586 



ARBORETUM ET FRUTICETUM BRITANNICUM. 



variety has fragrant flowers, and, according to Sir W. J. Hooker, is 

 " amply worthy of a place in every garden and shrubbery." 



Readily known from R. ponticum and R, catawbiense by the rusty under 

 surface of the leaves, and the comparatively pale green of the entire plant. It 

 neither grows nor flowers so freely in British gardens as the other species. 



* 5 3. R. (m.) purpu^reum G. Don. The purple-Jlowered Rhododendron, 



or American Rose Bay. 



Idenlifictttion. Don's Mill., 3. p. 8)3. 



Si/nm'iyynes. R- maximum y purpiireum Pursh Fl. Amer. Sept. 1. p. 297. ; R. p6nticuin macro- 



' ph^llum Lodd. Cat. 

 Engraving. Our.^^.2096. in p. 1108. 



Spec. Char., Sfc. Leaves large, oblong-elliptic, flattish, acute, bluntish at the 

 base, green, and glabrous on both surfaces. Segments of corolla oblong 

 and obtuse. Calycine segments obtuse. This shrub approaches near to 

 R. ponticum ; but it differs in its foliaceous calyx, and otherwise. It 

 grows to an immense size; its stem being often found 18 in. and more in 

 diameter ; and its foliage triple the size of that of any other species. (Don^s 

 Mill.) A large evergreen shrub, or low tree. Virginia ami CaroHna, on 

 the highest mountains, near lakes. Height 25 ft. ; in England seldom seen 

 otherwise than as a shrub. Introduced ?. Flowers large, pui-ple; May 

 and June. Rare in British gardens. 



4. R. Pu'rsh// G. Don. Pursh's Rhododendron, or Ameiican Rose Baij. 



Identificntion. Don's Mill., 3. p. 843. 



Si/nont/iiic. R. maximum ^ album Pursh Fl. Amer. Sept. 1. p. 207. 



Engraving. OuTjftg. 110.^). from a specimen in Dr. Lindley's lierbarium. 



Spec. Char., Sfc. Arborescent. 

 Leaves cuneate-lanceolate, 

 flat, glabrous, tapering gra- 

 dually to the base, paler 

 . beneath. Calycine seg- 

 ments oval, obtuse. Seg- 

 ments- of corolla roundish 

 oblong. Flowers white, anil 

 smaller than those of R. 

 ma.\imnm. (Don's Mill) An 

 evergreen shrub. New Jersey 

 and Delaware, in shady cedar 

 swamps. Height 6 ft to 8 ft. 

 Introduced in ISli, but not 

 common in collections. Flow- 

 ers white ; June to August. The latest of all the rhododendrons in Briti?!i 

 gardens. Horticultural Society's Garden. 



B. !). R. catawbie'nse Michx. The 

 Catawba Rhododendron, 



Identification. Michx. Fl. Bor. Amer., 1. p. 258.; 



Don's Mill., 3. p. 843. 

 EngrariHfis. Bot. Mag., t. 1G71.; Bot. Cab., t. 



Ii76. ; and our y%. IIOG. 



Spec. Char., Src. Leaves short-oval, 

 rounded, and obtuse at both ends, 

 glabrous, of a different colour be- 

 neath. Calycine segments elongated 

 oblong. Flowers purple, disposed 

 in umbellate corymbs. (Do7i's Mil/.) 

 A large evergreen shrub. Virginia 

 and Carolina, [larticnlarly near the 

 head waters of the Catawba River. 

 Height 4 ft. Introd. in 1809 and 



1105. R. Pirshii. 



