Rhododendron viscosum

Family (Traditional)Ericaceae
Species:Rhododendron viscosum Torr.
Common NameSwamp Azalea
Growth Habitshrub
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Woody; Natural Area Presence: BFM; Duration: Perennial; General Ecology: Terrestrial; Growth Habit: shrub; Moisture Requirements: Mesic; Moisture Requirements: Mesic-Hydric; Moisture Requirements: Hydric; Moisture Requirements: Wetland; Region of Origin: North America; Reproductive Phenology: June; Reproductive Phenology: July; Leaf Arrangement: alternate; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Fragrance: No; Leaf Persistance: Deciduous; Leaf Petiole Type: petiolate; Leaf Type: broadleaf; Leaf Venation: pinnate; Leaflet Margins: ciliate; Leaflet Margins: entire; Leaflet Margins: serrulate; Leaflet Number: 0; Base Flower Color: White; Carpel Number/Pistil: 5; Fruit Dehiscence: Yes; Fruit Type: Capsule; Fruit Wet/Dry: Dry; Hypanthium Present: No; Inflorescence Position: terminal; Inflorescence Types: corymb/cyme/umbel; Ovary Position: Superior; Overall Flower Symmetry: Zygomorphic; Ovules per Carpel: 13+; Perianth Present: Yes; Petal Fusion: Yes; Petal Number: 5; Pistil Complexity: Compound; Pistil Number: 1; Placentation Type: Axillary; Sepal Fusion: Yes; Sepal Number: 5; Sexuality: monoclinous; Sporangium Arrangement: N/A; Stamen Number: 5; Tepal Fusion: No; Tepal Number: 0
C value 7
StatusNative; AGCP (OBL), EMP (FACW) (NWPL); TN[SNR] (State Rank); G5 (Global Rank)
Specimen(s) View and Download Specimen Details »

** Not applicable or data not available.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display the its name. Click the question mark icon () to view additional information about the ecoregions shown. In the map legend, there are links to toggle the visibility of the ecoregions and/or their labels. In addition, clicking on an ecoregion name will highlight that region on the map.

  • State Boundaries
  • Counties
  • Counties - Species Present
  • Southeastern Plains
    • Blackland Prarie
  • Blue Ridge Mountains
  • Ridge and Valley
  • Cumberland Plateau
  • Cumberland Mountains
  • Allegheny Plateau
  • Interior Plateau
    • Bluegrass Region
    • Nashville Basin
    • Pennyroyal Karst Plain
    • Western Highland Rim
    • Eastern Highland Rim


SynonymFull Citation
Azalea glauca Azalea glauca Lam.
Azalea hispida Azalea hispida Pursh
Azalea nitida Azalea nitida Pursh
Azalea oblongifolia Azalea oblongifolia Small
Azalea serrulata Azalea serrulata Small
Azalea viscosa Azalea viscosa L.
Rhododendron coryi Rhododendron coryi Shinners
Rhododendron hispidum Rhododendron hispidum (Pursh) Torr.
Rhododendron nitidum Rhododendron nitidum (Pursh) Torr.
Rhododendron serrulatum Rhododendron serrulatum (Small) Millais
Rhododendron viscosum var. aemulans Rhododendron viscosum var. aemulans Rehder
Rhododendron viscosum var. glaucum Rhododendron viscosum var. glaucum (Michx.) Torr.
Rhododendron viscosum var. montanum Rhododendron viscosum var. montanum Rehder
Rhododendron viscosum var. nitidum Rhododendron viscosum var. nitidum (Pursh) A.Gray
Rhododendron viscosum var. serrulatum Rhododendron viscosum var. serrulatum (Small) H.E.Ahles
Rhododendron viscosum var. tomentosum Rhododendron viscosum var. tomentosum Rehder in E.H.Wilson & Rehder
Rhododendron viscosum var. viscosum Rhododendron viscosum var. viscosum

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort.

Counties included on distribution map: Clinton (KY), Coffee (TN), Hamilton (TN), Morgan (TN), Polk (TN), Putnam (TN), White (TN)

Herbaria represented by specimen data listed below: EKY, HTTU, MTSU, UCHT, VDB

Range of years during which specimens were collected: 1999 - 2002

Accession No. (click for full details) County State Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
UCHT022288 White Tennessee
Rhododendron viscosum
UCHT022285 Polk Tennessee
Rhododendron viscosum
MTSU017605 Coffee Tennessee 16 Apr 2002 Brooke Todd
Rhododendron viscosum
BRIT110643 Tennessee
Rhododendron viscosum
UCHT022294 Tennessee
Rhododendron viscosum
HTTU014612 Putnam Tennessee
Rhododendron viscosum
31234100406998 Clinton Kentucky 03 Aug 1999 Mark A. Gorton
Rhododendron viscosum
BRIT110642 Tennessee
Rhododendron viscosum
31234100406980 Clinton Kentucky 03 Aug 1999 Mark A. Gorton
Rhododendron viscosum
UCHT022289 Hamilton Tennessee
Rhododendron viscosum
UCHT022293 Tennessee
Rhododendron viscosum
HTTU007843 Morgan Tennessee
Rhododendron viscosum
UCHT022286 Polk Tennessee
Rhododendron viscosum
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Plant Photos

Rhododendron viscosum - Milo Pyne
Rhododendron viscosum - Milo Pyne
Rhododendron viscosum - Milo Pyne
Rhododendron viscosum - Milo Pyne