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Philadelphus lewisii

Higher Taxonomy
Family: HydrangeaceaeView DescriptionDichotomous Key

Habit: Perennial herb to small tree or vine. Stem: < 3 m, generally erect; bark generally peeling as thin sheets or narrow strips. Leaf: generally simple, opposite, deciduous or not, +- hairy; stipules 0; blade +- round to narrowly elliptic, entire or toothed. Inflorescence: cyme, raceme, panicle, or flower 1, terminal or axillary, generally bracted. Flower: bisexual, radial, flowers on inflorescence margins occasionally sterile and enlarged; sepals 4--10, free or fused at base, spreading or erect; petals 4--7, free, +- round to narrowly elliptic; stamens 8--12 in 2 whorls or many and clustered, filament base linear or wide and flat; pistil 1, ovary superior to inferior, chambers 2--8, ovules 1--2 or many per chamber, placentas axile or parietal, styles 1--8, free or fused at base. Fruit: capsule, loculicidal or septicidal; styles persistent or not. Seed: generally many, small to minute, oblong to fusiform, winged or not.
Genera In Family: 18 genera, +- 250 species: generally temperate, subtropical northern hemisphere; some cultivated for ornamental (Carpenteria, Hydrangea, Philadelphus). Note: Philadelphaceae in TJM (1993).
eFlora Treatment Author: Robert E. Preston & Charles F. Quibell
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: PhiladelphusView DescriptionDichotomous Key

Common Name: MOCK ORANGE
Habit: Shrub < 3 m. Stem: bark red-brown, aging gray, peeling as narrow rectangles or strips; twigs glabrous to hairy. Leaf: deciduous, petioled; blade 3-veined from base, +- glabrous to hairy, margin entire to toothed. Inflorescence: flower 1, or raceme to panicle, terminal, +- open. Flower: fragrant; sepals 4--5, glabrous to hairy; petals 4--5, white; stamens generally many, clustered, filaments linear, fused at base; ovary 1/2 to completely inferior, chambers 4--5, placentas axile, ovules many, style 1, branches generally 4, stigmas linear along style branches. Fruit: becoming woody, generally loculicidal. Seed: many, generally fusiform, generally brown.
Species In Genus: +- 65 species: temperate America, Eurasia. Etymology: (Greek: for Ptolemy Philadelphus, Greek king of Egypt, 309--247 BC) Note: Many intergrading infraspecific taxa described; more study needed to determine which warrant recognition.

Philadelphus lewisii Pursh
Leaf: petiole 3--8 mm; blade 20--40 mm wide, ovate, margin entire to toothed, flat. Flower: sepals 4--7 mm; petals 8--12 mm, obovate to oblong. Chromosomes: 2n=26.
Ecology: Slopes, canyons in conifer and hardwood forest, montane chaparral; Elevation: 30--2440 m. Bioregional Distribution: NW, CaR, n&c SN, s SNH, ScV (Sutter Buttes), SnGb, PR (Santa Ana Mtns); Distribution Outside California: to British Columbia, Montana. Flowering Time: May--Jul
Synonyms: Philadelphus californicus Benth.; Philadelphus lewisii subsp. californicus (Benth.) Munz; Philadelphus lewisii subsp. gordonianus (Lindl.) Munz
eFlora Treatment Author: Robert E. Preston & Charles F. Quibell
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botanical illustration including Philadelphus lewisii


Citation for this treatment: Robert E. Preston & Charles F. Quibell 2016. Philadelphus lewisii, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 29, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 29, 2016.

Philadelphus lewisii
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© 2009 Barry Breckling
Philadelphus lewisii
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© 2003 Christopher L. Christie
Philadelphus lewisii
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© 2007 George W. Hartwell
Philadelphus lewisii
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© 2010 Barry Breckling
Philadelphus lewisii
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© 2009 Keir Morse
Philadelphus lewisii
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© 2010 Barry Breckling

More photos of Philadelphus lewisii in CalPhotos

Geographic subdivisions for Philadelphus lewisii:
NW, CaR, n&c SN, s SNH, ScV (Sutter Buttes), SnGb, PR (Santa Ana Mtns);
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.