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

Crepis atribarba A. Heller
slender hawksbeard
Asteraceae (Aster family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #71064)

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Distribution of Crepis atribarba
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Species Information

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General:
Perennial herb from a taproot and woody base; stems erect, 1-2, grey-woolly or sometimes eventually becoming glabrous, 15-70 cm tall.
Leaves:
Basal leaves linear to lanceolate, long-stalked, pinnately or bipinnately divided into linear or lanceolate segments or rarely entire, greyish-woolly or more often nearly glabrous, 10-35 cm long; stem leaves similar to the basal ones, becoming linear and entire upwards.
Flowers:
Heads with strap-shaped flowers, 3-40 in a flat- to round-topped inflorescence; involucres 8-15 mm tall, cylindric; involucral bracts greyish-woolly to nearly glabrous or rarely glabrous, with or without black, glandless bristles on the inner and sometimes the outer bracts, the outer ones 5-10, deltoid, abruptly sharp-pointed, the longest less than 1/2 as long as the 8-10 inner ones, these lanceolate, abruptly sharp-pointed or obtuse; ray flowers yellow, 10-18 mm long.
Fruits:
Achenes usually greenish or rarely brownish, 3-10 mm long, slender, weakly to strongly ribbed, mostly tapering to a slender tip at the apex; pappus white, of hairlike bristles.
Notes:
Two subspecies occur in BC:

1. Plants relatively small, 15-35 cm tall; heads 3-18; involucral bracts with some glandless bristles...................... ssp. atribarba

1. Plants taller, 30-70 cm tall; heads 10-40; involucral bracts nearly or completely devoid of bristles...................... ssp. originalis Babc. & Stebb.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry sandy or gravelly grasslands, shrublands and open forests in the steppe and lower montane zones; common (ssp. originalis) or rare (ssp. atribarba) in S BC east of the Coast-Cascade Mountains; E to AB and S to NV, UT and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Crepis atribarba

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

Minimum

Average

Maximum

Elevation (metres) 238 790 1950
Slope Gradient (%) 0 31 360
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
1 213 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 5
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
893
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: AT(1), BG(259), ESSF(2), ICH(21), IDF(356), MS(27), PP(202), SBS(1)

Climate

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 cool temperate & cool mesothermal.

Synonyms and Alternate Names

Crepis exilis

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References