XLIII. .ERICACEAE: RHODODENDRON. 



591 



by umbilicate permanent scales. Flowers crimson, 

 disposed in umbellate corymbs, 5 6 together, sur- 

 rounded by large dotted scales, or bracteas. Calyx 

 covered with yellow scales, ciliated. Segments of 

 corolla unequal, and undulated. Stamens 5 8, equal- 

 in length to the corolla. Stigma capitate, 5-lobed. 

 Filaments hairy at the base. (Don's Mill.) A procum- 

 bent evergreen shrub. Europe, Asia, and North America, 

 in the Arctic regions. Height 6 in. to 1 ft. Introduced in 

 1825. Flowers crimson ; May. 



fife 15. R. DAU'RICUM L. The Dahurian Rhododendron. 



Identification. Lin. Sp., 562. ; Don's Mill., 3. p. 845. 



Engravings. Pall. Fl. Ro.iS., 1. p. 47. t. 32. j Bot. Mag., t. 836. ; and our 

 Af. 1117. 



1116. R. lappdnicum. 



Spec, Char. y fyc. Leaves deciduous ; oblong, attenuated at both ends, glabrous, 

 but sprinkled with rusty scales, especially beneath. Limb of calyx 5-toothed. 

 Corollas rotate. Roots knobbed, abounding in fibres. Stems twisted 

 and knobbed in the wild state. Petioles downy. Leaves dotted on both 

 surfaces, but ferruginous beneath. Before they fall in autumn, they become 

 of a dusky red colour. The flowers rise before the leaves, 

 from the tops of the branches, from buds which are com- 

 posed of concave downy scales. (Don's Mill.) A deciduous 

 shrub. Siberia, peculiar to the alpine tracts of Eastern 

 Asia. Height 2ft. to 6ft. Introduced in 1780. Flowers 

 purple ; December to March. 



Variety. 



& * R. d. 2 atromcns Ker. (Bot. Reg., t. 194 ; Bot. Mag., 

 t. 1888.) Sub-evergreen. Leaves deep green, and 

 shining above ; persistent. Siberia. 



Very desirable low shrubs, from their flowering so early in 

 the season ; but, to thrive, they require peat soil. ni?. R.dauricum. 



R. lepiddtum Wall. (Royle Illust., p. 260. t. 64. f. 1. ; Don's Mill., 3. p. 845.) 

 is a native of Nepal, with the habit of R. dauricum, but with leaves of a 

 thinner texture; and with every part of the plant beset with ferruginous 

 scale-like dots. It grows to the height of 2 or 3 feet, but has not yet been 

 introduced. 



v. Cham&cistus D. Don. 



Derivation. From chamai, on the ground, and cislus, the rock rose; plants with the habit of 

 species of Helianthemum. 



Sect. Char. Limb of calyx foliaceous, 5-cleft. Corolla rotate. Stamens 10. 

 Ovarium 5-celled. Diminutive, prostrate, evergreen 

 shrubs, with small membranous leaves. 



!U 16. R. CAMTSCHA'TICUM Pall. The Kamtschatka 

 Rhododendron. 



Identification. Pall. Fl. Ross., 1. p. 48. t 33. ; Don's Mill., 3. p. 845. 

 Engravings. Grael. Sib., 4. p. 126. No. 13. ; and OUT Jig. 1118. 



Spec. Char., $c. Leaves obovate, acutish, 5-nerved, 

 naked, ciliated ; peduncles hairy, usually twin. Caly- 

 cine segments ciliated, foliaceous. Corollas purple, 

 rotate. (Don's Mill.) A prostrate evergreen shrub. 

 Kamtschatka and the Aleutian Islands, in muddy 

 places on the mountains. Height 6 in. to 1 ft. In- 

 troduced in 1802, but rare in British gardens. Flow- 

 ers purple ; July. 1118 . R . camtscM 



