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

Lomatium ambiguum (Nutt.) J.M. Coult. & Rose
swale desert-parsley (Wyeth biscuitroot)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #13382)

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Distribution of Lomatium ambiguum
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Species Information

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Stout, glabrous perennial herb from a globose thickened or necklace-like to elongate and slender taproot; stems 10-80 cm tall, erect, sometimes branching.
All basal, compoundly dissected, glabrous; ultimate segments of the leaves narrow and scarcely leaflike, less than 5 mm wide.
Inflorescence of compound umbels; flowers usually yellow or sometimes white, sometimes purple; involucels generally wanting.
Linear to narrowly oblong, mostly 3-8 times as long as wide (less than 4 mm wide), wings evident but narrow, less than 1/3 as wide as the body or obsolete.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry rocky slopes, grasslands and shrublands in the steppe and montane zones; frequent in S BC east of the Coast-Cascade Mountains, rare westward; S to WY, UT and OR.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Lomatium ambiguum

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) 350 990 1858
Slope Gradient (%) 0 35 360
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
14 173 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 1 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: BG(10), ESSF(7), ICH(4), IDF(42), MS(13), PP(22)


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

Peucedanum ambiguum (Nutt.) Nutt. ex Torr. & A. Gray

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References