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

Orobanche uniflora L.
naked broomrape (oneflowered broomrape)
Orobanchaceae (Broom-rape family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #74916)

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Distribution of Orobanche uniflora
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Species Information

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Parasitic herb from a coarse, tuber-like, fleshy root; stems single or clustered, usually smooth except finely glandular-hairy above, 5-15 cm tall.
Basal leaves lacking; stem leaves scaly-bracteate, alternate, lance shaped, smooth.
Inflorescence of single flowers, 1-3 per plant; corollas purplish, sometimes yellowish, 1.5-3.5 cm long, the lips similar to the other lobes, finely fringed, stalked, the leafless stalks 3-12 cm long; calyces 4-12 mm long, the unequal, narrow lobes fringed; 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 on Sedum, Saxifragaceae, Asteraceae and others; moist to dry meadows and forest openings in the lowland, steppe and montane zones; common on SE Vancouver Island and Gulf Islands, infrequent eastward in S BC; E to NF and S to FL, TX and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Orobanche uniflora

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) 31 857 1780
Slope Gradient (%) 0 36 80
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
50 216 340
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 1 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(1), CDF(2), CWH(2), ESSF(2), ICH(4), IDF(2), MS(3), 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

Aphyllon uniflorum (L.) Torr. & A. Gray
Orobanche porphyrantha G. Beck
Orobanche purpurea Jacq.
Orobanche sedii (Suksd.) Fech.
Orobanche terrae-novae Fern.
Orobanche uniflora subsp. occidentalis (Greene) Abrams ex Ferris
Orobanche uniflora var. minuta (Suksd.) G. Beck
Orobanche uniflora var. occidentalis (Greene) Roy L. Taylor & MacBryde
Orobanche uniflora var. purpurea (A. Heller) Achey
Orobanche uniflora var. sedii (Suksdorf) Achey
Orobanche uniflora var. terrae-novae (Fern.) Munz
Orobanche uniflora var. typica Achey
Thalesia uniflora (L.) Britt.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References