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

Phacelia linearis (Pursh) Holz.
thread-leaved phacelia (threadleaf phacelia)
Hydrophyllaceae (Waterleaf family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #86681)

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Distribution of Phacelia linearis
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Species Information

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Annual herb from a taproot; stems simple or branched, erect, densely short-hairy, 10-50 cm tall.
Basal leaves few, reduced, soon deciduous; stem leaves alternate, linear to narrowly lanceolate, entire except for 1-4 divergent lobes which may occur below the middle, appressed stiff-hairy, 1.5-11 cm long.
Inflorescence a crowded, terminal cluster; corollas lavender-blue, 6-10 mm long, 8-18 mm wide; calyces fringed with bristly hairs, the lobes linear; stamens slightly exserted, sparsely bearded.
Capsules; seeds 6-15, coarsely pitted, 1.5 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry meadows, grasslands, shrublands and open forests in the lowland, steppe and lower montane zones; common in SC and SE BC; infrequent on S Vancouver Island and the Gulf Islands; E to SW AB and S to WY, UT and N CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Phacelia linearis

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) 250 691 1816
Slope Gradient (%) 0 33 102
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
4 195 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 6
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(106), ESSF(1), ICH(8), IDF(78), MS(5), PP(94)


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