Jepson eFlora: Taxon page
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Leptosiphon ambiguus

Higher Taxonomy
Family: PolemoniaceaeView DescriptionDichotomous Key

Habit: Annual, perennial herb, shrub, vine. Leaf: simple or compound, cauline (or most basal), alternate or opposite; stipules 0. Inflorescence: cymes, heads, clusters, or flower 1; bracts in involucres or not. Flower: sepals generally 5, fused at base, translucent membrane generally connecting lobes, torn by fruit; corolla generally 5-lobed, radial or bilateral, salverform to bell-shaped, throat often well defined; stamens generally 5, epipetalous, attached at >= 1 level, filaments of >= 1 length, pollen white, yellow, blue, or red; ovary superior, chambers generally 3, style 1, stigmas generally 3. Fruit: capsule. Seed: 1--many, when wetted swelling or not, gelatinous or not.
Genera In Family: 26 genera, 314 species: America, northern Europe, northern Asia; some cultivated (Cantua, Cobaea (cup-and-saucer vine), Collomia, Gilia, Ipomopsis, Linanthus, Phlox). Note: Leptodactylon moved to Linanthus.
eFlora Treatment Author: Robert Patterson, family description, key to genera
Scientific Editor: Robert Patterson, Thomas J. Rosatti.
Genus: LeptosiphonView DescriptionDichotomous Key

Habit: Annual, perennial herb. Stem: generally erect, generally branched from base. Leaf: cauline, opposite, entire or lobes 3--9, palmate, linear to narrowly lanceolate or spoon-shaped, generally not fused by membrane. Inflorescence: head, open clusters, few-flowered cyme, or flower 1; bracts +- leaf-like, generally palmate-lobed, lobes generally not connected by translucent membrane; flowers sessile or not. Flower: sepals generally equal; corolla funnel-shaped, salverform, or bell-shaped, with hairy ring inside tube or generally not (determined at 10×); stamens attached at 1 level, pollen yellow.
Species In Genus: 30 species: western North America, Chile. Etymology: (Greek: narrow tube, for corollas of some species) Note: Calyx lobe membrane generally expressed as length relative to calyx or lobe length, or as width relative to calyx lobe.
eFlora Treatment Author: Robert Patterson & Robyn Battaglia

Leptosiphon ambiguus (Rattan) J.M. Porter & L.A. Johnson
Habit: Annual, glabrous or hairy. Stem: 10--20 mm, thread-like. Leaf: lobes 3--5 mm, narrowly lanceolate. Inflorescence: few-flowered cyme or flower 1; pedicel 5--25 mm, thread-like. Flower: calyx 3--6 mm, generally hairy, membrane generally = calyx; corolla funnel-shaped, tube 3--6 mm, purple, with wide hairy ring inside near throat, throat 3 mm, generally maroon, lobes 4--6 mm, lanceolate, pink, bases yellow, occasionally with white distal to yellow; stamens attached above hairy ring, exserted; stigmas 1--2 mm. Chromosomes: 2n=18.
Ecology: Grassy areas generally on serpentine soil; Elevation: < 1000 m. Bioregional Distribution: SnJV, SnFrB, SCoRI. Flowering Time: Apr--May
Synonyms: Linanthus ambiguus (Rattan) Greene
eFlora Treatment Author: Robert Patterson & Robyn Battaglia
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

Previous taxon: Leptosiphon acicularis
Next taxon: Leptosiphon androsaceus

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Citation for this treatment: Robert Patterson & Robyn Battaglia 2016. Leptosiphon ambiguus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 04, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 04, 2016.

Leptosiphon ambiguus
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© Bob Patterson and CNPS
Leptosiphon ambiguus
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© 2010 Aaron Schusteff
Leptosiphon ambiguus
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© 2010 Neal Kramer
Leptosiphon ambiguus
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© 2015 Neal Kramer
Leptosiphon ambiguus
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© 2013 Barry Breckling
Leptosiphon ambiguus
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© 2010 Aaron Schusteff

More photos of Leptosiphon ambiguus in CalPhotos

Geographic subdivisions for Leptosiphon ambiguus:
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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.