciduous perennial, 3-15 cm tall.
The only North American collections of Botrychium boreale Milde have been recently collected in Kootenay National Park, SE BC (W.H. Wagner, pers. comm.). It is difficult to separate from B. pinnatum, but the lowermost pinnae have shallow, narrow sinuses (they are wide and deep in B. pinnatum).

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.


Ecological Framework for Botrychium pinnatum

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres)
702 15 2075
Slope Gradient (%)
37 0 90

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

80 50 359
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 0 7
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in

AT(2), BAFA(1), BWBS(1), CMA(1), CWH(12), ESSF(4), ICH(2), MH(3)

Habitat and Range

Mesic to moist stream banks, meadows and heath in the montane and subalpine zones; infrequent throughout BC; N to AK, YT and NT and S to CO, AZ and CA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Botrychium boreale subsp. obtusilobum (Rupr.) R.T. Clausen
Botrychium boreale var. obtusilobum (Rupr.) Broun