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Rhododendron occidentale (Torr. & A. Gray) A. Gray
WESTERN AZALEA
Life   Plantae   Dicotyledoneae   Ericaceae   Rhododendron


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Associates · map
FamilyScientific name @ source (records)
Apidae  Bombus californicus @ EMEC (2); UCRC_ENT (2)

Bombus melanopygus @ UCRC_ENT (5); EMEC (2)

Bombus mixtus @ UCRC_ENT (1)

Bombus vosnesenskii @ EMEC_JPS__JPS (5)
Coleosporiaceae  Chrysomyxa ledi @ BPI (2)
Dermateaceae  Pezicula cenangium @ 656955B (1); 656955A (1)

Pezicula @ BPI (2)
Erysiphaceae  Microsphaera alni @ BPI (1)

Microsphaera vaccinii @ BPI (1)
Exobasidiaceae  Exobasidium burtii @ BPI (4)

Exobasidium decolorans @ BPI (8)
Miridae  Dichrooscytus lagopinus @ AMNH_PBI (1)

Tupiocoris similis @ AMNH_ENT (2)
Mycosphaerellaceae  Septoria solitaris @ BPI (6)
Polyporaceae  Polyporus versicolor @ BPI (1)
Stictidaceae  Stictis radiata @ BPI (1)

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Following modified from Virginia Tech Dendrology
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Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=RHOC ---> https://plants.usda.gov/java/profile?symbol=RHOC
https://plants.usda.gov/java/profile?symbol=RHOC ---> http://plants.usda.gov/core/profile?symbol=RHOC
http://plants.usda.gov/core/profile?symbol=RHOC ---> https://plants.usda.gov/core/profile?symbol=RHOC
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Rhododendron occidentale (Torr. & A. Gray) A. Gray
western azalea

Image of Rhododendron occidentale

General Information
Symbol: RHOC
Group: Dicot
Family: Ericaceae
Duration: Perennial
Growth Habit : Shrub
Native Status : L48   N
Characteristics
Data Source and Documentation
About our new maps
Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   

Images

click on a thumbnail to view an image, or see all the Rhododendron thumbnails at the Plants Gallery

Brother Alfred Brousseau. Provided by St. Mary's College of California . ©St. Mary's College of California. Usage Requirements .

Brother Alfred Brousseau. Provided by St. Mary's College of California . ©St. Mary's College of California. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, CA, San Francisco, Golden Gate Park, Strybing Arboretum. October 1, 2002. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, CA, San Francisco, Golden Gate Park, Strybing Arboretum. October 1, 2002. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, CA, Berkeley, Regional Parks Botanic Garden at Tilden. June 5, 2003. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, CA, Berkeley, Regional Parks Botanic Garden at Tilden. June 5, 2003. Usage Requirements .

Margaret Williams. Provided by Nevada Native Plant Society . ©Nevada Native Plant Society. Usage Requirements .

Margaret Williams. Provided by Nevada Native Plant Society . ©Nevada Native Plant Society. Usage Requirements .

©Gary A. Monroe. United States, CA, Placer Co. 1984. Usage Requirements .

©Gary A. Monroe. United States, CA, Del Norte Co. July 10, 2005. Usage Requirements .

©Gary A. Monroe. United States, CA, Del Norte Co. July 10, 2005. Usage Requirements .

slideshow

Synonyms

Classification

Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Dilleniidae
Order Ericales
Family Ericaceae – Heath family
Genus Rhododendron L. – rhododendron
Species Rhododendron occidentale (Torr. & A. Gray) A. Gray – western azalea

Subordinate Taxa

The Plants Database includes the following 3 subspecies of Rhododendron occidentale . Click below on a thumbnail map or name for subspecies profiles. Plant is native (blue) Native Plant is introduced Introduced Plant is introduced Native and Introduced Related taxa legend Distribution of <i>
Rhododendron occidentale</i>
(Torr. & A. Gray) A. Gray var. <i>
occidentale </i>
Rhododendron occidentale var. occidentale
western azalea Distribution of <i>
Rhododendron occidentale</i>
(Torr. & A. Gray) A. Gray var. <i>
paludosum</i>
Jeps.
Rhododendron occidentale var. paludosum
western azalea Distribution of <i>
Rhododendron occidentale</i>
(Torr. & A. Gray) A. Gray var. <i>
sonomense</i>
(Greene) Rehder
Rhododendron occidentale var. sonomense
Sonoma azalea

