ERICACEAE. XLIII. RHODODENDRON. 



847 



40 R. FLA'VUM ; flowers leafy, clammy ; leaves ovate, oblong, 

 pilose, ciliated ; corolla funnel-shaped ; stamens very long. Jj . H. 

 Native of the Levant, at Pontus; Caucasus, Turkey, &c. Azalea 

 Pontica, Lin. spec. 1669. Curt. hot. mag. t. 433. Azalea ar- 

 bdrea, Lin. spec. ed. 1. p. 150. Buxb. cent. 5. p. 36. t. 69. 

 Flowers fine yellow. Leaves shining. There are a great num- 

 ber of varieties of this species in the gardens, differing princi- 

 pally in the colour of the flowers, and the hue of the leaves. 

 The flowers are of all shades, from yellow to copper or orange- 

 colour. They are sometimes white, (see Sims, bot. mag. 2383.), 

 and are sometimes striped with yellow and red. 



Yellorv-fiowered Rhododendron. Fl. May, June. Clt. 1793. 

 Shrub 4 to 6 feet. 



41 R. NUDIFLORUM (Torr. fl. un. st. 1. p. 140.) leaves lanceo- 

 late-oblong, nearly smooth and green on both surfaces, ciliated 

 on the margins, having the mid-rib bristly beneath, and woolly 

 above ; flowers rather naked, not clammy ; tube of corolla 

 longer than the divisions ; teeth of calyx short, rather rounded ; 

 stamens much exserted. Tj H. Native from Canada to 

 Georgia, on the sides of hills. Azalea nudifiora, Lin. spec. 214. 

 Azalea periclymenoides, Michx. fl. bor. amer. 1. p. 151. This 

 beautiful shrub has a great many varieties, besides those men- 

 tioned below, for which see Loud. hort. brit. p. 66. and supple- 

 ment, among which is one with double flowers. Flowers scar- 

 let, pink, white, striped, variegated, red, purple, &c., disposed 

 in terminal clustered racemes, appearing before the leaves. The 

 variety ij proves clearly that Azalea and Rhododendron are not 

 generically distinct. 



Var. a, coccineum (Sims, bot. mag. 180.) flowers scarlet ; 

 leaves lanceolate. Jj . H. Native of Georgia, near Savannah. 



Var. ft, rutilans (Pursh, fl. amer. sept. 1. p. 152.) flowers 

 deep red ; calyxes minute, f; . H. Ait. hort. kew. p. 319. 



Far. y, c&rneum (Pursh,!. c.) corollas pale red, having the tube 

 red at the base ; calyx foliaceous. J? H. Ait. 1. c. Ker. bot. 

 reg. 120. 



Var. S, album (Pursh, 1. c.) flowers white ; calyx middle- 

 sized. T? . H. Ait. 1. c. 



Var. t, papilionaceum (Pursh, 1. c.) flowers reddish, with the 

 lower segment white ; calyx foliaceous. Tj . H. Ait. 1. c. 



Far. , parlllum (Pursh, I. c.) flowers pale red, 5-parted even 

 to the base. Ij . H. Ait. 1. c. 



Far. i), polyandrum (Pursb, 1. c.) flowers rose-coloured, 

 short; stamens 10-20. fj . H. Native near Philadelphia. 



Far. 6, Govenianum ; branches tomentosely downy ; leaves 

 evergreen or deciduous, oblong, acute, downy while young, but 

 glabrous in the adult state, and recurved at the apex ; tube of 

 corolla a little shorter than the segments. Tj . H. A hybrid, 

 raised from the seed of R. nudiflbrum, impregnated by the pollen 

 of a hybrid raised between R. Ponticum and R. Catawbiense. 

 Flowers delicate light purple, disposed in terminal racemose 

 corymbs. R. Govenianum, Sweet, fl. gard. 3. t. 263. 



Far. , rubrum (Lodd. bot. cab. t. 51.) flowers red. Tj . H. 



Naked-flowered Rhododendron. Fl. April, June. Clt. 1734. 

 Shrub 3 to 4 feet. 



42 R. VISCOSUM (Torr. 1. c.) leaves oblong-obovate, acute, 

 smooth and green on both surfaces, ciliated on the margins, 

 having the mid-rib bristly ; flowers clammy, leafy, hairy ; tube of 

 corolla as long as the segments ; teeth of the calyx short, 

 rounded ; stamens hardly longer than the corolla, t? . H. Na- 

 tive from Canada to Georgia, in swamps and shady woods. 

 Azalea viscosa, Lin. spec. 214. Pluk. aim. 106. t. 161. f. 4. 

 Catesb. car. 1. t. 57. Flowers white, sweet-scented, in terminal 

 clusters, downy. There are a great number of varieties of this 

 species, (see Loud. hort. brit. p. 66.), varying in the colour of the 

 flowers, and otherwise. The flowers are white and red, and 

 variegated with these colours. There is a downy variety with 

 red flowers figured in Lodd. bot. cab. t. 441. 



