Geranium robertianum L.
Robert's geranium (herb-Robert; Robert geranium)
Geraniaceae (Geranium family)

Introduction to Vascular Plants


© Lydia Dani     (Photo ID #74928)


E-Flora BC Static Map

Distribution of Geranium robertianum
Click here to view the full interactive map and legend


This species is listed by the Invasive Species Council of BC as an 'alert' species. That is, one of the "unwanted horticulture plants to be on alert for in BC. Gardeners should avoid purchasing or planting".

Species Information

Annual herb from a taproot; stems decumbent to ascending, branched, spreading-hairy, 10-60 cm tall.
Basal leaves few, reduced and soon deciduous; stem leaves similar, opposite, more or less triangular in outline, spreading-hairy, 1.5-5 cm long, pinnately divided into 3-5 segments, these cleft or toothed 1/2 their length, terminal leaflet stalked; odoriferous.
Inflorescence of terminal and axillary clusters of 2 short-stalked flowers; petals pink to reddish-purple, soft-hairy at least 1/2 their length from the base, rounded at the tips, 8-13 mm long; sepals 6-9 mm long, bristle-tipped, the tip 1-2 mm long; stamens 10, fertile, not fused.
Carpels, 5-parted, short-hairy at the tips; styles 15-25 mm long, beaks 6-7 mm long; seeds oblong, obscurely pitted.

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 Geranium robertianum

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)
125 35 445
Slope Gradient (%)
9 0 55

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

224 45 250
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 3 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

CDF(2), CWH(17)

Habitat and Range

Mesic, open forests and woodlands in the lowland and montane zones; frequent in SW BC, rare in SC BC northward in the Coast Mountains; introduced from Eurasia.

SourceThe Illustrated Flora of British Columbia