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

Rudbeckia hirta L.
black-eyed susan (blackeyed susan)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #19882)

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Distribution of Rudbeckia hirta
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Rudbeckia hirta var. pulcherrima

Species Information

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Biennial to short-lived perennial herb from a thick, woody stem-base; stems erect, solitary to several, simple or few-branched above, rough-hairy, 30-100 cm tall.
Basal leaves soon deciduous; stem leaves alternate, oblanceolate to elliptic, entire to toothed, 3-15 cm long, 1-3 cm wide, long-stalked near the bases, becoming unstalked, lanceolate to egg-shaped and reduced upwards.
Heads with ray and disk flowers, solitary at the ends of branches; disks hemispheric or egg-shaped, dark purple or brown, 10-20 mm wide; involucral bracts 6-10 mm, lanceolate, reflexed when mature, long-hairy; ray flowers orange, 8-20, darker at the tips, reflexed, 2-4 cm long; disk flowers purple or brown; receptacular bracts abruptly sharp-pointed, hairy near the tip.
Achenes oblong, glabrous, 1.8-2 mm long; pappus lacking.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

Moist to mesic fen edges, dry roadsides and disturbed areas in the lowland, steppe and montane zones; infrequent in S BC; introduced from central U.S.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Rudbeckia hirta

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) 1470 1470 1470
Slope Gradient (%) 12 12 12
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
180 180 180
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 4 4
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: ESSF(1)


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