1702 



SPIRAEA 



Handsome bushy shrub, quite hardy; cult, under many 

 different names as /S. aquilegifdlia, adiantifdlia, cra- 

 tcegifolia, Bliimei. 



14. Van Houttei, Zabel (S. Cantoniinsis x trilobata. 

 S. aquilegifdlia, var. Van Houttei, Briot.). Fig. 2366. 

 Shrub, 6 ft. high, with arching branches : Jvs. rhom- 

 bic-ovate or rhombic-obovate, rounded or somewhat 

 narrowed at the base, acute, incised serrate, dark green 

 above to pale bluish green beneath, %-!% in. long: fls. 

 white, y% in. across, in many-fld. umbels; petals twice 

 as long as stamens; sepals upright or spreading in 

 fruit. May, June. Of garden origin. Gn. 53, p. 251. 

 G.F. 2:317. Gng. 5:210. A.G. 15:297. P.G. 3:173. 

 M.D.G. 1900:17. This is one of the most beautiful, or 

 perhaps the most beautiful, of the early-blooming 

 Spireas and quite hardy. Sometimes confounded with 

 the foregoing, which is similar but smaller in every 

 part and less showy. 



15. Cantoniensis, Lour. (S. Reevesiana, Lindl. S. 

 lanceolata, Poir. S. corymbbsa, Roxb. ). Shrub, 4 ft. 

 high, with slender, arching branches: Ivs.' rhombic- 

 lanceolate, incisely doubly serrate, dark green above, 

 pale bluish green beneath, 1-2% in. long: fls. over % in. 

 across, in rather dense umbels; sepals upright in fruit: 

 follicles with spreading styles. May, June. China, 

 Japan. B.R. 30:10. A.G. 18:356. -Very handsome 

 shrub, with large pure white fls., but only half-hardy 

 north. Var. fibre pleno, with double fls. and narrower 

 Ivs., is still more tender. This species and the three 

 foregoing are valuable also for their handsome foliage, 

 which remains fresh and green until late in fall. 



16. blanda, Zabel (S. Chinensis x Cantoniensis. S. 

 Reevesiana robusta, or ndva, Hort. ). Upright shrub, 6ft. 

 high, with arching branches : Ivs. oblong to ovate, acute 

 at both ends, incised serrate, dark green and almost 

 glabrous above, grayish tomentose beneath, 1-1% in. 

 long: fls. rather large, pure white, in pubescent umbels; 

 sepals ovate-lanceolate, upright in fruit: follicles pu- 

 bescent, with spreading styles. May, June. Of garden 

 origin. Only half-hardy north. 



17. Chjn6nsis, Maxim. (S.pubescens, Lindl.). Upright 

 shrub, fi ft. high, with arching branches, tomentose 

 when young: Ivs. long-petioled, ovate, incisely serrate 

 and sometimes 3-lobed, finely pubescent above, yellowish 

 tomen'/ose beneath, 1-2 in. long: fls. pure white, about 

 % in. across, in pubescent umbels ; sepals upright in 

 fruit, ovate-lanceolate, tomentose like the follicles; 

 styles terminal, spreading. May. China. B.R. 33:38. 

 Handsome, but not hardy north. 



18. pubescens, Turcz. Upright shrub, 6 ft. high, with 

 slender, arching branches: Ivs. similar to those of the 

 foregoing species, but more grayish tomentose beneath 

 and somewhat smaller, petioles shorter: fls. %-% in. 

 across, in glabrous umbels; sepals triangular-ovate, 

 upright in fruit: follicles glabrous, with the spreading 

 styles below the apex. May. N.China. G.F. 1:331. 

 Hardy north, and the large-fld. form as handsome as 

 the foregoing species. 



19. media, Schmidt (S. confusa, Regel & Kcern.). 

 Upright shrub, 5 ft. high, with terete branches, gla- 

 brous or pubescent when young: Ivs. ovate to oblong, 

 cuneate at the base, incisely serrate above the middle, 

 almost glabrous or pubescent, 1-2% in. long: fls. in 

 many-fld. rather long-stalked, umbel-like racemes ; fol- 

 licles with the spreading or reflexed styles somewhat 

 below the apex. May. S. E. Eu. to Japan. -Var. gla- 

 brescens, Zabel. Almost glabrous. Var. oblongifolia, 

 Rehd. {S. oblongifolia , Waldst. & Kit.). Lvs. elliptic- 

 oblong to oblong-lanceolate, narrowed at both ends, en- 

 tire or with 1-3 teeth at the apex. Var. sericea, Regel 

 (S. sericea, Turc/.). Lvs. pubescent on both sides. 



