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Rhododendron viscosum (L.) Torr.
SWAMP AZALEA
Life   Plantae   Dicotyledoneae   Ericaceae   Rhododendron

Rhododendron viscosum, Swamp Azalea
© Copyright Sheryl Pollock 2011 · 9
Rhododendron viscosum, Swamp Azalea

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Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum
Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum

Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum
Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum

Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum
Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum

Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum
Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum

Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum
Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum

Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum
Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum

Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum
Rhododendron viscosum
© Copyright Bobby Hattaway 2011 · 5
Rhododendron viscosum

Associates · map
FamilyScientific name @ source (records)
Amphisphaeriaceae  Pestalotia guepinii @ BPI (1)
Andrenidae  Andrena cornelli @ AMNH_BEE (4)
Apidae  Anthophora abrupta @ AMNH_BEE (1)

Bombus bimaculatus @ AMNH_BEE (1)
Exobasidiaceae  Exobasidium vaccinii @ BPI (19)
Halictidae  Lasioglossum oblongum @ CUIC_ENT (2)
Miridae  Rhinocapsus rubricans @ AMNH_PBI (6)

Rhinocapsus vanduzeei @ AMNH_PBI (3)
Pucciniastraceae  Pucciniastrum myrtilli @ BPI (1)

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Rhododendron viscosum (L.) Torr. Swamp Azalea
Ericaceae — Heath family
Native
Rhododendron viscosum
Sussex County
June 2001

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Photos copyright David G. Smith

Delaware Wildflowers main page

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http://plants.usda.gov/java/profile?symbol=RHVI2 ---> https://plants.usda.gov/java/profile?symbol=RHVI2
https://plants.usda.gov/java/profile?symbol=RHVI2 ---> http://plants.usda.gov/core/profile?symbol=RHVI2
http://plants.usda.gov/core/profile?symbol=RHVI2 ---> https://plants.usda.gov/core/profile?symbol=RHVI2
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Rhododendron viscosum (L.) Torr.
swamp azalea

Image of Rhododendron viscosum

General Information
Symbol: RHVI2
Group: Dicot
Family: Ericaceae
Duration: Perennial
Growth Habit : Shrub
Native Status : L48   N
Characteristics
Data Source and Documentation
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Plants-NRCS Logos
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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

Robert H. Mohlenbrock. USDA SCS. 1991. Southern wetland flora: Field office guide to plant species . South National Technical Center, Fort Worth. Provided by USDA NRCS Wetland Science Institute (WSI). Usage Requirements .

George Pyne. USDA SCS. 1991. Southern wetland flora: Field office guide to plant species . South National Technical Center, Fort Worth. Provided by USDA NRCS Wetland Science Institute (WSI). Usage Requirements .

©Jim Stasz. 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 .

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: 679. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .

USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service. Provided by NRCS National Wetland Team . Usage Requirements .

slideshow

Synonyms

Symbol Scientific Name
AZSE Azalea serrulata Small
AZVI Azalea viscosa L.
RHCO5 Rhododendron coryi Shinners
RHSE Rhododendron serrulatum (Small) Millais
RHVIA Rhododendron viscosum (L.) Torr. var. aemulans Rehder
RHVIG Rhododendron viscosum (L.) Torr. var. glaucum (Michx.) A. Gray
RHVIM Rhododendron viscosum (L.) Torr. var. montanum Rehder
RHVIN Rhododendron viscosum (L.) Torr. var. nitidum (Pursh) A. Gray
RHVIS Rhododendron viscosum (L.) Torr. var. serrulatum (Small) H.E. Ahles
RHVIT Rhododendron viscosum (L.) Torr. var. tomentosum Rehder

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 viscosum (L.) Torr. – swamp azalea

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 clammy azalea Endangered
New Hampshire swamp azalea Threatened
New York swamp azalea Exploitably Vulnerable

Wetland Status

Interpreting Wetland Status

North America
Atlantic and Gulf Coastal Plain OBL
Eastern Mountains and Piedmont FACW
Great Plains FACW
Midwest OBL
Northcentral & Northeast FACW

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (RHVI2)
CalPhotos (RHVI2)
Integrated Taxonomic Information System (AZSE)
Integrated Taxonomic Information System (AZVI)
Integrated Taxonomic Information System (RHCO5)
Integrated Taxonomic Information System (RHSE)
Integrated Taxonomic Information System (RHVI2)
Integrated Taxonomic Information System (RHVIA)
Integrated Taxonomic Information System (RHVIG)
Integrated Taxonomic Information System (RHVIM)
Integrated Taxonomic Information System (RHVIN)
Integrated Taxonomic Information System (RHVIS)
Integrated Taxonomic Information System (RHVIT)
Lady Bird Johnson Wildflower Center Native Plant Information Network (RHVI2)
USF Atlas of Florida Vascular Plants (RHVI2)
University of Tennessee Herbarium (Distribution) (RHVI2)

