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Rhododendron maximum L.
GREAT LAUREL
Great Rhododendron

Life   Plantae   Dicotyledoneae   Ericaceae   Rhododendron

Rhododendron maximum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron maximum

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Rhododendron maximum
© Copyright Bobby Hattaway 2011 · 4
Rhododendron maximum
Rhododendron maximum, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, inflorescence - whole - unspecified

Rhododendron maximum, inflorescence - frontal view of flower
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, inflorescence - frontal view of flower
Rhododendron maximum, inflorescence - lateral view of flower
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, inflorescence - lateral view of flower

Rhododendron maximum, leaf - whole upper surface
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, leaf - whole upper surface
Rhododendron maximum, twig - orientation of petioles
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, twig - orientation of petioles

Rhododendron maximum, bark - of a medium tree or large branch
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, bark - of a medium tree or large branch
Rhododendron maximum, whole tree or vine - general
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, whole tree or vine - general

Rhododendron maximum, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, inflorescence - whole - unspecified
Rhododendron maximum, whole tree or vine - general
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, whole tree or vine - general

Rhododendron maximum, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, inflorescence - whole - unspecified
Rhododendron maximum, inflorescence - frontal view of flower
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, inflorescence - frontal view of flower

Rhododendron maximum, inflorescence - close-up of flower interior
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, inflorescence - close-up of flower interior
Rhododendron maximum, inflorescence - ventral view of flower + perianth
© Copyright Steve Baskauf, 2002-2011 · 4
Rhododendron maximum, inflorescence - ventral view of flower + perianth

Associates · map
FamilyScientific name @ source (records)
Agaricaceae  Phoma petiolorum @ BPI (1)
Amphisphaeriaceae  Discosia artocreas @ BPI (1)

Pestalotia guepinii @ BPI (10)

Pestalotia macrotricha @ BPI (15)

Pestalotia mariae-wilsoni @ BPI (1)

Pestalotia rhododendri @ BPI (1)

Pestalotia sydowiana @ BPI (3)

Pestalotia @ 862447B (1); BPI (1)

Pestalotiopsis guepinii @ BPI (1)
Andrenidae  Andrena cornelli @ BBSL (3)
Aphididae  Illinoia ( @ NCSU_ENT (8)
Ascobolaceae  Ascobolus rhododendri @ BPI (5)
Asterinidae  Asterina exasperans @ BPI (1)
Botryosphaeriaceae  Guignardia rhodorae @ BPI (2)

Microdiplodia @ BPI (1)

Phyllosticta maxima @ BPI (4)

Phyllosticta saccardoi @ BPI (3)

Phyllosticta @ BPI (1)

Sphaeropsis rhododendri @ BPI (1)
Dacrymycetaceae  Calocera cornea @ BPI (1)
Dermateaceae  Dermea lobata @ BPI (6)

Gloeosporium @ BPI (1)

Mollisia cinerea @ BPI (2)

Mollisia tyrolensis @ BPI (1)

Pezicula rhododendricola @ BPI (1)

Tapesia subiculata @ BPI (1)
Diatrypaceae  Libertella @ BPI (1)
Didymosphaeriaceae  Didymosphaeria @ BPI (2)
Erysiphaceae  Oospora rhododendri @ BPI (1)
Exobasidiaceae  Exobasidium rhododendri @ BPI (1)

Exobasidium vaccinii @ BPI (5)
Gnomoniaceae  Discula rhododendri @ 862447A (1)

Laestadia rhodorae @ BPI (8)
Halictidae  Lasioglossum callidum @ AMNH_BEE (1)

Lasioglossum coreopsis @ AMNH_BEE (8)

Lasioglossum cressonii @ BBSL__BBSLID (1)

Lasioglossum imitatum @ AMNH_BEE (1)

Lasioglossum nigroviride @ BBSL (1)
Helicinidae  Hendersonia concentrica @ BPI (1)
Helotiaceae  Pestalopezia rhododendri @ BPI (6)

Pezizella rhododendri @ BPI (2)

Sporonema oxycocci @ BPI (1)
Hyaloscyphaceae  Arachnopeziza aurata @ BPI (1)
Hymenochaetaceae  Hymenochaete agglutinans @ BPI (1)

Hymenochaete corticolor @ BPI (1)

Hymenochaete fuliginosa @ BPI (1)

Hymenochaete tabacina @ BPI (1)
Hypocreaceae  Hypocrea gelatinosa @ BPI (1)

Hypocrea virginiensis @ BPI (2)

Hypocreopsis rhododendri @ BPI (2)
Hyponectriaceae  Physalospora rhododendri @ BPI (6)

Physalospora viscosa @ BPI (2)
Hysteriaceae  Hysterographium gerardii @ BPI (2)

Hysterographium @ BPI (1)
Lasiosphaeriaceae  Lasiosphaeria ovina @ BPI (1)
Marasmiaceae  Marasmius @ BPI (1)
Melanconidaceae  Coryneum triseptatum @ BPI (1)
Meliolaceae  Meliola niessliana @ BPI (1)
Microascaceae  Stysanus @ BPI (3)
Miridae  Rhinocapsus rubricans @ AMNH_PBI (4)

