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

Orobanche fasciculata Nutt.
clustered broomrape
Orobanchaceae (Broom-rape family)

Introduction to Vascular Plants

© Ian Gardiner  Email the photographer   (Photo ID #24329)

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Distribution of Orobanche fasciculata
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Species Information

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Parasitic herb from a coarse, tuber-like, fleshy root; stems single or clustered, short glandular-hairy, yellowish to purplish, 3-20 cm tall.
Basal leaves lacking; stem leaves scaly-bracteate, alternate, short glandular-hairy.
Inflorescence of loose flat-topped, several to many-flowered clusters; corollas yellow to purple-tinged, 1.5-3 cm long, the lips 4-9 mm long, stalked, the leafless stalks 2-15 cm long; calyces 9-11 mm long, the lobes 3-7 mm long, narrow, acute, equaling or slightly shorter than the tubes; anthers smooth or hairy.
Capsules; seeds numerous, angled, net-veined, less than 0.7 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Parasitic, mainly on Artemisia in dry shrublands in the steppe and lower montane zones; frequent in SC BC; rare northward and eastward; N to YT, E to ON, S to IN, MI, CA and N MX.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Orobanche fasciculata

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) 190 974 2013
Slope Gradient (%) 0 35 110
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
30 181 345
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: AT(3), BG(16), BWBS(2), CWH(1), ESSF(2), ICH(1), IDF(19), MS(1), PP(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.

Synonyms and Alternate Names

Anoplanthus fasciculatus (Nutt.) Walp.
Aphyllon fasciculatum (Nutt.) Torr. & A. Gray
Orobanche fasciculata var. fasciculata
Orobanche fasciculata var. franciscana Achey
Orobanche fasciculata var. lutea (Parry) Achey
Orobanche fasciculata var. subulata Goodman
Orobanche fasciculata var. typica Achey
Thalesia fasciculata (Nutt.) Britton
Thalesia lutea (Parry) Rydb.

Taxonomic and Nomenclatural Links

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General References