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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FNA Vol. 8 Page 458, 468, 471 , 472 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 8 | Ericaceae | Rhododendron

24. Rhododendron viscosum (Linnaeus) Torrey, Fl. N. Middle United States. 424. 1824.

Swamp or clammy azalea

Azalea viscosa Linnaeus, Sp. Pl. 1: 151. 1753; A. oblongifolia Small; A. serrulata Small; Rhododendron coryi Shinners; R. oblongifolium (Small) Millais; R. serrulatum (Small) Millais; R. viscosum var. serrulatum (Small) H. E. Ahles

Shrubs or trees , to 7 m, rhizomatous or not. Stems: bark smooth to vertically furrowed, shredding; twigs sparsely to conspicuously multicellular eglandular-hairy (hairs unbranched), otherwise glabrous or densely unicellular-hairy. Leaves deciduous; petiole usually multicellular eglandular-hairy and unicellular-hairy; blade ovate to obovate, 2-7(-9) × 1-3(-3.8) cm, ± thin, membranous to chartaceous, margins entire or, sometimes, minutely serrulate, plane, ciliate, eglandular-hairy, apex acute to obtuse, often mucronate, abaxial surface glabrous or densely unicellular-hairy, adaxial surface (lustrous or dull), glabrous or sparsely scattered eglandular-hairy, sometimes also sparsely unicellular-hairy. Floral bud scales glabrous or densely unicellular-hairy abaxially (sometimes with sharply marked, dark brown band along distal margins), margins unicellular-ciliate or, sometimes, glandular-serrulate. Inflorescences 3-14-flowered; bracts similar to bud scales. Pedicels 5-27 mm, stipitate-glandular- or, sometimes, eglandular-hairy, otherwise sparsely to densely unicellular-hairy. Flowers opening after leaves, erect to horizontal, slightly to strongly fragrant (most noticeable at night); calyx lobes 0.5-5 mm, surfaces and margins scattered stipitate-glandular-hairy or, sometimes, eglandular-hairy, often also unicellular-hairy; corolla white, sometimes pink-tinged or pink (not strongly contrasting with white or greenish to pinkish style or filaments), without blotch on upper lobe, funnelform, 20-58 mm, usually scattered, often conspicuously stipitate-glandular-hairy (hairs continuing in lines up lobes), otherwise sparsely to moderately unicellular-hairy on outer surface, petals connate, lobes 7-21 mm, tube usually ± gradually expanded into lobes, 13-37 mm (equaling or much longer than lobes); stamens 5, much exserted, ± unequal, 21-65 mm. Capsules borne on erect pedicels, 7-20 × 3-7 mm, usually densely stipitate-glandular- and/or eglandular-hairy, otherwise densely unicellular-hairy to ± glabrous. Seeds without distinct tails, flattened portion of testa well developed at each end; testa expanded, dorsiventrally flattened, ± loose. 2 n = 26.

Flowering spring-summer. Acid swamps, bogs, seepage slopes, pocosins, streamheads and baygalls, wet pine flatwoods, moist pine or pine/oak forests, hummocks, shrub balds; 0-1500 m; Ala., Ark., Conn., Del., Fla., Ga., La., Maine, Md., Mass., Miss., N.H., N.J., N.Y., N.C., Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va.

Rhododendron viscosum is the most widespread and variable species of sect. Pentanthera and has been divided into as many as four species: R. coryi, R. oblongifolium, R. serrulatum , and R. viscosum in the narrow sense. In addition, minor varieties and forms have been described. Because correlated or geographically coherent sets of character states cannot be discerned within this species, infraspecific taxa are not recognized here (K. A. Kron 1993). Rhododendron viscosum is most closely related to R. arborescens , and possibly also R. atlanticum . Hybrids with R. cumberlandense and R. arborescens are known. Plants with white corollas and a yellow blotch may be the result of hybridization.

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

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Click on the thumbnail to see an enlargement

Rhododendron viscosum
Rhododendron viscosum
Clammy Azalea
ID: 0024 3291 1999 0051 [detail]
Frithjof Holmboe
© 2000 California Academy of Sciences

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