Jepson eFlora: Taxon page
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Orobanche uniflora

Higher Taxonomy
Family: OrobanchaceaeView DescriptionDichotomous Key

Habit: Annual, perennial herb, shrub; often glandular; root-parasites, roots modified into absorptive structures. Stem: generally round in ×-section. Leaf: generally simple, generally alternate, reduced to +- fleshy scales in non-green plants lacking chlorophyll; stipules generally 0. Inflorescence: spike to panicle, generally bracted, or flowers 1--2 in axils. Flower: bisexual; calyx lobes 0--5; corolla generally strongly bilateral, generally 2-lipped (upper lip generally 2-lobed, lower lip generally 3-lobed), abaxial lobes outside other lobes in bud; stamens epipetalous, 4 in 2 pairs (sometimes 1 pair sterile), additional staminode 0(1), anther sacs unequal; ovary superior, chambers 1--2, placentas 2--4, parietal, style 1, stigma lobes 0 or 2. Fruit: capsule, generally +- ovoid, loculicidal, valves 2--4. Seed: many, small, angled; surface smooth or netted.
Genera In Family: 99 genera, 2060 species: worldwide, especially northern temperate and Africa. Note: High yield losses in many crops caused by Orobanche species in Africa, Mediterranean, Middle East, and eastern Europe.
eFlora Treatment Author: Margriet Wetherwax, except as noted
Scientific Editor: Robert Patterson, Bruce G. Baldwin.
Genus: OrobancheView DescriptionDichotomous Key

Common Name: BROOMRAPE
Habit: Annual, perennial herb, not green (holoparasites), generally glandular-puberulent distally; root attachment occasionally tuber-like. Stem: simple or branched. Inflorescence: generally +- spike-like (proximal flowers often short-pedicelled or on short branches), generally dense; flowers generally > 20; bracts generally lanceolate to deltate (wider on peduncle); bractlets 0 or 2. Flower: calyx lobes 4--5; corolla glandular-puberulent, generally lacking ring of hairs at stamen bases, upper lip erect to reflexed, 2-lobed, lower lip 3-lobed, spreading, throat floor with yellow folds; anthers glabrous to hairy; stigma lobes generally 2. Fruit: 2-valved; placentas generally 2, often lobed. Seed: < 0.7 mm.
Species In Genus: 140 species: worldwide, especially Mediterranean. Etymology: (Greek: vetch strangler, from parasitic habit)
eFlora Treatment Author: Alison E.L. Colwell & Lawrence R. Heckard
Reference: Heckard 1973 Madroño 22:41--70

Orobanche uniflora L.
Stem: 0.5--5 cm. Inflorescence: generally raceme; flowers generally 1--3; bracts generally < 6, generally glabrous; pedicels 3--12 cm, scapose, bractlets 0. Flower: calyx lobes 5, generally 4--8 mm, > tube, narrowly triangular; corolla 12--35 mm, +- horizontal, generally pale +- purple to +- yellow, lobes generally rounded, minutely ciliate; anthers generally hairy; stigma lobes 2, margins recurved; orange nectary gland at base of ovary. Chromosomes: 2n=36,48,+-70.
Ecology: Generally moist places, on herbs, especially Sedum, Saxifragaceae, Asteraceae; Elevation: < 3100 m. Bioregional Distribution: NW, CaR, SN, ScV (Sutter Buttes), CW, SCo, n ChI, Wrn; Distribution Outside California: to Yukon Territory, eastern North America. Flowering Time: Apr--Jul Note: If recognized taxonomically, plants < 20 cm of northern and central California to Canada with corollas deep violet, 25--35 mm, assignable to Orobanche uniflora var. purpurea (A. Heller) Achey.
eFlora Treatment Author: Alison E.L. Colwell & Lawrence R. Heckard
Reference: Heckard 1973 Madroño 22:41--70
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Next taxon: Orobanche valida

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botanical illustration including Orobanche uniflora


Citation for this treatment: Alison E.L. Colwell & Lawrence R. Heckard 2012, Orobanche uniflora, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on November 22, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017, Jepson eFlora,, accessed on November 22, 2017.

Orobanche uniflora
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© 2008 Keir Morse
Orobanche uniflora
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© 2017 Aaron Schusteff
Orobanche uniflora
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© 2017 Neal Kramer
Orobanche uniflora
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© 2009 Barry Breckling
Orobanche uniflora var. purpurea
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© 2012 Gary A. Monroe
Orobanche uniflora
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© 2005 Steve Matson

More photos of Orobanche uniflora in CalPhotos

Geographic subdivisions for Orobanche uniflora:
NW, CaR, SN, ScV (Sutter Buttes), CW, SCo, n ChI, Wrn;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.