Rhododendron Species


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R. occidentale

SubgenusPentanthera
SectionPentanthera
SubsectionPentantheraClick to see all Pentanthera
Synonyms
Azalea calendulacea
Azalea californica   (Torr.
John Torrey
(1796-1873)
USA, New York
Botanical-short: Torr.
& A.Gray
Asa Gray
(1810-1888)
Sauquoit, New York, USA
Botanical-short: A.Gray
)
Azalea nudiflora var ciliata
R. occidentale var paludosum
R. occidentale var sonomense
R. sonomense   (Greene
Edward Lee Greene
(1843-1915)
Yreka, California, USA
Botanical-short: Greene
)
In cultivation since: 1851

First described: 1876, (A.Gray
Asa Gray
(1810-1888)
Sauquoit, New York, USA
Botanical-short: A.Gray
)

Origin: W. USA, S. California north to mid coastal Oregon, mostly coastal 0-2700 meter

Corolla: broadly funnel-shaped
Leaves: oblanceolate

Habit: terrestrial
epiphytic = living on dead organic material (decaying trees f.i)
terrestrial = in soil (like in your garden)

Winter: deciduous
Bloomtime: late midseason
Hardiness: H5
H0 = 0 C (32 F)
H1 = -7 C (20 F)
H2 = -12 C (10 F)
H3 = -15 C (5 F)
H4 = -18 C (0 F)
H5 = -24 C (-10 F)


Predominant color: white

Height
Height
The figures listed here are the observed size in the natural environment.

The exact location (altitude, sunlight, soil, climate) can influence growth considerably
: 900 cm. (30ft.)

Extra information.

Registered
In 'Your Garden' you can administrate
your rhododendrons.

To try/see this go 'Home' (top-right).
on hirstum.info: 85
R. occidentale per country:
(could be a clue for heat/cold-tolerance)

United States : 68
Canada : 9
Netherlands : 7
Sweden : 1

Common names
Pacific Azalea
Western Azalea


Natural Hybrids
Perhaps =(occidentale x macrophyllum)

Clones / selections
'Brandon Sunset', 1975, Magness, W.R., Brandon, Oregon, USA
'collectors nr. 2904', 1995, Cavender, R.W., Red's Rhodies, Sherwood, Oregon, USA
'collectors nr. 3704', 2003, Cavender, R.W., Red's Rhodies, Sherwood, Oregon, USA
'Crescent City Double', 1966, Smith, B.M. & Mossman, F.D., ,
'Crescent City Gold', 1966, Smith, B.M. & Mossman, F.D., ,
'Double Dig Twelve', 1968, Smith, B.M. & Mossman, F.D., ,
'Humboldt Picotee', 1968, Smith, B.M. & Mossman, F.D., ,
'Langlois Milk Maid', 1965, Frisbie, L.F., Tacoma, Washington, USA
'Leonard Frisbie', 1968, Mossman, F. D., Vancouver, Washington, USA
'Miniskirts', 1976, Smith, B.M. & Mossman, F.D., ,
'Ocean Gold', 1965, Frisbie, L.F., Tacoma, Washington, USA
'Ocean Mist', 1965, Frisbie, L.F., Tacoma, Washington, USA
'Pistil Packin' Mama', 1974, Slonecker, H.J., Milwaukie, Oregon, USA
'Pistil Pete', 1974, Slonecker, H.J., Milwaukie, Oregon, USA
'Rogue River Bell', 1965, Frisbie, L.F., Tacoma, Washington, USA
'Stagecoach Cream', 1969, Smith, B.M. & Mossman, F.D., ,
'Stagecoach Frills', 1969, Smith, B.M. & Mossman, F.D., ,
'Tatum's Deep Pink', 1974, Tatum, T., Portland, Oregon, USA
'Tatum's Yellow Standard', 1973, Tatum, T., Portland, Oregon, USA


