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

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 @ 444768A (1); 444768B (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 @ 1108345A (1); 1108345B (1); BPI (37)

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); BPI (5); 374578A (1)

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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Following modified from Plants Database, United States Department of Agriculture
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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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Updated: 2017-12-11 04:20:28 gmt
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