RHODODENDRON 



RHODODENDRON 



2939 



persistent, very short-petioled, oval to oval-oblong, 

 obtuse at both ends, revolute at the margin, ferrugin- 

 eous-lepidote beneath, %-lM in. long: fls. 1-3 at the 

 end of the branchlets; corolla rotate-funnelform, rose- 

 colored, 1 in. across; stamens about as long as lobes, 

 stvle longer. March, April. Siberia, N. China, Kam- 

 chatka. B.M.636. L.B.C. 7:605. G.C. II. 17:295; 

 III. 12:701; 53:51. Gn. 77, p. 18. G.W. 7, p. 415. 

 Var. sempervirens, Sims (var. atrovirens, Edw.). Lvs. 

 dark green, almost persistent: fls. violet-purple. B.M. 

 1888. B.R. 194. L.B.C. 16:1584. Gt. 53, pp. 267, 268. 

 R.H. 1908, p. 198. 



15. mucronulatum, Turcz. (R. dahuricum var. mu- 

 cronulatum, Maxim.). Fig. 3382. Upright shrub, 

 attaining 6 ft. : Ivs. elliptic to oblong, acute at both ends, 

 slightly crenulate, sparingly lepidote on both sides, 

 bright green above, pale beneath, 2-3 in. long: fls. 3-6, 

 short-pedicelled; corolla rotate-funnelform, divided to 

 the middle into oval rounded lobes, rose-colored, 1H 

 in. across. March, April. Manchuria, N. China, Korea, 

 Japan. G.F. 9: 65 (adapted in Fig. 3382). M.D. 1898:1. 



Rhododendron 

 arboreum. ( X K) 



B.M. 8304. Hardy shrub valuable for its very early 

 fls. (it is the earliest of all hardy rhododendrons) and 

 for its handsome scarlet fall coloring. 



16. jasminifldrum, Hook. Small shrub: Ivs. subver- 

 ticillate, obovate to oblong, acute, glabrous, lepidote 

 beneath, 1^-3 in. long: clusters many-fld.; pedicels 

 short; calyx minute; corolla almost salver-shaped, with 

 the tube 2 in. long and with spreading limb, fragrant, 

 white, blushed outside below the limb, the anthers 

 forming a red eye; style shorter than stamens, included. 

 Winter. Java/Malacca. B.M. 4524. I.H. 6:203. J.F. 

 1 :41. G. 32: 145. A distinct species, very unlike other 

 rhododendrons; it requires a warm greenhouse. 



Section 2. LEIORHODIUM. 



A. Under side of ITS. tomentose or pubes- 

 cent. 



B. Ovary tomentose: branchlets tomen- 

 tose or nearly glabrous. 

 c. Corolla distinctly campanulate; 

 lobes much shorter than tube; 

 pedicels about ^in. long: tall 

 shrub or tree, tender 17. arboreum 



CC. Corolla funnelform-campanulate; 



pedicels %-2 in. long. 

 D. Lvs. acute at both ends. ' 



E. Tomentum of Ivs. beneath and 

 of branchlets whitish or 



pale brown 18. Smirnovii 



EE. Tomentum of Its. beneath and 



of branchlets deep brown. 

 F. Corolla 6-lobed, spotted 



greenish 19. caucasicum 



FF. Corolla 67-lobed, spotted 



purple 20. Metternichii 



DD. Lvs. obtuse or obtusish at both 



ends 21. brachycarpum 



BB. Ovary and branchlets glabrous 22. campanula- 



AA. Under side of Ivs. glabrous or pubescent [turn 



only when young. 



B. Plants with coriaceous persistent Ivs. 



c. Ovary glabrous or glandular only. 



D. Pedicels puherulous; ovary 



glandular; stamens 10 23. ponticuin 



DD. Pedicels glabrous; ovary gla- 

 brous; stamens 13-15 24. sutchuenense 



cc. Ovary tomentose or pubescent. 

 D. Calyx-lobes much shorter than 



ovary. 

 E. Pubescence of ovary rusty 



hirsute: pedicels glabrous. . . 25. californicum 

 EE. Pubescence of ovary glandu- 

 lar; pedicels pubescent 26. catawbiense 



DD. Calyx-lobes nearly as long as 



ovary: Ivs. acute at both ends. . 27. maximum 

 BB. Plants with rather thin Ivs. falling 

 off the second spring: hybrids be- 

 tween this and the following section 28. azaleoides 



17. arbdreum, Smith. Fig. 3383. Large shrub or tree, 

 attaining 40 ft.: Ivs. oblong to lanceolate, acute, rugose 

 above, distinctly veined and whitish or ferrugineous- 

 tomentose beneath, 4-6 in. long: clusters dense; pedi- 

 cels short; calyx minute; corolla campanulate, blood- 

 red, pink, or white, usually spotted, 

 \-\Y-i in. across; ovary ferrugineous- 

 woolly or mealy, usually 7-9-celled. 

 March-May. Himalayas. B.R. 890. 

 P.M. 1:101. Gn. 64, p. 415. G.W. 

 6, p. 595. Var. album, DC. (R. album, 

 Sweet, not Blume) . Fls. white, spotted 

 purple: Ivs. ferrugineous beneath. G. 

 C. III. 29:246. Var. cinnamdmeum, 

 Lindl. Fls. white, slightly blushed, 

 darker spotted than the preceding: Ivs. 

 cinnamon-brown beneath. B.R. 1982. 

 Var. limbatum, Hook. Fls. with rosy 

 limb and white throat, blotched pur- 

 ple at base: Ivs. white beneath. B.M. 

 531 1 . Var. Kingiannm, Hook. (R. Kin- 

 ffianum, Watt). Shrub: Ivs. broader, 



strongly bullate, very dark: fls. deep scarlet; filaments 

 rose-colored; calyx larger. G.C. III. 26:306. B.M. 

 7696. Var. nilagiricum, Clarke. Fls. rose-colored to 

 deep crimson, spotted: Ivs. ferrugineous beneath. B.M. 

 4381. Gn. 36:54. Var. puniceum, DC. Fls. purple 

 or scarlet: Ivs. white beneath. Var. Windsor!!, Voss 

 (R. Windsorii, Nutt.). Fls. deep crimson-scarlet; calyx 

 with elongated lobes: Ivs. white beneath. B.M. 5008. 

 This species is tender and suited only for warmer tem- 

 perate regions, but has been crossed with hardy varie- 

 ties and its blood is recognizable in many of our 

 most beautiful hardy hybrids. 



18. Smirnovii, Trauty. Shrub or small tree, to 20*ft.: 

 young branchlets whitish or grayish woolly: Ivs. 

 elliptic-oblong, acutish, narrowed at the base into a 

 short petiole, revolute at the margin, dark green with 

 yellow midrib above, densely felted grayish white or 

 pale brown beneath, 3-5 in. long: fls. many, in a com- 

 pact head; calyx small, tomentose; corolla campanu- 

 late-funnelform, rosy red, 3 in. across; lobes oval, longer 

 than tube, with crisped darker rose-colored margin, 

 upper lip spotted brownish; stamens 10, curved; ovary 



