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

Hypericum scouleri Hook.
western St. John's-wort (Scouler's St. Johnswort)
Clusiaceae

Introduction to Vascular Plants

© Derek Marcoux  Email the photographer   (Photo ID #14255)

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Distribution of Hypericum scouleri
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Species Information

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PDCLU030Q1
PDCLU030Q2


General:
Perennial herb from a long stolon and rhizome; stems erect, branched above, glabrous, 5-80 cm tall.
Leaves:
Stem leaves oblong to rounded, unstalked, obtuse, 1-3 cm long, 0.5-1.5 cm wide, glabrous with black marginal dots.
Flowers:
Inflorescence up to 50+ flowered; petals pale to bright yellow, 7-12 mm long; sepals narrowly egg-shaped to triangular, obtuse, 3-4 mm long; stamens 75-100, united basally into 3 groups; styles 3, 3-5 mm long.
Fruits:
Membranous capsules, 6-9 mm long; seeds yellow to brownish, about 0.8 mm long, finely net-veined and longitudinally grooved.
Notes:
Two subspecies occur in Bcd:

1. Stems few branched in the inflorescence, mostly 5-20 cm tall; leaves rounded; plants infrequent at higher elevations in S BC, most common in SE BC....................... ssp. nortoniae (M.E. Jones) J. Gillett

1. Stems branched below the inflorescence, mostly 20-80 cm tall; leaves narrowly egg-shaped; infrequent at lower elevations in S BC, most common in SW BC..........................ssp. scouleri

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to wet streamsides, estuaries, marshes and open slopes in all zones except the alpine and steppe zones; infrequent in S BC; S to WY, CA and MX.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Hypericum scouleri

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

Minimum

Average

Maximum

Elevation (metres) 61 993 2390
Slope Gradient (%) 0 20 60
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
56 174 240
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 5 8
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
16
Modal BEC Zone Class
CWH
All BEC Zones (# of stations/zone) species was recorded in: CDF(1), CWH(6), ESSF(6), IDF(1), PP(1)

Climate

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 not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References