Legal Status

Wetland Status

Interpreting Wetland Status

North America
Arid West FAC
Western Mountains, Valleys, and Coast FAC

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (RHOC)
CalPhotos (RHOC)
Integrated Taxonomic Information System (RHOC)
Jepson Interchange (University of California - Berkeley) (RHOC)
Lady Bird Johnson Wildflower Center Native Plant Information Network (RHOC)
Native American Ethnobotany (University of Michigan - Dearborn) (RHOC)

Wildlife

Food

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Cover

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover


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Following modified from Flora of North America
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Link to Flora of North America home
 
All Floras       Advanced Search
FNA Vol. 8 Page 458, 467 , 468 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 8 | Ericaceae | Rhododendron

16. Rhododendron occidentale (Torrey & A. Gray) A. Gray in W. H. Brewer et al., Bot. California. 1: 458. 1876.

Western azalea

Azalea occidentalis Torrey & A. Gray in War Department [U.S.], Pacif. Railr. Rep. 4(5): 116. 1857; A. californica Torrey & A. Gray ex Durand; Rhododendron occidentale var. paludosum Jepson; R. sonomense Greene

Shrubs or trees , to 8(-10) m, usually not rhizomatous. Stems: bark smooth to vertically furrowed, shredding; twigs sparsely to densely multicellular stipitate-glandular-hairy or unicellular-hairy, or glabrous, sometimes only unicellular-hairy. Leaves deciduous; petiole multicellular eglandular- or stipitate-glandular-hairy and unicellular-hairy; blade ovate or obovate to elliptic, (2.5-)3.5-8.2 (-10.8) × 1.2-2.9(-3.6) cm, thin, membranous, margins entire, plane, ciliate, eglandular-hairy, sometimes also stipitate-glandular-hairy, apex acute to obtuse, often mucronate, abaxial surface glabrous or sparsely unicellular-hairy, often also stipitate-glandular-hairy (or, rarely, stipitate-glandular- and eglandular-hairy), adaxial surface sparsely scattered, multicellular eglandular- and/or stipitate-glandular-hairy and unicellular-hairy, or glabrous. Floral bud scales sparsely to densely unicellular-hairy abaxially, rarely also sparsely eglandular- or stipitate-glandular-hairy, margins unicellular-ciliate, or with glands and cilia mixed, or glandular. Inflorescences 3-15-flowered; bracts similar to bud scales. Pedicels 9-26 mm, stipitate-glandular- and, sometimes, also eglandular-hairy. Flowers opening with leaves or after they have expanded, erect to horizontal, fragrant or mephitic-scented; calyx lobes 1-4(-9) mm, often stipitate-glandular- and/or eglandular-hairy, sometimes also unicellular-hairy, margins usually stipitate-glandular-hairy; corolla white with contrasting yellow blotch on upper lobe, white and pink or salmon, or pink with orange blotch on upper lobe, rarely white with yellow lines at throat, or with tube white to red, funnelform, 30-58 mm, stipitate-glandular-hairy and, rarely, also eglandular-hairy, otherwise sparsely to moderately unicellular-hairy or these hairs absent on outer surface, petals connate, lobes 13-29 mm, tube gradually expanding into lobes, 15-29 mm (equaling or longer than lobes); stamens 5, much exserted, ± unequal, 40-75 mm. Capsules borne on erect pedicels, 12-22 × 4-14 mm, multicellular stipitate-glandular-hairy, sometimes also eglandular-hairy, otherwise sparsely unicellular-hairy (unicellular hairs rarely absent). Seeds without distinct tails, flattened portion of testa well developed at each end; testa expanded, dorsiventrally flattened, ± loose. 2 n = 26.