Send questions, information or pictures

Rhododendron occidentale
Photo byHank Helm
Date
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron occidentale
Photo byStaffan Bodn
Date09 June, 2013
LocationPrivate Garden, Sjbo, Sweden
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Rhododendron occidentale
Photo byCoen Zonneveld
Date16 May, 2004
Locationprivate garden Groede, Netherlands
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Rhododendron occidentale
form with yellow on all lobes similar to Smith Mossman #30
Photo byHank Helm
Date
LocationPrivate garden, Bainbridge Island, WA, USA
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Rhododendron occidentale
Photo byEverard Daniel
Date02 June, 2008
Locationgarden of the late Mike Robinson, Forest Row, East Sussex, UK
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Rhododendron occidentale
Photo byCoen Zonneveld
Date17 May, 2002
LocationDiepenveen, Netherlands
Rhododendron occidentale
Photo byStaffan Bodn
Date12 June, 2013
LocationPrivate Garden, Sjbo, Sweden
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Rhododendron occidentale
Photo byHank Helm
Date
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron occidentale
Photo byHank Helm
Date19 May, 2007
LocationAzalea Stae Park, California, USA
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Rhododendron occidentale
Photo byHank Helm
Date19 May, 2007
LocationAzalea Stae Park, California, USA
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Rhododendron occidentale
Photo byHank Helm
Date20 May, 2007
LocationBookings Oregon Rhododendron Park, USA
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Rhododendron occidentale
Photo byHank Helm
Date20 May, 2007
LocationBookings Oregon Rhododendron Park, USA
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Rhododendron occidentale
Photo byHank Helm
Date15 May, 2007
LocationBig Basin Redwood State Park, California, USA
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Rhododendron occidentale
Photo byHank Helm
Date02 May, 2013
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron occidentale
Photo byHank Helm
Date19 May, 2007
Locationin the wild, Stagecoach Hill, California, USA
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Rhododendron occidentale
Photo byHank Helm
Date19 May, 2007
Locationin the wild, Stagecoach Hill, California, USA
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Rhododendron occidentale
Photo byHank Helm
Date20 May, 2007
Locationin the wild, near Gold Beach, Oregon, USA
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Rhododendron occidentale
Photo byHank Helm
Date20 May, 2007
Locationin the wild, near Gold Beach, Oregon, USA
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Rhododendron occidentale
Photo byHank Helm
Date20 May, 2007
Locationin the wild, near Gold Beach, Oregon, USA
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Rhododendron occidentale
Photo byHank Helm
Date13 May, 2007
Locationin the wild near Trinidad, USA
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Rhododendron occidentale
Photo byHank Helm
Date13 May, 2012
Locationin the wild near Trinidad, USA
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Rhododendron occidentale
Photo byHank Helm
Date13 May, 2007
Locationin the wild near Trinidad, USA
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Rhododendron occidentale
Photo byHank Helm
Date08 May, 2013
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron occidentale
Photo byHank Helm
Date20 May, 2007
LocationBookings Oregon Rhododendron Park,USA
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Rhododendron occidentale
Photo byHank Helm
Date15 May, 2007
LocationBig Basin Redwood State Park, California, USA
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Rhododendron occidentale
Fall leaves
Photo byHank Helm
Date14 October, 2012
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron occidentale
Fall leaves
Photo byHank Helm
Date14 October, 2012
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron occidentale
Photo byHerman Van Ree
Date26 October, 2009
LocationArboretum Belmonte, Wageningen, Netherlands
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occidentale 'Crescent City Double'
Rhododendron occidentale
Photo byDick Cavender
Date
LocationRed's Rhodies, Sherwood Oregon USA
occidentale 'Crescent City Gold'
Rhododendron occidentale
SM 30
Photo byHank Helm
Date23 June, 2011
LocationSmith Mossman Garden, South King County, Washington USA
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occidentale 'Crescent City Gold'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
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occidentale 'Humboldt Picotee'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
occidentale 'Humboldt Picotee'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
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occidentale 'Miniskirts'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
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occidentale 'Pistil Packin' Mama'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
occidentale 'Pistil Pete'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
occidentale 'Leonard Frisbie'
Rhododendron occidentale
Photo byHank Helm
Date
LocationHank Helm Garden, Bainbridge Island, WA, USA
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occidentale 'Leonard Frisbie'
Rhododendron occidentale
Photo byHank Helm
Date
LocationHank Helm Garden, Bainbridge Island, WA, USA
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occidentale 'Leonard Frisbie'
Rhododendron occidentale
DSCN1212
Photo byHank Helm
Date
LocationHank Helm Garden, Bainbridge Island, WA, USA
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occidentale 'Double Dig Twelve'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
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occidentale 'Tatum's Yellow Standard'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
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occidentale 'Tatum's Deep Pink'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
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occidentale 'collectors nr. 2904'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
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occidentale 'collectors nr. 3704'
Rhododendron occidentale
Photo byDick Cavender
Date
Location
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Extra information:

R. occidentale was discovered by Capt. Beechy in 1827. 
Seed sent to Veitch Nursery in England by William Lobb
around 1850 from collections in California.
Hardy to about -12 F in habitat. 
Range - sea level to 5,000' or more in Southern Oregon to Southern California. 
Northern limit, about Coos Bay, Oregon. 
Southern limit, unknown but to at least the Mexican boarder east of Los Angles. 

Plants from this source soon played an important part in the deciduous hybrids of Europe.
Flowers are very variable. 
With or after the leaves, mid-April to mid-August, gradual flaring tube. 
1/2" to 4" across, white, yellow, orange pink to red, or various combinations in stripes and dots; 
usually strong yellow to orange blotch; 
margins entire to frilled or notched, occasionally petiloid, fragrant in clusters five to fifty.

