Rhododendron Species


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R. macrophyllum

SubgenusHymenanthes
SectionPontica
SubsectionPonticaClick to see all Pontica
Synonyms
R. californicum   (Hook. f.
Sir Joseph Dalton Hooker
(1817-1911)
England, Suffolk
Botanical-short: Hook. f.
)
R. washingtonianum
In cultivation since: 1850

First described: 1834, (G.Don
George Don
(1798-1856)
Scotland, Forfarshire
Botanical-short: G.Don
)

Origin: W. North from California to Britisch Columbia, 0-1200 meter

Corolla: broadly campanulate
Leaves: oblong

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

Winter: evergreen
Bloomtime: unknown
Hardiness: H4
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: pink

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
: 700 cm. (23ft.)

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

To try/see this go 'Home' (top-right).
on hirstum.info: 36
R. macrophyllum per country:
(could be a clue for heat/cold-tolerance)

United States : 21
Finland : 7
Canada : 4
Netherlands : 2
France : 1
Norway : 1

Common names
California Rhododendron
California Rosebay
Pacific Rhododendron
Western Rhododendron


Natural Hybrids
Perhaps =(occidentale x macrophyllum)

Clones / selections
'Albion Ridge', 1965, Drewry, J.H., ,
'Brookings Deep Pink', unknown, ,
'Iron Mountain White #1', unknown, ,
'Seven Devils', 1987, Smith, B.M., Brittenhill Nursery, Kent, WA, USA
'Vulcan Lake White', unknown, ,