Flowering spring-summer. Moist, wooded slopes and canyon bottoms, along streams, thickets, bogs, serpentine ridges, ocean bluffs; 0-2700 m; Calif., Oreg.

The flowers of Rhododendron occidentale show an exceptional range of variation in color.

Following modified from CalPhotos
   Top | See original

http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Rhododendron+occidentale+var.+occidentale&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Rhododendron+occidentale+var.+occidentale&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

CalPhotos    
Contributors       Log In  
 

Number of matches : 2
Query: SELECT * FROM img WHERE ready=1 and taxon like "Rhododendron occidentale var. occidentale%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Rhododendron occidentale var. occidentale
Rhododendron occidentale var. occidentale
Western Azalea
ID: 0000 0000 0412 0773 [detail]
© 2012 Gary A. Monroe

Rhododendron occidentale var. occidentale
Rhododendron occidentale var. occidentale
Western Azalea
ID: 0000 0000 0412 0774 [detail]
© 2012 Gary A. Monroe

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


Copyright © 1995-2018 UC Regents. All rights reserved.

CalPhotos is a project of BNHM      University of California, Berkeley

Following modified from CalPhotos
   Top | See original

http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Rhododendron+occidentale&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Rhododendron+occidentale&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

CalPhotos    
Contributors       Log In  
 

Number of matches : 173
Query: SELECT * FROM img WHERE ready=1 and taxon like "Rhododendron occidentale%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8076 3101 0667 0107 [detail]
Charles Webber
© 1998 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8253 3202 3491 0027 [detail]
Charles Thoreau Townsend
© 1999 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8120 3181 4564 0144 [detail]
Charles Webber
© 1998 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Azalea
ID: 9187 3302 4015 0123 [detail]
Jo-Ann Ordano
© 2000 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8076 3101 0667 0108 [detail]
Charles Webber
© 1998 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8253 3202 4148 0082 [detail]
Sherry Ballard
© 1999 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8076 3101 0669 0094 [detail]
Charles Webber
© 1998 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 6246 3041 2844 0094 [detail]
© 1995 Saint Mary's College of California

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8266 3261 1073 0022 [detail]
William R. Hewlett
© 1999 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 6246 3041 2920 0007 [detail]
© 1995 Saint Mary's College of California

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 9092 3191 3548 0024 [detail]
Gerald and Buff Corsi
© 1999 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 0000 0000 1202 1034 [detail]
© 1984 Gary A. Monroe

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 0024 3291 1999 0050 [detail]
Frithjof Holmboe
© 2000 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 6246 3041 2920 0009 [detail]
© 1995 Saint Mary's College of California

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 6246 3041 2844 0093 [detail]
© 1995 Saint Mary's College of California

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8076 3101 0669 0098 [detail]
Charles Webber
© 1998 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8076 3101 0666 0068 [detail]
Charles Webber
© 1998 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 6246 3041 2844 0098 [detail]
© 1995 Saint Mary's College of California

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 8253 3202 3491 0032 [detail]
Charles Webber
© 1999 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 6246 3041 2844 0097 [detail]
© 1995 Saint Mary's College of California

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 6246 3041 2920 0008 [detail]
© 1995 Saint Mary's College of California

Rhododendron occidentale
Rhododendron occidentale
Azalea
ID: 9187 3302 4015 0122 [detail]
Jo-Ann Ordano
© 2000 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Azalea
ID: 9187 3302 4015 0092 [detail]
Jo-Ann Ordano
© 2000 California Academy of Sciences

Rhododendron occidentale
Rhododendron occidentale
Western Azalea
ID: 9092 3191 3542 0113 [detail]
Steven Kaune
© 1999 California Academy of Sciences

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


Copyright © 1995-2018 UC Regents. All rights reserved.

CalPhotos is a project of BNHM      University of California, Berkeley

Updated: 2018-07-19 23:52:25 gmt
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