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

Epilobium minutum Lindl. ex Lehm.
small-flowered willowherb (chaparral willowherb)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #11254)

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Distribution of Epilobium minutum
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Species Information

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General:
Annual herb from a short taproot; stems 3-45 cm tall, usually freely branched, nearly glabrous to short stiff-hairy, peeling below.
Leaves:
Mostly opposite, narrowly elliptic to spoon-shaped, 5-20 mm long, nearly glabrous; short-stalked.
Flowers:
Inflorescence few-flowered, flowers short-stalked in axils of somewhat reduced, alternate leaves; hypanthium cup-shaped, scarcely 1 mm long; petals 2-5 mm long, white to rose, notched at tip; sepals 2-4 mm long; stigmas entire, occasionally slightly lobed.
Fruits:
Capsules, linear club-shaped, slightly curved, nearly glabrous, 1-2.5 cm long; seeds 0.8-1 mm long, netted, tuft of hairs pale yellowish.
Notes:
Similar to and often confused with E. foliosum.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Vernally moist rocky bluffs and wet areas and dry rocky slopes and gravelly banks in the lowland to lower montane zones; frequent in S and W BC; S to MT and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Epilobium minutum

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) 137 1282 2305
Slope Gradient (%) 0 33 420
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W] 		20 200 326
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric] 		0 3 8
Modal Nutrient Regime
Class		 C
Number of field plots
 species was recorded in:		 127
Modal BEC Zone Class
 ESSF
All BEC Zones (# of stations/zone) species was recorded in: AT(1), BG(4), BWBS(1), CDF(3), CMA(1), CWH(11), ESSF(37), ICH(14), IDF(19), IMA(1), MS(13), PP(5), SBS(3)

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


Genetic information (NCBI Taxonomy Database)
 International Plant Names Index
 Taxonomic Information from the World Flora Online
 Integrated Taxonomic Information System

Additional Photo Sources

UBC Herbarium Scanned Collection Record
 Images From CalPhoto
UT Austin's Native Plant Database
 Google Image Search
 Flickr Image Search

General References

Google Scholar Search
Family References
 General Botanical References for BC
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2025-02-17 1:20:01 PM ]
Disclaimer: The information contained in the E-Flora atlas pages is derived from expert sources as cited in each section. This information is scientifically based. E-Flora also acts as a portal to other sites via deep links. As always, users should refer to the original sources for complete information. E-Flora BC is not responsible for the accuracy or completeness of the original information.
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