590 ARBORETUM ET FRUTICETUM BR1TANNICUM. 



flowers, except one found in Java by Dr. Horsfield. (Dons Mill.) A 

 glabrous evergreen shrub. Nepal, on Gossainthan. Height 3 ft. to 5 ft. 

 Introduced in 1825. Flowers pale pink, changing to white ; April. 



A beautiful and very distinct species, and quite as hardy in British gardens 

 as any of the American kinds. 



Rhododendron arboreum Smith. Several hybrids between this species and 

 R. ponticum and R. catawbiense have been raised, but those only between 

 the American and the more northerly European species have been found 

 tolerably hardy. 



R. a. venustum D. Don (Brit. Fl.-Gard. May, 1835, 2d ser. t. 285.) is a 

 hybrid, and an exceedingly showy and interesting plant. It was raised by 

 Mr. Wm. Smith, nurseryman, Norbiton Common, near Kingston, Surrey, 

 from seeds of R. caucasicum that had been fertilised by the pollen of R. 

 arboreum ; and appears sufficiently hardy to survive our winters with a little 

 protection. 



ill. Pogonanihum. 



Derivation. From pogon, a beard, and anthos, a flower ; throat woolly inside. 



Sect. Char. Limb of calyx short, 5-lobed. Corolla salver-shaped, with a cy- 

 lindrical tube, and a spreading limb. Stamens 5, enclosed. Ovarium 5-celled. 

 Evergreen shrubs. Leaves coriaceous. 



. 13. R. ANTHOPO^GON D. Don. The bearded-flowered 

 Rhododendron. 



Identification. D. Don in Mem. Wern. Soc., 3. p. 409. ; Don's Mill., 3. p. 845. 



Synonyms. It. aromaticum Wall. Cat. 



Engravings. Royle Illust., t. 64. f. 2. ; and our fig. 1115. 



Spec. Char., $c. Branchlets downy. Leaves oval, rusty 

 beneath from lepidoted tomentum. Corollas with a woolly 

 throat. Shrub much branched. Leaves ending in a 

 reflexed mucro, naked above. Flowers glomerate, sulphur- 

 coloured. Pedicels short, lepidoted, and resinous. Caly- 

 cine segments rounded at the apex, with villous margins. 

 Segments of corolla roundish, with undulated curled 

 margins. Filaments glabrous. Stigma clavate. (Don's Mill.} 

 An upright evergreen shrub, with the habit of R. dauricum. 

 Nepal, on Gossainthan. Height 1ft. to lft. Intro- 

 duced in 1820. Flowers yellow ; April and May. 



A very interesting species, from the colour of its flowers 

 and their early appearance. Plants have survived the 

 winter of 1837-8 in the Hackney Arboretum. 1115 



iv. Lepipherum D. Don. 



Derivation. From lepis, a scale, and phero, to bear ; leaves covered with small scales. 



Sect. Char. Limb of calyx dilated, 5-lobed. Corolla campanulate or rotate. 

 Stamens 10. Ovarium 5-celled. Leaves membranous; sometimes deciduous, 

 but generally persistent. Shrubs, evergreen or deciduous ; natives of Eu- 

 rope, North America, and the Himalayas. 



!U 14. R. LAPPO'NICUM Wahl. The Lapland Rhododendron. 



Identification. Wahl. Fl. Suec., p. 249. ; Don's Mill., 3. p. 845. 



St/nonymcs. Azalea lapponica Lin. Fl. Suec. p. 64., Sp. t. 214. ; A. ferruginea Hort. 



Engravings. Bot. Mag., t 3106. ; and our fig. 1116. 



Spec. Char., fyc. Shrub branched, procumbent. Branches divaricate. Co- 

 rollas rotately funnel-shaped. Young branches obscurely pubescent, warted. 

 Leaves oblong, obtuse, stiff, beset with honeycomb-like dots, yellowish and 

 scaly beneath ; deep green above ; and pale green, and at length yellowish, 

 beneath j thickly beset with hollow dots on both surfaces, which are covered 



