848 



ERICACEAE. XLIII. RHODODENDRON. XLIV. VIREYA. 



not clammy, naked ; tube of corolla hardly longer than the seg- 

 ments ; calyxes very short : having one of the segments linear, 

 and 4 times longer than the rest ; filaments exserted ; branchlets 

 hispid. Tj . H. Native of Carolina and Georgia, on barren 

 sandy hills. Azalea bicolor, Pursh, fl. amer. sept. 1. p. 153. 

 Azalea nudifldra, var. bicolor, Ait. hort. kew. 1. p. 319. Trew. 

 ehret. t. 48. Flowers slender and smaller than the rest, of a 

 pale rose-colour, or nearly white, with a deep red-coloured 

 tube. 



Trvo-coloured-fiowered Rhododendron. Fl. May, June. Clt. 

 1734. Shrub 3 to 4 feet. 



48 R. GLAU'CUM ; branchlets hispid ; leaves oblanceolate, 

 acute, glabrous on both surfaces, glaucous beneath, ciliated on 

 the margins, having the mid-rib bristly ; flowers very clammy, 

 leafy ; tube of corolla twice longer than the segments ; calyx 

 very short ; filaments about equal in length to the segments of 

 the corolla. (7 . H. Native from New England to Virginia, in 

 swamps of a clayey soil. Azalea glauca, Pursh, fl. amer. sept. 

 1. p. 154. Lam. ill. p. 493. Wats, dendr. brit. 5. Azalea vis- 

 cosa, var. floribunda, Ait. hort. kew. 1. p. 319. Flowers white, 

 very fragrant. The shrub is dwarfer than other species of the 

 present section, and flowers in great abundance. Nuttall con- 

 siders this as only a variety of A. viscosa, differing in nothing 

 but in the under sides of the leaves being glaucous. 



G7fl!icos-leaved Rhododendron. Fl. June, July. Clt. 1734. 

 Shrub 2 feet. 



49 R. CANE'SCENS ; leaves obovate-oblong, downy above, and 

 tomentose beneath, not bristly on the middle nerve ; flowers not 

 clammy, nearly naked ; tube of corolla hardly shorter than the 

 segments ; teeth of calyx very short, rounded, obtuse ; stamens 

 hardly exserted. T? . H. Native of Lower Carolina, on the 

 banks of rivers ; and of Virginia, on the mountains of the Caca- 

 poon Springs, near Winchester. Azalea canescens, Michx. fl. 

 bor. amer. 1. p. 150. Wats, dendr. brit. 116. Flowers rose- 

 coloured. 



Canescent Rhododendron. Fl. May, June. Clt. 1812. Shrub 



3 to 4 feet. 



50 R. SPECIOSUM ; branches hairy ; leaves lanceolate, ciliated, 

 acute at both ends ; calyx pubescent ; corolla silky, with obtuse, 

 ciliated, lanceolate, undulated segments ; stamens exserted. Ij . 

 H. Native of North America. Azalea speciosa, Willd. enum. 

 p. 10. Lodd. bot. cab. 624. Wats, dendr. brit. 116. A coc- 

 cinea, Lodd. Flowers scarlet and orange-coloured. There are 

 several varieties of this species, varying in the shape of the 

 leaves and the colour of the flowers ; see Loud. hort. brit. p. 

 66. Lodd. bot. cab. 1255. 



Shorvy Rhododendron. Fl. May, June. Clt. ? Shrub 3 to 



4 feet. 



SECT. VIII. RHODORA (from pocov, rhodon, a rose ; colour of 

 flowers). Limb of calyx 5 -toothed. Corolla bilabiate ; upper 

 lip broadest, and 2-3-cleft ; lower one bidentate. Stamens 10. 

 Capsule 5-celled, 5-valved. Leaves deciduous. Habit of last 

 section. 



51 R. RHODORA ; leaves oval, quite entire, pubescent and 

 glaucous beneath ; flowers in terminal clusters, or racemose um- 

 bels. Tj . H. Native of Canada, Newfoundland, and on the 

 mountains of New York and Pennsylvania, in bogs. Rhodora 

 Canadensis, Lin. spec. 561. Lher. stirp. nov. 1. p. 141. t. 68. 

 Lam. ill. t. 364. Curt. bot. mag. 474. Flowers pale purple, 

 rising before the leaves. 



.Red-flowered Rhododendron. Fl. April, May. Clt. 1767. 