Rhinocapsus vanduzeei @ AMNH_PBI (3)

Tupiocoris rhododendri @ NCSU (6); AMNH_ENT (28)
Mycosphaerellaceae  Mycosphaerella clintoniana @ BPI (1)

Mycosphaerella colorata @ BPI (2)

Mycosphaerella oblivia @ BPI (2)

Septoria rhododendri @ BPI (2)
Parmulariaceae  Cycloschizon @ BPI (2)
Peniophoraceae  Peniophora @ BPI (1)
Phaeosphaeriaceae  Leptosphaeria @ BPI (3)
Pleosporaceae  Stemphylium @ 444768B (1); 444768A (1)
Polyporaceae  Panus stipticus @ BPI (1)

Polyporus caesius @ BPI (1)

Polyporus pargamenus @ BPI (1)

Polyporus versicolor @ BPI (1)

Poria versipora @ BPI (1)
Rhytismataceae  Coccomyces radiatus @ BPI (1)

Lophodermium rhododendri @ BPI (37); 1108345B (1); 1108345A (1)

Lophodermium schweinitzii @ BPI (17)

Propolis faginea @ BPI (2)
Stereaceae  Stereum triste @ BPI (4)
Tingidae  Stephanitis pyrioides @ NCSU (2)
Tremellaceae  Tremella frondosa @ BPI (2)
Tricholomataceae  Helotium castaneum @ BPI (2)
Venturiaceae  Venturia rhododendri @ BPI (1)
Xylariaceae  Hypoxylon colliculosum @ BPI (1)

Hypoxylon serpens @ BPI (3)
_  Anthina pallida @ BPI (1)

Briosia azaleae @ BPI (2)

Cryptostictis mariae @ 374578B (1); 374578A (1); BPI (5)

Grandinia crustosa @ BPI (2)

Monochaetia monochaeta @ BPI (5)

Phomatospora gelatinospora @ BPI (1)

Sporidesmium peziza @ BPI (1)

Sporocybe azaleae @ BPI (11)

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Following modified from Virginia Tech Dendrology
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&pull 20q v5.145 20180528: Error 500 Can't connect to www.cnr.vt.edu:80 http://www.cnr.vt.edu/dendro/dendrology/syllabus/rmaximum.htm

Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=RHMA4 ---> https://plants.usda.gov/java/profile?symbol=RHMA4
https://plants.usda.gov/java/profile?symbol=RHMA4 ---> http://plants.usda.gov/core/profile?symbol=RHMA4
http://plants.usda.gov/core/profile?symbol=RHMA4 ---> https://plants.usda.gov/core/profile?symbol=RHMA4
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You are here: Home / Plant Profile

Rhododendron maximum L.
great laurel

Image of Rhododendron maximum

General Information
Symbol: RHMA4
Group: Dicot
Family: Ericaceae
Duration: Perennial
Growth Habit : Shrub
Tree
Native Status : CAN   N
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

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, DC, Washington, USDA ARS National Arboretum. June 27, 2003. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, DC, Washington, USDA ARS National Arboretum. June 27, 2003. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, DC, Washington, USDA ARS National Arboretum. June 27, 2003. Usage Requirements .

Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory . United States, TN, Gage. Usage Requirements .

©Ted Bodner. James H. Miller and Karl V. Miller. 2005. Forest plants of the southeast and their wildlife uses. University of Georgia Press., Athens. Provided by University of Georgia Press . Scanned by Forestry Images . Usage Requirements .

©Richard A. Howard. Provided by Smithsonian Institution, Richard A. Howard Photograph Collection . United States, MA, Medfield. Usage Requirements .

A.F. Hough. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, PA, Allegheny National Forest. 1935. Usage Requirements .

E.S. Shipp. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, NC, Pisgah National Forest. 1929. Usage Requirements .

Provided by National Agricultural Library . Originally from USDA Forest Service . United States, NC. 1925. Usage Requirements .

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 681. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .

Suzanne Foster. Provided by USDA Forest Service . Usage Requirements .

slideshow

Synonyms

Symbol Scientific Name
RHAS2 Rhododendron ashleyi Coker

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 maximum L. – great laurel

Subordinate Taxa

This plant has no children

Legal Status

Threatened and Endangered Information:
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete protected plant list for that location.
Maine great rhododendron Threatened
Massachusetts great laurel Threatened
New York great laurel Exploitably Vulnerable
Ohio great rhododendron Threatened
Vermont great laurel Threatened

Wetland Status

Interpreting Wetland Status

North America
Atlantic and Gulf Coastal Plain FAC
Eastern Mountains and Piedmont FAC
Midwest FAC
Northcentral & Northeast FAC

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (RHMA4)
CalPhotos (RHMA4)
Integrated Taxonomic Information System (RHAS2)
Integrated Taxonomic Information System (RHMA4)
Lady Bird Johnson Wildflower Center Native Plant Information Network (RHMA4)
Native American Ethnobotany (University of Michigan - Dearborn) (RHMA4)
Native Plants Network (RHMA4)
USDA Forest Service Fire Effects Information System (RHMA4)
University of Tennessee Herbarium (Distribution) (RHMA4)

Wildlife

Food

Source Large Mammals Small Mammals Water Birds Terrestrial Birds
Miller Low Minor

Cover

Source Large Mammals Small Mammals Water Birds Terrestrial Birds
Miller Moderate Moderate

Sources

Miller, J.H., and K.V. Miller. 1999. Forest plants of the southeast and their wildlife uses . Southern Weed Science Society.

