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

Geum macrophyllum Willd.
large-leaved avens (largeleaf avens)
Rosaceae (Rose family)

Introduction to Vascular Plants

© Kevin deBoer  Email the photographer   (Photo ID #22025)

E-Flora BC Static Map
Distribution of Geum macrophyllum
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Species Information

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Perennial herb from a short rhizome and stout stem-base, stems erect, 30-100 cm tall, simple, 1 to several, coarse-spreading-hairy.
Basal leaves several, long-stalked, interruptedly pinnately cleft, 10-40 cm long, hairy along the veins beneath, with mostly 5 to 9 main segments, egg-shaped and blunt-toothed, interspersed with several much smaller segments, the terminal segment heart- to kidney-shaped, 3-10 cm long, 3-15 cm wide, many times larger than the several lateral leaflets below, coarsely blunt-toothed and often deeply 3-lobed, rounded or squared-off to heart-shaped at the base; stem leaves alternate, 2 to 5, smaller, unstalked or nearly so, deeply 3-lobed or 3-parted.
Inflorescence an open, bracted terminal cluster of several stalked flowers; corollas yellow, saucer-shaped, the petals 5, broadly egg-shaped, shallowly notched at the tip, 4-7 mm long, calyces 5-lobed, the lobes broadly triangular, bent back, 3-5 mm long, alternating with linear bractlets (sometimes lacking) about 2 mm long; ovaries superior; stamens numerous.
Achenes, numerous, spreading in globe-shaped clusters; achenes ellipsoid, flattened, about 3 mm long, short-hairy, beaked with the 3- to 6-mm long persistent style, which has an S-shaped kink near the tip and is glandular below the kink, hairy or smooth and tardily deciduous above it.
Two subspecies occur in BC:

1. Terminal segment of basal leaves shallowly rounded-lobed and minutely toothed; flower-shoots and -stalks commonly without glands; plants from west of Coast-Cascade Mountains..................... ssp. macrophyllum

1. Terminal segment of basal leaves deeply lobed and coarsely toothed or incised; flower-shoots and -stalks commonly strongly glandular; plants from east of Coast-Cascade Mountains.......................... ssp. perincisum (Rydb.) Hult.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA

Habitat / Range

Moist meadows, fields, clearings, roadsides, streambanks and open forests in the lowland to montane zones; common throughout BC, except in driest parts of interior; amphiberingian, N to AK and NT, E to ON and S to MX; E Asia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Geum macrophyllum

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 1012 2420
Slope Gradient (%) 0 5 110
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 136 360
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), BAFA(2), BG(2), BWBS(61), CDF(2), CMA(3), CWH(83), ESSF(178), ICH(208), IDF(105), IMA(1), MH(7), MS(125), PP(6), SBPS(69), SBS(327), SWB(25)

Ecological Indicator Information

A shade-intolerant, submontane to subalpine, Asian and North American forb distributed in the Pacific, Cordilleran, and Atlantic regions. Occurs on fresh to very moist, nitrogen-rich soils (Moder and Mull humus forms), often with a fluctuating groundwater table. Widespread in subalpine boreal, temperate, and cool mesothermal climates; its occurrence decreases with increasing elevation. Usually inhabits exposed mineral soil; sporadic in open-canopy, broad-leaved forests on water­receiving (floodplain, seepage, and stream­edge) sites; scattered in early-seral communi­ties. A nitrophytic species characteristic of disturbed sites.

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 not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References