2942 



RHODODENDRON 



RHODODENDRON 



31. arborescens, Torr. (Azalea arborescens, Pursh). 

 SMOOTH AZALEA. Fig. 3388. From 8-20 ft. : branchlets 

 glabrous: Ivs. obovate or obovate-oblong, acute, ciliate, 

 glabrous, green or glaucescent beneath, 2-4 in. long: 

 fls. white or tinged rose, 2 in. long, fragrant; style and 

 stamens red. June, July. Alleghany Mts. G.F. 1 : 401 

 (adapted in Fig. 3388). C.L.A. 11:496. Gn.M. 5:219. 

 L.B.C. 17:1632 (as A. verticillata), 



32. viscdsum, Torr. (Azalea viscosa, Linn.). WHITE 

 SWAMP HONEYSUCKLE. From 4-8 ft.: winter buds 

 glabrous: branchlets with stiff hairs: Ivs. obovate- 

 oblong, obtuse or mucronulate, ciliate, bristly hairy on 

 the veins beneath, 2-4 in. long: fls. white or tinged rose, 

 l^z-2 in. long, viscid outside, fragrant; style red. June, 

 July. E. N. Amer. Em. 2:438. Mn. 10:81. C.L.A. 

 11:496. Var. nitidum, Gray. From 1-3 ft.: Ivs. 



3388. Rhododendron arborescens. ( X }s) 



oblanceolate, bright green on both sides: corolla tinged 

 red. B.R. 414. Var. glaftcum, Gray. Lvs. whitish- 

 glaucous beneath, dull and glaucous above. L.B.C. 

 16:1518. Var. hispidum, Schneid. (Azalea hispida, 

 Pursh). Pedicels bristly hispid: fls. usually pink: Ivs. 

 glaucescent beneath. L.B.C. 5:441. 



33. nudifldrum, Torr. (Azalea lutea, Linn., partly. A. 

 nudiflora, Linn.). PINXTER FLOWER. Figs. 3389, 3390. 

 Height 2-6 ft.: winter buds more or less pubescent: 

 branchlets pubescent and often with stiff hairs: Ivs. 

 oblong or obovate, strigose on the midrib beneath, 2-4 

 in. long: fls. pink to nearly white, before the Ivs., about 

 l]/2 in. broad, strigose or slightly glandular outside, 

 faintly fragrant; pedicels strigose-hairy. April, May. 

 Mass, to Fla. and Texas. B.R. 120. L.B.C. 1:51. 

 Mn. 2:17. Gn. 29, p. 550. 



34. canescens, Don (Azalea canescens, Michx.). 

 Shrub, 1-3 ft.: similar to the preceding: Ivs. oval to 

 elliptic or obovate, soft-pubescent beneath, at least 

 when young, 1 3/2-3 in. long: pedicels glandular: fls. 

 pink to nearly white, 1^-2 in. broad, glandular out- 

 side, very fragrant; stamens slightly exserted. April, 

 May. N.H. to Fla. and La. 



35. calendulaceum, Torr. (R. liiteum, Schneid., not 

 Sweet. Azalea calenduldcea, Michx. A. liitea, Linn., 

 partly. A. aurantlaca, Dietr. A. speciosa, Willd.). 

 FLAME-COLORED AZALEA. From 4-10 ft.: branchlets 

 glabrous or with stiff hairs: Ivs. obovate or ovate, 

 usually pubescent beneath, serrulate-ciliate : fls. orange- 

 yellow to orange-red or flame-red, often 2 in. broad, 

 with the Ivs., nearly scentless; tube usually shorter 

 than the limb; stamens thickened at the middle. May, 



3389. Rhododendron nudiflorurn. 

 (XX) 



June. E. N. Amer. C.L.A. 11:496. Gn. 29, p. 550. 

 B.R. 145. L.B.C. 7:624. B.M. 180. Var. crdceum, 

 Rehd. Fls. yellow or orange-yellow. B.M. 1721. L.B.C. 

 14:1324. One of the most showy species. 



36. liiteum, Sweet (R. flavum, Don. Azalea pontica, 

 Linn.). Shrub, 2-6 ft.: branchlets hairy: pedicels and 

 petioles glandular: Ivs. 



cuneate, oblong, usually 

 hairy on both sides when 

 young, 2-4 in. long: fls. 

 yellow, 2-2% m - broad, 

 very fragrant; stamens as 

 long as the limb. May. 

 Orient, Caucasus. B.M. 

 433; 2383 (var. albiflora). 

 C.L.A. 11:495. G. 27:15. 

 Gn. 29, p. 550. G.M. 36: 

 500. A very fragrant 

 and free-flowering species, 

 not common in cult. 

 Nearly all varieties re- 

 ferred to this species in 

 nursery catalogues are 

 hybrids and belong to the 

 so-called Ghent azaleas, 

 R. Morteri, Sweet (Azalea 

 Mortieriana, S p a e . A . 

 gandavensis, Hort.); see p. 2935. 



37. sinense, Sweet (R. m6lle, Don. Azalea sinensis, 

 Lodd. A. mdllis, Blume). Shrub, to 5 ft.: young 

 branchlets pubescent and often setose: winter buds 

 grayish pubescent: Ivs. oblong to oblong-oblanceolate, 

 obtuse and mucronate, cuneate at the base, ciliate and 

 often revolute at the margins, soft-pubescent beneath, 

 2J^-3^ in. long: fls. in many-fld. heads; pedicels 

 puberulous; calyx-lobes short, rounded, ciliate; corolla 

 campanulate-funnelform, yellow, upper lobe spotted 

 greenish, 2 in. across; stamens snorter than limb. 

 April, May. China. B.R. 1253. L.B.C. 9:885. Ten- 

 derer than the following species with which it has 

 been confused. It has entered largely into the parentage 

 of the so-called Ghent azaleas, and some of them, 

 particularly Anthony Koster, are little different from 

 true R. sinense. 



38. japonicum, Suring. (R. molle, Miq., not Don. 

 Azalea japonica, Gray. A. mollis, Hort., not Blume). 

 Fig. 3392. Shrub, to 6 ft.: young branchlets glabrous, 

 sometimes setose: winter buds glabrous: Ivs. obovate to 

 obovate-oblong, obtuse and mucronate, cuneate at the 

 base, ciliate, glabrous or sparingly setose above, gla- 

 brous below except setose on the midrib, 13^-3 in. long: 

 fls. in dense heads; pedicels setose; calyx-lobes ovate, 

 setose; corolla campanulate-funnelform, 2 in. across, 

 salmon-red, brick-red, or carmine; stamens shorter 

 than limb. April, May. Japan. F.S. 19:2032-6. Gn. 

 29, p. 551; 33, p. 324; 42, p. 369; 46, p. 546; 59:403. 

 Gn.M. 4:24. C.L.A. 4:210; 5: 147; 11:495. Gt. 16:556; 



57:1575. M.D.G. 1906:556. G. 

 2:503; 5:219. Gng.4:279. S.I.F. 

 2:62. This and the preceding 

 species have been hybridized ex- 

 tensively with R. luteum and the 

 American azaleas and almost all 

 the varieties now in trade under 

 the names of these two species 

 are hybrids. The type of R. 

 jo,ponicum has been reintro. from 

 Japan by C. S. Sargent and that 

 of R. sinense from China by E. H. 

 Wilson, andthey have been distri- 

 buted by the Arnold Arboretum. 

 R. japonicum is hardy at the 

 Arnold Arboretum; R. sinense is 



Capsule of Rhododendron tenderer, but stands ordinary 

 nudiflorum. winters in favorable positions. 



3390. 