Description of Values

Value Class Food Cover
High Average 25-50% of diet Regular source of cover
Low 5-10% of diet Infrequently used as cover
Minor 2-5% of diet Sparsely used as cover
Moderate Average 10-25% of diet Occasional source of cover


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Following modified from Flora of North America
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Link to Flora of North America home
 
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FNA Vol. 8 Page 456, 461 , 462, 463 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 8 | Ericaceae | Rhododendron

7. Rhododendron maximum Linnaeus, Sp. Pl. 1: 392. 1753.

Rosebay, great laurel

Rhododendron ashleyi Coker

Shrubs or trees , to 10 m, sometimes rhizomatous. Stems: bark smooth to vertically furrowed, shredding; twigs multicellular stipitate-glandular-hairy and eglandular-hairy (hairs basally branched, crisped/matted), glabrate in age. Leaves persistent; petiole multicellular-hairy (hairs ± branched), often glabrescent; blade oblong to obovate or elliptic, (6-)9-20(-31) × (1.5-)2-5(-8) cm (length/width ratio 2.4-8), thick, coriaceous, margins entire, revolute to ± plane, glabrous or sparsely hairy (hairs branched), apex acuminate to sometimes acute, surfaces scattered stipitate-glandular-hairy and eglandular-hairy (hairs forming dense mat, basally branched, crisped, abaxially becoming sticky and matted, forming ± scaly or continuous, pale, shellaclike coating, smooth to slightly roughened, hairs ± deciduous adaxially). Floral bud scales stipitate-glandular-hairy, eglandular-hairy (hairs ferruginous, crisped), and short unicellular-hairy abaxially, margins hairy (hairs branched, long-celled). Inflorescences 10-25-flowered; bracts similar to bud scales. Pedicels 17-60 mm, multicellular stipitate-glandular-hairy. Flowers opening after development of leaves (of flowering shoots), erect to horizontal, not or only slightly fragrant; calyx lobes 2-6 mm, stipitate-glandular-hairy; corolla white to pink, rarely deep pink to purple, with yellowish green spots on upper lobe, campanulate, 20-36 mm, scattered stipitate-glandular-hairy on outer surface, petals connate, lobes 10-23 mm, tube gradually expanding into lobes, 7-16 mm; stamens 10, included, ± unequal, 14-26 mm; (ovary stipitate-glandular-hairy). Capsules borne on erect pedicels, 8-20 × 4-6.5 mm, stipitate-glandular-hairy. Seeds without distinct tails, flattened portion of testa well developed at each end; testa expanded, dorsiventrally flattened, loose. 2 n = 26.

Flowering summer. Stream banks, mesic woods; 0-1900 m; Ala., Conn., Ga., Ky., Maine, Md., Mass., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va.

Individuals of Rhododendron maximum are beautiful, cold-hardy shrubs and are frequently cultivated as ornamentals. Hybrids with R. catawbiense occur. This species has been attributed in standard floras to eastern Canada but not confirmed there by specimens.

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Rhododendron+maximum&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+maximum&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

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Number of matches : 41
Query: SELECT * FROM img WHERE ready=1 and taxon like "Rhododendron maximum%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Rhododendron maximum
Rhododendron maximum
Great Laurel
ID: 8253 3202 4144 0142 [detail]
Dr. G Dallas and Margaret Hanna
© 1999 California Academy of Sciences

Rhododendron maximum
Rhododendron maximum
Great Laurel
ID: 9187 3302 4606 0135 [detail]
Frithjof Holmboe
© 2001 California Academy of Sciences

Rhododendron maximum
Rhododendron maximum
Rosebay Rhododendron
ID: 0000 0000 0705 0086 [detail]
© 2005 George Rembert

Rhododendron maximum
Rhododendron maximum
Rosebay Rhododendron
ID: 0000 0000 0705 0087 [detail]
© 2005 George Rembert

Rhododendron maximum
Rhododendron maximum
Rosebay Rhododendron
ID: 0000 0000 0705 0088 [detail]
© 2005 George Rembert

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3694 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3695 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3696 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3697 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3698 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3699 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3700 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3701 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3702 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3703 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3704 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3705 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3706 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3707 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3708 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3709 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3710 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3711 [detail]
© 2016 Keir Morse

Rhododendron maximum
Rhododendron maximum
Great Laurel, Rosebay
ID: 0000 1111 1234 3712 [detail]
© 2016 Keir Morse

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 .   


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