11. jaBminiflorum 



a22 RHODODENDRON 



A. Foliage lepidote or (jlnnrjulnr, 

 rarely more than 3 in, long: 

 ovary lepidote. LepidorhoiJium. 

 B. Corolla with cylindric ' ' 

 thrice as long as lobes. 

 BB. Corolla campanulate or funnel- 

 form; lohes as long or twice 

 as long as tube. 

 C. Lvs. persistent; corolla lepi- 

 dote outside. 

 D. Style hardly twice as long 

 as ovary f shorter than 

 stamens: lvs. often 

 .tJit/htJif rrevulnte. 

 E. 'I'll'' Irx. ii-iiliiiiit hairs.i2. (errugrineum 



EE. 'I'/i. Irx. rilullr U. llirSUtUm 



E. Fls. pink or whitr U. punctatum 



15. arbutifolium 

 Hi. myrtifolium 

 EE. Fls. pah- iirllnw 17. Keiskei 



CO. Xl'.^.y-.:.; ..'■■,■ :<.„n-i>.r^ 



./..' . ... ,-.( . ,irlil 

 in ,.,., .,../ .'...,„ ;..,'. r.tl 1-lld. 

 bu.lj ut !h, I ndi uf 

 branches 18. mucTonulatum 



19. Dahuricum 



20. praecox 



1. Calif6niicum, Hook. Shrub, 8 ft. liii.'h, soniftimos 

 to 20 ft., glabrous: lvs. oblong, shortly :n'uiiiiiiatf, pak; 

 green beneath, 3-C in. long, sometimes immwcIc d licm-atli 

 the lis.: clusters many-fld. ; calyx niiiiutr ; lurolla 

 broadly campanulate, with oval crisped lubes, rosy pur- 

 ple or pink, paler towards the center, spotted yellow 

 ■within, about 2 in. across, rich carmine in bud; sta- 

 mens 10, with purple anthers: ovary with appressed 

 silky hairs. May, June. Calif, to Ore. B.M. 4863.- 

 Var. WashingtoniAnum, Zabel (B. Washingtonianum 

 and probably B. Californicum, var. maximum, Hort.), 

 is not much different, but has yellow anthers; it has 

 proved as hardy as B. Catatvbiense. 



2. CatawbiSnse, Pursh. Figs. 2109, 2110. Shrub, 6 ft. 

 high, rarely 20 ft. : lvs. rounded at base, oval to oblong, 

 usually obtuse and mucronulate, glaucous beneath, 3-5 

 in. long: clusters many-fld.; pedicels rusty pubescent: 

 corolla broadly campanulate, with broad roundish lobes, 

 lilac-purple, about I'A in. across : ovary rusty tomen- 

 tose. June. Va. to Ga., in the mts. B.M. 1671. L.B.C. 

 12:1176. -One of the most beautiful of native shrubs, 

 covering extensive tracts of land in the southern AUe- 

 ghauies. Hardy as far north as New England, 



3. mixiinum, Linn. Great Laurel. Fig. 2111. 

 Shrub or small tree, attaining 35 ft.: lvs. 



mostly aciitf 

 lanceolate-ob 

 nate, whiti^l 



narrow-oblong or 



in. long: clus- 

 ters many-fhl. ; |.i.ii<..i- \i-cid: calyx-lobes 

 «val, as loiiK a.- ..\ar\ ; ..it ..I la campanulate, 

 deeply S-lobedwith oval lol>es, usiially rose- 

 colored, spotted greenish within, about IK 

 in. across: ovary glandular. June, July, 

 N. S. and Ont. to Ga. B.M. 951. Em. 2:435. 

 Mn. 1:1 and 3, p. 22. D. 16. -This is one of 

 the hardiest species, being hardy as far 

 north as Quebec and Ontario. Three vars. 

 have been distinguished : var. Album, Pursh 

 (B. Purshii, Don), with white fls.; var. 

 purpureum, Pursh (B. purpiirenm, Don), 

 witli purple fls., and var. rdseum, Pursh, 

 with pink flowers. This species and the 

 former are now often extensively used in 

 park-planting and taken by the car-loads 

 ^rom the woods. If proi)erly handled and 

 taken from a turfy soil with a sufScient ball of earth 

 a.round the roots, they are usually successfully trans- 

 planted. 