Send questions, information or pictures

Rhododendron macrophyllum
Photo bySusan Lightburn
Date08 June, 2013
LocationRhododendron Lake, Vancouver Island, BC, Canada
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Rhododendron macrophyllum
macrophyllum Whidbey cutting
Photo byHank Helm
Date17 May, 2012
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date01 June, 2009
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron macrophyllum
macrophyllum Barto White
Photo byHank Helm
Date18 May, 2006
LocationHank Helm Garden, Bainbridge Island, WA, USA
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Rhododendron macrophyllum
IJ084 RSF, planted 1993
Photo byDr. Stephan Bubert
Date29 May, 2012
LocationPrivate garden, Hamburg, Germany
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Rhododendron macrophyllum
seedling from the form collected from Whidbey Island
Photo byHank Helm
Date
LocationChimacum Woods Garden, Washington, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date12 May, 2007
LocationNorthern California, near the Oregon border
On the highway from Crescent City to Grants Pass Oregon.
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Rhododendron macrophyllum
Photo byHank Helm
Date20 May, 2007
LocationOregon, near Dunes Golf Course, just outside Bandon, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date20 May, 2007
LocationOregon, near Dunes Golf Course, just outside Bandon, USA
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Rhododendron macrophyllum
Photo bySusan Lightburn
Date04 June, 2006
LocationRhododendron Lake, Nanoose, Vancouver Island, BC, Canada
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Rhododendron macrophyllum
Photo bySusan Lightburn
Date04 June, 2006
LocationRhododendron Lake, Nanoose, Vancouver Island, BC, Canada
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Rhododendron macrophyllum
Photo byHarry R. Wright
DateJune, 2006
LocationRhododendron Lake, Vancouver Island, BC, Canada
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Rhododendron macrophyllum
Native N. American species in its natrual habitat
Photo bySusan Lightburn
Date28 May, 2006
LocationMount Elphinstone, BC, Canada
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Rhododendron macrophyllum
Photo byGarth Wedemire
Date18 June, 2008
LocationMount Elphinstone, Sunshine Coast, British Columbia, Canada
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Rhododendron macrophyllum
Photo byGarth Wedemire
Date18 June, 2008
LocationMount Elphinstone, Sunshine Coast, British Columbia, Canada
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Rhododendron macrophyllum
Photo bySusan Lightburn
Date28 May, 2006
LocationMount Elphinstone, BC, Canada
Rhododendron macrophyllum
Photo byGarth Wedemire
Date28 May, 2006
LocationSkagit River Valley, BC, Canda
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Rhododendron macrophyllum
Photo bySusan Lightburn
Date08 June, 2013
LocationRhododendron Lake, Vancouver Island, BC, Canada
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Rhododendron macrophyllum
Photo bySusan Lightburn
Date08 June, 2013
LocationRhododendron Lake, Vancouver Island, BC, Canada
See high-resolution version
Rhododendron macrophyllum
Isolated population probably does not exceed 50 plants.
Only one known population further south.
Photo byHank Helm
Date15 May, 2007
LocationNE of Santa Cruz and SW of Bag Basin
Redwood Park in California
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Rhododendron macrophyllum
Isolated population probably does not exceed 50 plants.
Only one known population further south.
Photo byHank Helm
Date15 May, 2007
LocationNE of Santa Cruz and SW of Bag Basin
Redwood Park in California
See high-resolution version
Rhododendron macrophyllum
Isolated population probably does not exceed 50 plants.
Only one known population further south.
Photo byHank Helm
Date15 May, 2007
LocationNE of Santa Cruz and SW of Bag Basin
Redwood Park in California
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Rhododendron macrophyllum
Photo byGarth Wedemire
Date12 July, 2005
LocationRhododendron Wayside in Manning Park
at the Skagit River, British Columbia, Canada
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Rhododendron macrophyllum
Photo byGarth Wedemire
Date28 May, 2006
LocationSkagit River Valley, BC, Canda
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Rhododendron macrophyllum
Photo byGarth Wedemire
Date12 July, 2005
LocationRhododendron Wayside in Manning Park
at the Skagit River, British Columbia, Canada
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Rhododendron macrophyllum
Photo byHank Helm
Date
Locationin the wild, Camp Union, Washington State, USA
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Rhododendron macrophyllum
macrophyllum Neletta
Photo byHank Helm
Date
Locationin the wild, Washington State, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date21 May, 2007
Locationin the wild, Washington State, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date
Locationin the wild, Washington State, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date
Locationin the wild, Washington State, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date27 May, 2006
Locationin the wild, Washington State, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date
Locationin the wild, Washington State, USA
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Rhododendron macrophyllum
Photo byHank Helm
Date27 May, 2006
Locationin the wild, Washington State, USA
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Rhododendron macrophyllum
The red (new) foliage probably caused by the Serpentine soil
Photo byDick Cavender
Date
LocationSW Oregon a few miles from the coast and from the California boarde
Rhododendron macrophyllum
R. macrophyllum with a witches broom
Photo byDick Cavender
Date
LocationSW Oregon a few miles from the coast and from the California boarde
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Rhododendron macrophyllum
Photo byHerman Van Ree
Date21 August, 2009
LocationUBC Botanical Gardens, Vancouver
Rhododendron macrophyllum
Photo byHerman Van Ree
Date21 August, 2009
LocationUBC Botanical Gardens, Vancouver
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macrophyllum 'Albion Ridge'
Rhododendron macrophyllum
Photo byDennis McKiver
Date12 May, 2012
LocationMendocino Coast Botanical Garden, Fort Bragg, CA, USA
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macrophyllum 'Albion Ridge'
Rhododendron macrophyllum
Photo byDennis McKiver
Date14 May, 2011
LocationMendocino Coast Botanical Garden, Fort Bragg, CA, USA
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macrophyllum 'Seven Devils'
Rhododendron macrophyllum
Photo byHank Helm
Date
LocationHank Helm Garden, Bainbridge Island, WA, USA
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macrophyllum 'Seven Devils'
Rhododendron macrophyllum
Photo byPaul & Linda Lawry
Date
Locationprivate garden Lantzville, Vancouver Island, BC, Canada
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macrophyllum 'Vulcan Lake White'
Rhododendron macrophyllum
Photo byDick Cavender
Date
LocationRed's Rhodies, Sherwood Oregon USA
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macrophyllum 'Iron Mountain White #1'
Rhododendron macrophyllum
Photo byDick Cavender
Date
LocationRed's Rhodies, Sherwood Oregon USA

Parentage according the IRRC of the Royal Horticultural Society
Hybrids / cultivars where R. macrophyllum is directly involved:     show indirect inv.
'arboreum x macrophyllum', No hybridiser registered, , R. arboreum ssp arboreum x R. macrophyllum
'Grandma Barbara', 1972, unknown, , R. macrophyllum x ?
'Jackie Ann' (photoClick to see more information


Jackie Ann
), 1983, Greer Gardens, ,
R. macrophyllum x ?
'Walluski Chief', 1955, Baker, G.L., Astoria, Oregon, USAR. macrophyllum x R. griersonianum
Hybrids where clones/selections of R. macrophyllum are involved (alphabetical per clone)
'Sparkling Burgundy', unknown, , 'Purple Splendour' x R. macrophyllum 'Seven Devils'


Indirect involvement of R. macrophyllum in cultivars: (cultivar = direct child/cultivar of macrophyllum)
'Mrs Jamie Fraser' (photoClick to see more information


Mrs Jamie Fraser
), 1930, Fraser, G., Vancouver Island, BC, Canada
'arboreum x macrophyllum' x R. arboreum ssp arboreum
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Rhododendron Species   Hirsutum.info     Project started 03 June 2009