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

Polemonium micranthum Benth.
littlebells polemonium (annual Jacob's-ladder; annual polemonium)
Polemoniaceae (Phlox family)

Introduction to Vascular Plants

© Reg Newman  Email the photographer   (Photo ID #12226)

E-Flora BC Static Map
Distribution of Polemonium micranthum
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Species Information

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Slender annual herb from a taproot; stems simple and erect to freely branched and spreading, soft-glandular-hairy or partly hairless, 5-30 cm tall.
Alternate, pinnately compound; leaflets 7 to 15, opposite or offset, egg-shaped to elliptic, 2-9 mm long, 1-4 mm wide.
Inflorescence open, of solitary terminal flowers that are soon opposed by a leaf, flower-stalks short at first but elongating to 1-2 cm; corollas white, saucer-shaped, 2-5 mm long, the 5 lobes about equal to the tube; calyces 3-7 mm long, hairy, the 5 pointed lobes slightly longer than the tube.
Capsules, 3-chambered.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Vernally moist to dry disturbed areas in the steppe and lower montane zones; locally frequent in SC BC; S to MT, UT and CA; Argentina, Chile.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Polemonium micranthum

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) 330 566 1190
Slope Gradient (%) 0 26 360
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
17 24 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 3 5
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: BG(26), IDF(8), PP(9)


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.

Synonyms and Alternate Names

Polemoniella micrantha (Benth.) A. Heller

Taxonomic and Nomenclatural Links

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Related Databases

General References