E-Flora BC: Electronic Atlas of the Flora of British Columbia

Gentiana douglasiana Bong.
swamp gentian
Gentianaceae (Gentian family)

Introduction to Vascular Plants

© Jeremy Gatten  Email the photographer   (Photo ID #9142)

E-Flora BC Static Map
Distribution of Gentiana douglasiana
Click here to view our interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.

Annual herb from a taproot; stems erect, several, freely branching, angled, 5-20 cm tall.
Basal leaves few, egg-shaped to elliptic, 5-15 mm long, forming a rosette; stem leaves similar, 5-10 mm long, fused at the base and slightly decurrent.
Inflorescence of solitary flowers or more usually a loose cluster of terminal axillary stalked flowers; corollas white with purplish streaks and stipples, 10-13 mm long, tubular with 5 pointed lobes, the lobes blue on the back, plaits of the sinuses 2/3 the length of the lobes, calyces 4-6 mm long, 1/2 the length of the corollas, lobes 1/2 the length of the tubes; stamens shorter than the corolla tubes; anthers 1 mm long.
Capsules, oblong, wing-margined; seeds dark brown, spindle-shaped, 1.5 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet bogs and meadows from the lowland to alpine zones; common in coastal BC; N to SE AK and S to WA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Gentiana douglasiana

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) 5 307 1090
Slope Gradient (%) 0 15 90
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 354 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 5 8
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: AT(1), CMA(6), CWH(156), MH(35)

Ecological Indicator Information

Very shade-intolerant, submontane to montane, Pacific North American forb; occurrence decreases with increasing continentality. Species occurs in hypermaritime to submaritime cool mesothermal climates on wet to very wet, nitrogen-poor soils. Occasional in semi-terrestrial communities (less frequently in open-canopy forests) on water-collecting sites with surface groundwater table and accumulations of peat. Characteristic of wetlands.

SourceIndicator Plants of Coastal British Columbia (Information applies to coastal locations only)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is cool mesothermal.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References