31. albifl6ra, Miq. (S. Jap6ni 



or little divergiiifj. July, Aug. Japan. 



32. Bupfirba, Zabel {S. albifldra x corymbdsa). Low 

 shrub, with striped dark brown branches: Ivs. elliptic- 

 oblong to oblong, acute at both ends, simply or doubly 

 serrate, almost glabrous, 1-3 in. long: fls. rather large, 

 pink or almost whitish; disk prominent; petals orbicu- 

 lar or broadly obovate. June, July. Of garden origin. 



SPIR^A 



in. across. June, July. Siberia to Manchuria, Kams- 

 chatka and Japan. — The two preceding and the follow- 

 ing "iienies are all closely allied and considered by 

 ^...ll,• iH.taiiists as varieties of A'. betulifoUa. 



:;ii rtensiflbra, Nutt. {S. betulifdlia, var.rdsea. Gray. 

 v. /.../. Koehne. S. arbiiscnla, Greene). Low, much- 

 braiiclicU shrub: Ivs. very short-petioled, oval to ovate, 

 obtuse, crenately serrate, H-1}4 in. long: fis. bright 

 pink, in dense corymbs 1-2 in. across. June-Aug. Ore. 

 to Calif., .southern Manchuria. G.P. 10:413. 



Section 5. Spirabia (Species Nos. 37-19). 

 A. Inflorescence a broad panicle, 

 about as broad as high. (Hybrids 

 of species of this and the preced- 

 ing section.) 

 B. Panicles rather small, on lateral 

 branchlefs at the end of last 



C. I.r .'■■.' „, „,■/,/ KO. 



I). .1; ':..,,.,,/, :iN. conspicua 



I>D. Ajjcj- of Ivs. obtuse or 

 acuti.*ih. 

 E. Shape of Ivs. broadly 



ovate or obovate 3i). notha 



EE. Shape of Ivs. oblong or 



oval-oblong 4ii. pyramidata 



cc. I/vs, pubescent or tomentost- 

 beneath. 



D. Birsv nf Im. nrnfr 41. Sanssouciana 



Dn. Ii'tse i,f Irs. ,;>i,,nl,'il VI. Nobleana 



Panirh-r. , l,.,n,,,l..l . I..,,,;,,- Ih,u, 



hrna.l. [S,,i, :,,■,„ pr..,,. ..i 

 B. F„li„„. ,il<,l.,„„s ..r „..n-hi sn. 



.■!3. corymbdsa, Raf. [S. cratmgifdlia, Link.). Low 

 shrub, with usually little-branched stems, rarely to 3 

 ft. high: l.raTirlH-- P'lrpti-li lirn-v,,: lv«. l.n.:„llv ..v:,l tn 



I .styles upright. May, 

 ullied to the former: 



looser and more flat, broader. .Inn. i'. h 



Brit. Col. and Oregon. The .-il;. ' s \'i . : mi i n.;, 

 Britt., is more brauclipcl and highn-: l>-, ,.l,l,.n- i., ,.i. 

 lanceolate, (initiiif altcvi- the midille or almost entire: 

 infloresi'enre ulaliinus. Va. to N. C. B.B. 2:197. 



35. betulifdlia, I'lMI. Low, much-branched shrub: Ivs. 

 oval to ..iH.v.iie ,.!■ .jliovate-oblong, usually cuneate at 

 base and very short-petioled. serrate or crenately ser- 

 rate, obtuse, glabrous or slightly pubescent on the veins 

 beneath, 'A-iyi in. long: corymb usually glabrous, 1-2 



the fls. pink. 



3S. conspicua, Zabel IS. albiftdra ^ r!Um]. Upright 



S. semperflorens, Zaliel ( ,S'. ,Tiip('iiiir,i ..,,,.,1..;.,,, s'. 

 Japdnicti or Fth'tunei, var. paniculdta, Hnrt.). Hii;lier 

 than the former: Ivs. oblong-lanceolate, usually doubly 

 serrate: fls. pink. R.H. 1860, p. 496, 497. Gn. 4.'), p. 48. 