4. Pbnticum, Linn. Shrub, 10 ft. high: lvs. elliptic 

 to oblong, acute, pale green beneath, 3-5 in. long: clus- 

 ters many-fld. ; pedicels longer than fls. : calyx-lobes as 

 long as ovary, the lower ones half as long; corolla cam- 



RHODODENDRON 



pauulate with oval lobes, purple, spotted brownish with- 

 in, about 2 in. across: ovary glandular. May, June. 

 Spain, Portugal, Asia Minor. B.M. 650.-This species 

 is less hardy than the two preceding and now rarely 

 found in cultivation in its tvpical form. Var. Album, 

 Hort., has white flowers. There are also vars. with va- 

 riegated and one with purplish leaves. 



5. azaleoldes, Desf. (J?, frdgrans, Hort. B. odor&tum, 

 Hort.). Hybrid between B. Ponticum and A2ulea nu- 

 diflora. Shrub, a few ft. high: lvs. leathery but thin, 

 elliptic to oblong, acute at both ends, dark green above, 

 paler beneath, sometimes pubescent when young: fls. 

 funnelform-campanulatp, pinkish or whitish, fragrant, 

 IV2-2 in. across: rvilvT -.vitli filiate lobes. May, June. 

 • ■.' tiiaiiy allied forms of simi- 

 n-ut names. The name 

 ; , id as a generic name for 

 :,ii._j. :iii._l Khodo'dendron. 



— Of garden ori 

 lar origin desc 

 Azaleodendroii 

 the hybrids bel 

 6. arbftreum, 

 attaining 40 ft. : 



1. Fig, 2112. Large shrub or tree, 

 oblong to lanceolate, acute, rugose 

 above, distinctly veined and whitish or ferrugineous- 

 tomentose beneath, 4-6 in. long: cluster.s dense, pedi- 

 cels short: calyx minute; corolla campanulate, blood- 

 red, pink or white, usually spotted, 1-1 K in. across: 

 ovary ferrugineous-woolly or mealy, usually 7-9-celled. 

 March-May. Himalayas. B.R. 11:890. P.M. 1:101.- 

 Var. Album, DC. {B. album, Sweet, not Blume). Fls. 

 white, spotted purple: lvs. ferrugineous beneath. 

 S.B.F.G. 5:148. Var. oinnamdmeum, Lindl. Fls. white, 

 slightly blushed, darker spotted than the preceding: 

 lvs. cinnamon-brown beneath. B.R. 23:1982. Var. lim- 

 bAtum, Hook. Fls. with rosy limb and white throat, 

 blotched purple at base: lvs. white beneath. B.M. 

 5311. Var. Kingiinum, Hook. {B. Kingieinum, Watt.). 

 Shrub: lvs. broader, strongly bullate, very dark: fls. 

 deep scarlet; filaments rose-colored; calyx larger. G.C. 

 111.26:306. Var. Nilaglrioum, Clarke. Fls. rose-colored 

 to deep crimson, spotted: lvs. ferrugineous beneath. 

 B.M.4381. Gn. 36:710. Var. punlceum, DC. Fls. purple 

 or scarlet: lvs. white beneath. Var. Windsorii, Voss 

 {B. Windsorii, Nutt. ). Fls. deep crimson-scarlet; 

 calyx with elongated lobes: lvs. white beneath. 

 B.M. 5008. 



7. CaucAsicum, Pall. Dense low shrub, 2 ft. high, often 

 with procumbent branches: lvs. oval-oblong or narrow- 



2109. Flower-bud of Rhododendron Catawbiense 

 These buds are full formed in the fall. Unless these large terminal buds i 

 produced, the bush will not bloom the following spring. 



elliptic, acute, dark green above, ferrugineous tomen- 

 tose beneath, 2-4 in. long: clusters 7-10-fld. ; pedicels 

 short: calyx iiiinutr; corolla funnelform-cauipanulate, 

 with ciiiai -iiK.t. KMiii.lr.l lobes, pink to yellowish white, 

 spotted t;rci iiisl. wiihin, \\i in. across. June, July. 

 Caucasus. B..^I. IH."). — A dwarf, quite hardy species; 

 late-flowering. Var. fl4vidum, Regel. Fls. straw-col- 