Far. ft, ornatum (Sweet, fl. gard. n. s. 137-). A hybrid raised 

 from the seed of R. viscomm fl rubescens, fertilized by the pollen 

 of R. Ponticum. 



Clammy-flowered Rhododendron. Fl. July, Aug. Clt. 1734. 

 Shrub 2 to 4 feet. 



43 R. CALENDULA V CEUM (Torr. 1. c.) leaves oblong, pubes- 

 cent on both surfaces, at length hairy ; flowers large, not 

 clammy, rather naked ; teeth of calyx oblong ; tube of corolla 

 hairy, shorter than the segments. Tj . H. Native from Penn- 

 sylvania to Carolina. Azalea calendulacea, Michx. fl. bor. amer. 

 1. p. 156. Lodd. bot. cab. 1394. A. nudiflora, var. coccinea, 

 Ait. hort. kew. 319. Flowers yellow, red, orange-coloured, 

 and copper-coloured. Sims, bot. mag. 172. Lodd. bot. cab. 

 1394. or flame-coloured. Ker. bot. reg. 145. Said to be 

 the handsomest shrub in North America. There are a great 

 many varieties of it, varying in the colour of the flowers. See 

 Loud. hort. brit. p. 66. 



Far. ft, Morterii (Sweet, fl. gard. n. s. t. 10.) A hybrid be- 

 tween R. calenduldceum and one of the red varieties of R. nudi- 

 flbrurn. There are also two kinds of this ; one with a flesh- 

 coloured corolla, having the upper segment orange-coloured, 

 edged with flesh-colour, called R. Morterii earned ; and another 

 called Morterii, var. prc^slans, with pale copper-coloured flowers, 

 tinged with blush. 



Marygold Rhododendron. Fl. May, June. Clt. 1806. Shrub 

 2 to 6 feet. 



44 R. ARBORE'SCENS (Torr. 1. c.) leaves obovate, rather ob- 

 tuse, smooth on both surfaces, glaucous beneath, ciliated on the 

 margins, having the mid-rib almost smooth ; flowers not clammy, 

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

 with the segments oblong and acute ; filaments exserted. fj . 

 H. Native of Pennsylvania, on the sides of rivulets near the 

 Blue Mountains. Azalea arborescens, Pursh, fl. amer. sept. 1. 

 p. 153. Flowers large, reddish; leaves of flower-buds large, 

 yellowish brown, surrounded with a fringed white border. 



Arborescent Rhododendron. Fl. May, July. Clt. 1818. 

 Tree 10 to 20 feet. 



45 R. NITIDUM (Torr. 1. c.) branches smoothish ; leaves ob- 

 lanceolate, rather mucronate, coriaceous, smooth on both sur- 

 faces, shining above, having the nerve bristly beneath, with revo- 

 lute ciliated margins ; flowers clammy, leafy ; tube of corolla a 

 little longer than the segments ; calyx very short ; filaments 

 exserted. Tj H. Native from New York to Virginia, in deep 

 mossy swamps on the mountains. Azalea nitida, Pursh, fl. 

 amer. sept. 1. p. 153. Ker. bot. reg. 414. Flowers white, 

 tinged with red. Leaves dark green, shining, smaller than any 

 other species of the present section. 



SVimmg-leaved Rhododendron. Fl. June, July. Clt- 1812. 

 Shrub 2 to 4 feet. 



46 R. HISPIDUM (Torr. 1. c.) branches straight, very hispid ; 

 leaves long-lanceolate, hispid above, and smooth beneath, glau- 

 cous on both surfaces, ciliated on the margins, having the nerve 

 bristly beneath ; flowers very clammy, leafy ; tube of corolla 

 wide, scarcely longer than the segments ; teeth of calyx oblong, 

 rounded ; filaments exserted. T? . H. Native of New York 

 and Pennsylvania, on the borders of lakes on the highest part of 

 the Blue Mountains. Azalea hispida, Pursh, fl. amer. sept. 1 . 

 p. 154. Wats, dendr. brit. 6. Azalea viscosa, var. glauca, Ait. 

 hort. kew. 1. p. 319. ? Flowers white, with a red border, and 

 a tinge of red on the tube, which makes them appear to be of a 

 rose-colour before expansion. Stamens sometimes 10. This 

 species may be distinguished from the rest of the present section 

 by its bluish appearance. 



Hispid Rhododendron. Fl. July, Aug. Clt. 1734. Shrub 

 10 to 15 feet. 



47 R. BICOLOR ; leaves oblong, clothed on both surfaces with 

 fine hoary pubescence, not bristly on the nerve ; flowers small, 



