Epilobium ciliatum subsp. watsonii Raf. (Barbey) Hoch & P.H. Raven
purple-leaved willowherb (fringed willowherb)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants


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E-Flora BC Static Map

Distribution of Epilobium ciliatum subsp. watsonii
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Species Information

Perennial herb, from basal rosettes or fleshy bulblets, lacking rhizomes; stems 15-150 cm tall, simple or branched, generally finely stiff-hairy in lines or spreading-hairy.
Opposite, or alternate above, lance- or lance egg-shaped, 1-15 cm long, finely sharp-toothed to almost entire, veins distinct; stalks 0-8 mm long.
Inflorescence a terminal, leafy-bracted panicle or raceme, finely stiff-hairy, with some spreading and glandular hairs; hypanthium 0.5-2.6 mm long; petals 2-14 mm long, rose-purple to white, notched at tip; sepals 2-7.5 mm long, often reddish; stamens less than or equal to length of pistil; stigmas club- or head-shaped.
Capsules, 1.5-10 cm long, hairy; stalks 0-30 mm long; seeds 0.8-1.9 mm long, longitudinally grooved, tuft of hairs white, 2-8 mm long, readily detaching.
Three subspecies occur in BC:

1. Stem leaves relatively narrow and not crowded around inflorescences; plants usually branched above; petals white to pale pink or purple.................. ssp. ciliatum

1. Stem leaves broad and often crowded around inflorescences; plants usually unbranched above; petals dark purple.

2. Underground scales or buds present; inflorescences loose, extended...................... ssp. glandulosum (Lehm.) Hoch & Raven

2. Underground scales or buds absent; inflorescences more or less flat-topped...................... ssp. watsonii (Barbey) Hoch & Raven

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 Epilobium ciliatum ssp. watsonii

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)
397 2 1260
Slope Gradient (%)
0 0 0

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

Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 5 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

CWH(4), MS(1), SBS(6)

Habitat and Range

Wet to mesic disturbed areas, roadsides, fields and ditches from the lowland to montane zones; common throughout BC (ssp. ciliatum) to infrequent (ssp. glandulosum), or rare (ssp. watsonii) on Vancouver Island and S BC; amphiberingian, N to AK, YT and NT, E to NF and S to CA, TX and NC; E Asia.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Epilobium franciscanum Barbey
Epilobium watsonii Barbey
Epilobium watsonii var. franciscanum (Barbey) Jeps.
Epilobium watsonii var. watsonii