RHODODEXDROX 



RHODODEXDROX 



2941 



southern Alleghanies. Hardy as far north as New 

 England. 



27. maximum, Linn. GREAT LATTREL. Fig. 3387. 

 Shrub, or small tree, attaining 35 ft.: Ivs. mostly acute 

 at base, narrow-oblong or lanceolate-oblong, acute or 

 shortly acuminate, whitish beneath, 4-10 in. long: clus- 

 ters many-fld.; pedicels viscid; calyx-lobes oval, as long 

 as ovary: corolla campanula te, deeply 5-lobed with oval 

 lobes, usually rose-colored, spotted greenish within, 

 about l j i in. across; ovary glandular. June, Julv. 

 Nova Scotia and Ont. to Ga. B.M. 951. Em. 2:435. 

 Mn. 1:1 and 3, p. 22. C.L.A. 3:32; 4:105. G.W. 15, 

 p. 623. This is one of the hardiest species, being hardy 

 as far north as Que. and Ont. Three varieties have been 

 distinguished: var. album, Pursh (R. Purshii, Don\ 

 with white fls. : var. purpureum, Pursh (R. pur- 

 pureum. Don i. with purple fls., and var. rdseum, 

 Pursh. with pink fls. This species and the fol- 

 lowing are now often extensively used in park- 

 planting and taken by the carloads from the 

 woods. If properly handled and taken from a 



turfy soil with a sufficient ball of earth around 

 the roots, they are usually successfully trans- 

 planted. 



28. azaleoides, Desf. (R. fragrant, Lodd. R. 

 odoratum, Paxt.). Hybrid between R. minus 

 and R. nudiflorum. Shrub, a few feet high: Ivs. 

 leathery but thin, elliptic to oblong, acute at 

 both ends, dark green above, paler beneath, 

 sometimes pubescent when young: fls. funnel- 

 form-campanulate, pinkish or whitish, fragrant, 



- in. across: calyx with ciliate lobes. May, 

 June. P.M. 10: 147. J.H. 111.49:489. Of gar- 

 den origin. There are many allied forms of similar origin 

 described under different names. The name Azaleoden- 

 dron has been proposed as a generic name for the hybrids 

 between Azalea and Rhododendron by Rodigas. To 

 this group of hvbrids also belong R. Smithii aitreum, 

 Hort., with yellow fls. F.S.R. 2 : 152, and R. Broughtonii 

 aureum, Hort., similar, but with deeper yellow fls. and 

 with the under side of the Ivs. green, not glaucescent 

 as in the preceding form (G.C. III. 51:53); also R. 

 Cartonianum, DC., R. gemnriferum, Bean, and R. Go- 

 wenianum, Sweet (see suppl. list). 



found wild, but not yet in cult. The species is hardy, 

 but difficult to cult.; will probably succeed best on a 

 rockery in a cool and shady place. 



3387. Rhododendron 

 maximum. (XJa) 



Subgenus II. AZALEA. 

 Section 3. AZALEASTRUM. 



3386. Flower-bud of Rhododendron catawbiense. These buds are full- 

 formed in the fall. Unless these large terminal buds are produced, the 

 bush will not bloom the following spring. ( X K) 



Section 4. PENTANTHERA. 



A. Stamens longer than the limb; corolla- 

 tube long and narrow, usually glandu- 

 lar outside. 

 B. Color of fls. white or pink. 



c. Fls. with or after the Ins., white. 

 D. Corolla soft-pubescent outside, 

 with yellow stripes on the 

 upper lobe: branchlets gla- 

 brous or finely pubescent 30. occidentale 



DD. Corolla hirsute, with stalked 



glands. 

 E. Lrs. beneath and branchlets 



glabrous 31. arborescens 



EE. Lt-s. strigose beneath on the 

 midrib and branchlets stri- 

 gose 32. viscosum 



cc. Fls. before the Ivs., pink, rarely 



whitish. 

 j>. LTS. strigose beneath: corolla 



usually not glandular 33. nudiflorum 



DD. Lvs. grayish soft-pubescent be- 

 neath: corolla glandular out- 

 side 34. canescens 



BB. Color of fls. yellow to flame-red. 



c. Ovary not glandular; stamens 

 much longer than corolla: hs. 



generally obonate 35. calendula- 



CC. Cvary glandular; stamens little [ceum 



longer than corolla: ITS. generally 



oblong 36. luteum 



IA. Stamens shorter than the limb; corolla- 

 tube short, funnelform, finely pubes- 

 cent outside, not glandular. 

 B. Under side of Its. soft-pubescent: 



corolla yellow 37. sinense 



BB. Under side of Its. only strigose on the 



reins: corolla brick-red to carmine. . 38. japonicum 



29. albifldrum, Hook. (Azdka aUnflora, Kuntze. 

 Azaledstrum albifldrum, Rydb.). About 2-3 ft.: 

 branches strigose and glandular when young: Ivs. 

 oblong, pale green, appressed-strigose above and at the 

 midrib beneath, slightly ciliate: fls. nodding, on short 

 pedicels; corolla white, 5-cleft, about 1 in. broad; 

 calyx glandular; stamens 10. Rocky Mts. B.M. 3670. 

 Var. plenum, Rehd. A very handsome double form 



30. occidentale, Gray (Azalea oceidentalis, Torr. & 

 Gray. .4. calif ornica, Durand). Shrub, 2-6 ft.: 

 branchlets glabrous or pubescent: Ivs. obovate-oblong, 

 finely ciliate, slightly pubescent beneath when young, 

 1-2 in. long: corolla 2-2 % in. long, white or slightly 

 tinged rose, with yellow on the upper lobe, fragrant. 

 May. June. Calif. B.M. 5005. F.S. 14:1432. Gn. 

 34:416. G.W. 11, p. 8; 15, p. 650. 