Flowers in a truss will open over a period of a couple of weeks. 
Spent flowers and small immature buds can found in the same truss. 
Flowers are often asymmetrical.
Leaves usually pubescent on both sides

Parentage according the IRRC of the Royal Horticultural Society
Hybrids / cultivars where R. occidentale is directly involved:     show indirect inv.
'Albicans', 1894, Waterer, H. (Knaphill), Woking, Surrey (Knaphill), UKR. molle ssp molle x R. occidentale
'Avita', 1958, Brandt, Lester E., Tacoma, Washington, USAR. occidentale x 'Margaret Dunn Group'
'Chaffinch' (photoClick to see more information


Chaffinch
), 1941, Waterer, H. (Knaphill), Woking, Surrey (Knaphill), UK
R. occidentale x ?
'cumberlandense x occidentale', No hybridiser registered, , R. cumberlandense x R. occidentale
'Double Parfait' (photoClick to see more information


Double Parfait
), 1972, Mossman, F. D., Vancouver, Washington, USA
R. occidentale x R. occidentale 'Crescent City Double'
'Frank Mossman' (photoClick to see more information


Frank Mossman
), 1977, Mossman, F. D., Vancouver, Washington, USA
R. occidentale 'Leonard Frisbie' x R. occidentale
'Graciosum', 1901, Koster M. & Sons, Boskoop, NetherlandsR. occidentale x ?
'Jock Brydon' (photoClick to see more information


Jock Brydon
), 1968, Clausen, ,
R. molle ssp molle x R. occidentale
'John Blair' (photoClick to see more information


John Blair
), 1923, Fraser, G., Vancouver Island, BC, Canada
R. occidentale x R. arboreum ssp arboreum
'Martha Isaacson' (photo), 1958, Ostbo, E., Bellevue, Washington, USA? x R. occidentale
'occidentale x cumberlandense', No hybridiser registered, , R. occidentale x R. cumberlandense
'Rosella' (photoClick to see more information


Rosella
), 1958, Waterer, H. (Knaphill), Woking, Surrey (Knaphill), UK
R. occidentale x ?
'Samurai', 1950, Brandt, Lester E., Tacoma, Washington, USAR. occidentale x 'Fusilier'
'Sofie de Clercq', 1994, de Clercq, L., , R. cumberlandense x R. occidentale
'Toco', 1988, Hbbers, K-H., Kranenburg, GermanyR. occidentale x ?
'Tressa McMurry' (photo), 1966, McMurry, , R. occidentale x R. ponticum
'Valley Sunrise', 1983, Ticknor, R.L., , R. occidentale x 'Purple Splendour'
Hybrids where clones/selections of R. occidentale are involved (alphabetical per clone)
'Double Parfait' (photoClick to see more information


Double Parfait
), 1972, Mossman, F. D., Vancouver, Washington, USA
R. occidentale x R. occidentale 'Crescent City Double'
'Cinzia', 1993, Hachmann, Holger, , R. occidentale 'Humboldt Picotee' x 'Schneegold'
'Frank Mossman' (photoClick to see more information


Frank Mossman
), 1977, Mossman, F. D., Vancouver, Washington, USA
R. occidentale 'Leonard Frisbie' x R. occidentale
'Maggie Brown' (photoClick to see more information


Maggie Brown
), 2008, Mossman, F. D., Vancouver, Washington, USA
'Cecile' x R. occidentale 'Leonard Frisbie'
'Tamsen Donner', 1965, Frisbie, L.F., Tacoma, Washington, USAR. cumberlandense x R. occidentale 'Rogue River Bell'
'Arouca', Hbbers, K-H., Kranenburg, GermanyR. occidentale 'Stagecoach Frills' x 'Twilight Sky'


Indirect involvement of R. occidentale in cultivars: (cultivar = direct child/cultivar of occidentale)
'Oryx' (photo), 1959, Waterer, H. (Knaphill), Woking, Surrey (Knaphill), UK'cumberlandense x occidentale' x 'Kilauea'
'Lackamas Bouquet', 1965, Lancaster, Ben, F., Lackamas Gardens, Camas, Washington, USA'Graciosum' x R. luteum
'Lackamas Group', 1960, Lancaster, Ben, F., Lackamas Gardens, Camas, Washington, USA'Graciosum' x
'Sacajewa', 1934, Chisholm, J.J., , 'Graciosum' x
'Tahoma', 1958, Lancaster, Ben, F., Lackamas Gardens, Camas, Washington, USA'Graciosum' x
'Yaquina', 1958, Lancaster, Ben, F., Lackamas Gardens, Camas, Washington, USA'Graciosum' x
'Washington State Centennial' (photo), 1989, Mossman, F. D., Vancouver, Washington, USA'occidentale x cumberlandense' x 'Santiam'
'Cassley' (photo), 1993, Millais Nurseries, , R. viscosum x 'Rosella'
'Torridon' (photo), 1993, Millais Nurseries, , R. viscosum x 'Rosella'
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Rhododendron Species   Hirsutum.info     Project started 03 June 2009