296 MISC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 
Rhododendron austrinum (Small) Rehd. 
Azalea austrina Small. 
Range: 30. 
Site: Well-drained, moist, shade. 
Fruit: Capsule. 
A large shrub; flowers April-May; commonly occurs on sandy soil. 
Rhododendron calendulaceum (Michx.) Torr. Flame azalea. 
Azalea calendulacea Michx., A. lutea L. 
Range: 27, 28. 
Site: Well-drained, sun, shade. 
Fruit: Capsule. 
A small to large shrub; flowers May-June; branches erect or spreading; very 
ornamental. 
Rhododendron californicum Hock. California rose-bay. 
R. macrophyllum Don. 
Range: 1, 2. 
Site: Well-drained, sun. 
Fruit: Capsule. 
A small to large shrub or rarely a smail tree; evergreen; flowers May-June; 
considered poisonous to sheep. 
Rhododendron canadense (L.) B. S. P. Rhodora. 
R. canadense Torr., R. rhodera Gmel., Rhodora canadensis UL. 
Range: 26, 27. 
Site: Well-drained, moist, sun. 
Fruit: Capsule. 
A smail, much-branched shrub; flowers in May. 
Rhododendron canescens (Michx.) Sweet. Hoary azalea. 
Azalea canescens Michx, not Small. 
Range: 26, 27, 28, 29, 30. 
Site: Well-drained, moist, sun, shade. 
Fruit: Capsule. 
A large sparingly-branched shrub, flowers April-May; occurs in sandy and 
other soils. 
Rhododendron carolinianum Rehd. Carolina rhododendron. 
Range: 27%. 
Site: Well-drained, sun. 
Fruit: Capsule. 
A large, much-branched evergreen shrub; flowers April—May. 
Rhododendron catawbiense Michx. (pl. 31). Catawba rhododendron. 
Range: 27, 28. 
Site: Dry, well-drained, moist, sun. 
Fruit: Capsule. 
A large evergreen shrub; flowers May—June; often forms thickets covering 
extensive tracts of land; poisonous to livestock either fresh or dry. 
Rhododendron cuthbertii, see Rhododendron minus. 
Rhododendron lapponicum (L.) Wahl. Lapland rose-bay. 
Azalea lapponica Ti. 
Range: 26. 
Site: Dry, well-drained, sun. 
Fruit: Capsule. 
A small, prostrate evergreen shrub, commonly occurring on alpine summits. 
Rhododendron macrophyllum, see Rhododendron californicum. 
Rhododendron maximum L. Rhododendron. 
Range: 24, 26, 27. 
Site: Well-drained, moist, sun, shade. 
Fruit: Capsule. 
A large shrub to small tree; evergreen; flowers June—July; thicket forming ; 
much cultivated. 
Stomach records: Sharp-tailed grouse; white-tailed deer. Observations: 
Eaten by deer but poisonous to them if taken in large quantities. Poisonous 
to stock, which avoid it unless very hungry. 
