Jepson eFlora: Taxon page
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Rhododendron occidentale

Higher Taxonomy
Family: EricaceaeView DescriptionDichotomous Key

Habit: Perennial herb, shrub, tree. Stem: bark often peeling distinctively. Leaf: simple or 0, generally cauline, alternate, opposite (whorled), evergreen or deciduous, often leathery, petioled or not; stipules 0. Inflorescence: raceme, panicle, cyme, or flowers 1, terminal or axillary, generally bracted; pedicel often with 2 bractlets. Flower: generally bisexual, generally radial, bell-shaped, cylindric, or urn-shaped; sepals generally (0)4--5, generally free; petals generally (0)4--5, free or fused; stamens (2--5)8--10, free, filaments rarely appendaged, anthers dehiscing by pores or slits, awns 0 or 2(4), seemingly abaxial, reduced or elongate, generally curved; nectary generally present at ovary base, generally disk-like; ovary superior or inferior, chambers generally 1--5, placentas axile or parietal, ovules 1--many per chamber, style 1, stigma head- to funnel-like or lobed. Fruit: capsule, drupe, berry. Seed: generally many, winged or not.
Genera In Family: +- 100 genera, 3000 species: generally worldwide except deserts; some cultivated, especially Arbutus, Arctostaphylos, Rhododendron, Vaccinium. Note: Monophyletic only if Empetraceae included, as treated here. Ledum included in Rhododendron. Non-green plants obtain nutrition from green plants through fungal intermediates.
eFlora Treatment Author: Gary D. Wallace, except as noted
Scientific Editor: Gary D. Wallace, Thomas J. Rosatti.
Genus: RhododendronView DescriptionDichotomous Key

Habit: Shrub to tree, glabrous, hairy, and/or with glandular scale-like hairs. Stem: prostrate to erect, bark thin, sometimes peeling or shredding. Leaf: alternate, evergreen or deciduous, ovate to obovate to elliptic, margin entire, flat to rolled under. Inflorescence: raceme, 1--many-flowered, bracts green to red-brown. Flower: sepals, petals generally 5, corolla radial to bilateral, 1--5 cm, petals free to +- fused, spots or blotch present or 0; anther awns 0; ovary superior. Fruit: capsule, septicidal, dehiscing base to tip or tip to base, placentas axile. Seed: many, fusiform, +- flat to not, wings and/or tails present or 0.
Species In Genus: +- 1000 species: northern hemisphere, tropical Asia, to Australia. Etymology: (Greek: rose tree)
eFlora Treatment Author: Kathleen A. Kron & Walter S. Judd

Rhododendron occidentale (Torr. & A. Gray) A. Gray
Habit: Hairs sparse to dense, glandular or not. Stem: <= 8 m, densely branched, hairy. Leaf: (2.5)3.5--8.2(10.8) cm, (0.8)1.2--2.9(3.6) cm wide, deciduous, margin ciliate. Inflorescence: short, 3--15-flowered, bracts red-brown, margins ciliate or glandular. Flower: corolla widely funnel-shaped, white to pink to salmon, upper petal yellow- to orange-blotched; stamens 5, +- equal. Fruit: longer than wide, dehiscing tip to base. Seed: ovate to fusiform, coat expanded around seed. Chromosomes: 2n=26.
Ecology: Streambanks, ocean bluffs, moist wooded slopes and canyon bottoms, serpentine ridges; Elevation: < 2700 m. Bioregional Distribution: NW (exc NCoRH), CaRH, n SNF, SNH, GV, CCo, SnFrB, n SCoRI, PR; Distribution Outside California: Oregon. Flowering Time: Apr--Aug
eFlora Treatment Author: Kathleen A. Kron & Walter S. Judd
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botanical illustration including Rhododendron occidentale


Citation for this treatment: Kathleen A. Kron & Walter S. Judd 2016. Rhododendron occidentale, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 06, 2016.

Rhododendron occidentale
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© 2013 Julie Kierstead Nelson
Rhododendron occidentale
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© 2009 California Academy of Sciences
Rhododendron occidentale
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© 2009 Julie Kierstead Nelson
Rhododendron occidentale
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© 2009 Barry Breckling
Rhododendron occidentale
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© 2014 Julie Kierstead Nelson
Rhododendron occidentale
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© 2009 Neal Kramer

More photos of Rhododendron occidentale in CalPhotos

Geographic subdivisions for Rhododendron occidentale:
NW (exc NCoRH), CaRH, n SNF, SNH, GV, CCo, SnFrB, n SCoRI, PR;
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.