20. chamsedryfdlia, Linn. Shrub, 6 ft. high, with 

 angular, glabrous branches: Ivs. distinctly petioled, 

 ovate to lanceolate, sharply and often doubly serrate, 

 almost glabrous, bluish green beneath, 2-3 in. long: fls. 

 in many-fld. umbels, the lower ones long-stalked, the 

 upper ones often almost sessile: follicles with the styles 

 upright and terminal. S. E. Eu. to Japan. Var. flex- 

 udsa, Maxim. (S, flexubsa, Fisch.). Less high, with 

 spreading more or less zigzag branches: Ivs. narrower, 

 sharply serrate above the middle. Siberia to Dahuria. 



SPIR^A 



Var. ulmifdlia, Maxim. {S. iilmifdlia, Scop.). Upright: 

 Ivs. ovate, incisely or doubly serrate from below the 

 middle: fls. larger, about % in. across, appearing later. 

 L.B.C. 11:1042. B.R. 15:1222. Both vars. are often 

 cult.; they spread, like the preceding species, by 

 suckers. Sometimes as S. atrifolia or aubifolia in 

 gardens. 



SECTION 4. CALOSPIKA (Species Nos. 21-36). 

 A. Stamens as Jong as petals: Ivs. 

 small, %-l in. long: fls. white. 

 B. Height 3-6, occasionally 12 ft... 21. canescens 



BB. Height about % ft 22. decumbens 



AA. Stamens longer than petals. 



B. Corymbs on lateral branchlets 

 along the branches of the pre- 

 vious year. 

 C. Winter-buds slender, longer 



than petioles 23. longigemmie 



CC. Winter - buds shorter than 



petioles. 



D. Shoots angular: Ivs. usu- 

 ally broadly ovate 24. bella 



DD. Shoots terete : Ivs. usually 



ovate-lanceolate 25. expansa 



BB. Corymbs terminal on upright 



shoots of the year. 

 c. Inflorescence pubescent, 

 rarely glabrous, very com- 

 pound, besides the terminal 

 corymb lateral ones bloom- 

 ing somewhat later appear 

 beneath it. only we ale 

 branches with a single 

 corymb. 



D. Shrub 1 ft. or less high, 

 with bull ate Irs. less than 



1 in. long 26. bullata 



DD. Shrubs 1-5 ft. high, with 



larger Ivs. 

 E. Branches terete. 



F. Ripe follicles di- 

 verging 27. Japonica 



FF. Ripe follicles upright, 

 straight. 



G. Fls. pink 28. Margarita 



GG. Fls. whitish or 



blushed 29. Foxii 



EB. Branches more or less 

 angular, rather stiff, 

 almost glabrous. 

 F. Color of fls. pink, 



rarely whitish 30. Bumalda 



FF. Color of fls. white 31. albiflora 



CC. Inflorescence usually gla- 

 brous, consisting of only one 

 terminal corymb: follicles 

 not diverging. 

 D. Sepals reflexed in fruit: 



petals orbicular 32. superba 



DD. Sepals spreading or half 

 upright: petals oval to 

 oblong. 

 E. Fls. white. 



F. Corymb usually pu- 

 bescent 33. corymbosa 



FF. Corymb usually gla- 

 brous. 

 Q. Lvs . usually in - 



cised-serrate 34. lucida 



GG. Lvs. usually cre- 



nately serrate 35. betulifolia 



EE. Fls. pink 36. densiilora 



21. can6scens, D. Don. Shrub, 6 or sometimes 12 ft. 

 high, with spreading and arching branches: Ivs. broadly 

 oval to obovate, very short-petioled, crenately dentate 

 above the middle, grayish green, pubescent beneath or 

 sometimes almost glabrous at length, %-% in. long: 

 fls. white, rather small, in dense, semi-globose corymbs 

 to 2 in. across, appearing very profusely along the 

 branches; sepals upright or spreading in f r. : follicles 

 villous, with the ascending styles a little below the 



