152; 



B. Corolhi 



thru: 



SB. Corollu 



RHODODENDRON 



hug or tu;ice 

 I; corolla lepi- 



EE. FIs. pale yellow 



CO. Lvs. deciduous or semi-per- 

 sistent: corolla not lepi- 

 dote outside: fls. very early 

 in spring from latera I l-fld. 

 buds at the . ' 



4. punctatum 



5. arbutiioUum 



6. myrtifolium 



7. Keiskei 



lirhi 



1. Califbrnicum, 1I<> 

 to 20 ft., glabrous: l\ 

 green beneatb, ^-G in. 

 the fls.: clusters iii 

 broadly campanulatc. 

 pie or pink, paler i" 

 ■within, about 2 in. ;i 

 mens 10, with purph 

 silky hairs. May, .In 

 Var. Washingtonianu 



18. mucronulatuin 



19. Dahuricum 



20. praecox 



. 8 ft. high, sometimes 

 limtly acuminate, pale 

 limes crowded beneath 

 :ilv\ minute ; corolla 

 ii.i,r,l lobes, rnsy pur- 



Catawbiense, 



10. Shrub, 6 ft. 

 . oval to oblong, 

 )us beneath, 3-5 

 usty pubescent: 

 roundish lobes, 



RHODODENDRON 



panulate 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 typical form. Var. Album, 

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

 riegated and one with purplish leaves. 



5. azaleoides. Desf. (R. frdgrans, Hort. R. odor&tum, 

 Hort.). Hybrid between R. Ponticum and Azalea «»- 

 diflortt. Shrill., .-1 few ft. high: Ivs. leathery but thin, 

 elliptic iM imiImm- , ;iiiiie at both ends, dark green above, 

 paler In i, ! , i im. s pubescent when young: fls. 

 funin-lt I M .1: |> li lie. pinkish or whitish, fragrant, 

 lJ^-2 ill. .1. I . , r,,l>v with ciliate lobes. May, .June. 

 — Of garden .iriKin. There are many allied forms of simi- 

 lar origin described under different names. The name 

 Azaleodendron has been proposed as a generic name for 

 the hybrids between Azalea and Rhododendron. 



6. arbdreum, Smith. Fig. 2112. -Large shrub or tree, 

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

 above, distinctly veined and whitish or ferrugineous- 

 toraentose beneath. 4-0 in. long: clusters dense, pedi- 

 cels short: e:ih\- iviiviiite; rnrnlla campanulate, blood- 

 red, pink or «l ■ ; " fitted, 1-lH in. across: 



ovarv ferniizi nesily, usually 7-9-celled. 



March-.Mav. II; I. 1;. 11:890. P.M. 1:101.- 



Var. Album'. DC. [J.-. ..',.,„, .--weet, not Blume). Pis. 

 white, spotted purple: Ivs. ferrugineous beneath. 

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

 slightly blushed, darker spotted than the preceding: 

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

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

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

 5311. Var. Kingi4num, Hook. (B. KingiAnum, Watt. i. 

 Slinib: Ivs. bro:ider, strimijly bullate, very dark: fls. 

 ill . [. ~e,.ii-li I ; i:i,ih'.i'i^ 'ii~i i"'.il'"'rrd ; ealyx larger. G.t^ 

 111 'i; ■■". \ .1! . Nil:i;:;-iinr.i. 1 ■l.irkr. I-'Is. rose-oolored 



...i.r:iii ' - lenuL'liieous bencath. 



l;,M 1,.-: i.ii ii. \ ,.; , lu.iiiceuni, I H'. Fls. purple 



ur :,c:n:el. l\ ... v.l.jle liene.ilL. \m. WindSCrU, VOSS 



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

 calvx with elongated lobes: Ivs. white beneath. 

 B.M. 5008. 



7. Cauc4slcum,Pall. Dense low .shrub, 2 ft. high, often 

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



in. long: clusters niiu: 



corolla broadly canipanil iii , 



lilac-purple, about Hi in. across: ovary rusty tomen- 



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



12:1170. — One of the most beautiful of native shrubs 



covering extensive tracts of land in the southern Alle 



ghanies. Hardy as far north as New England. 



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

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

 mostly acute at base, narrow-oblong or 

 lanceolate-oblong, ai-iiie or shortly acumi- 

 nate, whitish beneiiih. l-li> in. Iohl-: clus- 

 ters many-fld. ; pedii-eN \ i-,i,l : ralyx-lobes 

 oval, as long as ovary; lor.illa rauipuiiulate, 

 deeply 5-lobed with oval lohes, usually rose- 

 colored, spotted greenish within, about IK 

 in. across: ovary glandular. June, July. 

 N. S. and Onr. to Ga. B.M. 951. Em. 2:4.35. 

 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 

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

 purpiireum, Pursh {R. purpureum, Don), 

 with 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 

 from the woods. If properly hamlled and 

 taken from a turfy soil wiili a sntlicient ball of earth 

 around the roots, tiny are usually successfully trans- 

 planted. 



4. F6nticum, Linn. Slirub, 10 ft. high: Ivs. 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- 



These 1 



2109. Flower-bud of Rhododendron Catawbiense {X J^). 

 ids are full-formed in the fall. Unless these larse terminal buds are 

 produced, the bush will not bloom the following spring. 



elliptic, acute, dark green above, ferrugineous tomen- 

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

 short: calyx minute; corolla funnelform-canipanulate, 

 with emarginate rounded lobe.s, pink to yellowish white, 

 spotted greenish within, IK in. across. June, July. 

 Caucasus. B.M. 1145. -A dwarf, quite hardy species; 

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