 Shrub 2 feet. 



Cult. Of all the genera in existence, Rhododendron comprises 

 the most handsome, elegant, and showy shrubs, well fitted for 

 adorning shrubberies, or to be grown singly on lawns. All the 

 species grow best in peat soil, or very sandy loam, or vegetable 



mould : they are either increased by layers or by seeds. When | 

 raised in the latter way, the seeds must be sown early in the 

 spring, in flat pans or pots, filled with peat earth, and covered very 

 slightly ; the pots or pans should then be set in a close frame, 

 or at the front of a hot-house, till the plants come up, watering 

 them very slightly when dry ; and as soon as the seedlings have 

 grown high enough to be laid hold of, they should be planted 

 out into other pans or pots, filled with the same kind of mould ; 

 after which they may stand in a close frame for a few days, until 

 they have struck fresh roots, and afterwards hardened to the air 

 by degrees. The smaller kinds of Rhododendron may be propa- 

 gated freely by cuttings, taken off from young wood, and planted 

 in sand, placing a bell-glass over them. There are now in the 

 gardens a great many hybrid kinds of Rhododendron, and are 

 still increasing in number ; some of which outvie the species in 

 splendour. The species natives of Nipaul, China, and Japan, 

 in mild winters, would probably succeed in the open air, but 

 they will not survive a severe winter without protection ; they 

 are therefore best kept in pots, and placed among other green- 

 house or frame plants. R. arbdreum and R. album are among the 

 most showy of the species, and are well adapted for conserva- 

 tories, or to be placed in large tubs in the greenhouse. Young 

 cuttings of the tender kinds, if torn ofF close to the stem, and 

 planted in a pot of sand, will strike root readily ; the pot should 

 be plunged in heat under a hand-glass. 



XLIV. VIRE'YA (named by Blume after M. Virey, a French 

 physician). Blum, bijdr. p. 854. 



LIN. SYST. Decdndria, Monogynia. Calyx small, obsoletely 

 5-toothed. Corolla subcampanulate, or funnel-shaped, regular, 

 5-lobed, adnate to the disk of the calyx. Stamens 10, inserted 

 in the calycine disk ; alternate filaments the shortest ; anthers 

 oblong, bursting inwardly, naked, dehiscing by two pores at the 

 apex. Style filiform ; stigma capitate, 5-furrowed. Capsule 

 silique-formed, 5-angled, 5-celled. Placenta 5-lobed. Seeds 

 numerous, expanded into a bristle-formed awn at both ends. 

 This genus differs from Rhododendron in the calyx being small, 

 and in the stamens not being attached to the corolla in any 

 way. Mostly parasitical shrubs. Leaves scattered and verti- 

 cillate, quite entire, coriaceous, covered with scaly dots beneath. 

 Flowers disposed in terminal fascicles. 



* Corollas subcampanulate. 



1 V. JAVA'NICA (Blum, bijdr. 854.) leaves oblong-lanceolate, 

 clothed with fine rusty dots beneath ; flowers showy, deep 

 orange. T? . G. Native of Java, at the foot of Mount Salak, 

 where it is called by the natives Gaga Mirha, 



Var. ft ; flowers citron-coloured, smaller. 

 Java Vireya. Fl. Year. Shrub. 



2 V. A'LBA (Blum, bijdr. 855.) leaves lanceolate, densely 

 clothed with rusty scales beneath : flowers white, middle-sized. 

 f?-. G. Native of Java, on Mount Salak, parasitical upon trees. 



Rhododendron album, Blum. cat. hort. buitenz. p. 72. 

 rF/iz<e-flowered Vireya. Fl. Year. Shrub. 



* * Corollas funnel-shaped. 



3 V. TUBIFLORA (Blum, bijdr. p. 855.) leaves lanceolate, 

 densely clothed with rusty dot-like scales beneath ; flowers 

 scarlet. 1? . G. Native of Java, on the higher mountains. 



Tube -flowered Vireya. Fl. Year. Shrub. 



4 V. CELE'BICA (Blum. 1. c.) leaves broad, lanceolate, clothed 

 with rusty dot-like scales beneath ; flowers scarlet, fy . G. 

 Native of the Celebes, in mountain woods. 



Celebes Vireya. Fl. Year. Shrub. 



5 V. RETtTsA (Blum, bijdr. p. 856.) leaves spatulate, retuse, 

 with recurved margins, beset with rusty dots beneath ; branches 



