Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Gary D. Wallace, except as specified

Perennial, shrub, tree
Stem: bark often peeling distinctively
Leaves simple, generally cauline, alternate, opposite, rarely whorled, evergreen or deciduous, often leathery, petioled or not; stipules 0
Inflorescence: raceme, panicle, cyme, or flowers solitary, generally bracted; pedicels often with 2 bractlets
Flower generally bisexual, generally radial; sepals generally 4–5, generally free; petals generally 4–5, free or fused; stamens 8–10, free, filaments rarely appendaged, anthers awned or not, dehiscent by pores or slits; nectary generally at ovary base, 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
Seeds generally many, sometimes winged
Genera in family: ± 100 genera, 3000 species: generally worldwide except deserts; some cultivated, especially Arbutus, Arctostaphylos, Rhododendron, Vaccinium
Reference: [Wallace 1975 Wasmann J Biol 33:1–88; 1975 Bot Not 128:286–298]
Subfamilies Monotropoideae, Pyroloideae, Vaccinioideae sometimes treated as families. Nongreen plants obtain nutrition from green plants through fungal intermediates.


Shrub, tree, glabrous to hairy
Stem prostrate to erect; bark generally thin
Leaves alternate, evergreen or deciduous; margin entire to serrate
Inflorescence umbel-like; bud scales deciduous; bracts, bractlets scarious; pedicels not jointed to flower
Flower radial to bilateral, generally showy; sepals generally 5, fused at base; petals generally 5, ± 3/4 fused, shallowly bell- to funnel-shaped; stamens 5–10(16), generally exserted, anthers elongate, each chamber dehiscent by terminal pore, unawned; ovary superior, chambers generally 5(4–12), placentas axile
Fruit: capsule, septicidal, dehiscent tip to base
Seeds many per chamber, fusiform or not; wing 0 or wide
Species in genus: ± 1000 species: temp n hemisphere, Australia
Etymology: (Greek: rose tree)


R. occidentale (Torr. & A. Gray) A. Gray


Stem densely branched, < 5 m; twigs slender
Leaf 3–9 cm, 1–3 cm wide, elliptic to obovate; upper surface light green, midvein not sunken; base wedge-shaped; margin ciliate
Flower < 5 cm
Chromosomes: 2n=26
Ecology: Streambanks, seeps, coniferous forests
Elevation: < 2200 m.
Bioregional distribution: North Coast, Klamath Ranges, Outer North Coast Ranges, Inner North Coast Ranges, High Cascade Range, High Sierra Nevada, Central Coast, San Francisco Bay Area, n Inner South Coast Ranges, Peninsular Ranges
Distribution outside California: Oregon
Horticultural information: IRR or WET, DRN: 4, 5, 6, 15, 16, 17 &SHD: 3, 7, 14, 19, 20, 21, 22, 23, 24; CVS.

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bioregional map for RHODODENDRON%20occidentale being generated
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Rhododendron occidentale
Retrieve dichotomous key for Rhododendron
Overlay Consortium of California Herbaria specimen data by county on this map
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