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

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

Introduction to Vascular Plants

© Lydia Dani  Email the photographer   (Photo ID #74928)

E-Flora BC Static Map
Distribution of Geranium robertianum
Click here to view our interactive map and legend
Details about map content are available here
Click on the map dots to view record details.


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

Click on the image below to view an expanded illustration for this species.

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.

Source: The Illustrated Flora of British Columbia

Habitat / 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.

Source: The Illustrated Flora of British Columbia


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) 35 125 445
Slope Gradient (%) 0 9 55
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
45 224 250
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 5 7
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: CDF(2), CWH(17)


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

Additional Photo Sources

General References