3210 



SPIRAEA 



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

 across, in rather dense umbels; sepals upright in fr.: 

 follicles with spreading styles. May, June. China, 

 Japan. B.R. 30:10. A.G. 18:356. G. 34:441. Very 

 handsome shrub, with large pure white fls., but only 

 half-hardy N. Var. lanceata, Zabel (S. Reevesiana 

 flore-pleno, Hort.), with double fls. and narrower Ivs. is 

 still more tender. H.F. 1855:11. This species and the 

 three foregoing are valuable also for their handsome 

 foliage, which remains fresh and green until late in fall. 



15. blanda, Zabel (S. cMnensis x S. cantoniensis. S. 

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

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

 at both ends, incised-serrate, dark green and almost 

 glabrous above, grayish-tomentose beneath, 1-1M in- 

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

 sepals ovate-lanceolate, upright in fr. : follicles pubes- 

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

 origin. Only half-hardy North. 



16. chinensis, Maxim. (S. pubescens, Lindl.). Upright 

 shrub, 5 ft. high, with arching branches, tomentose 

 when young: lys. long-petioled, ovate, incisely ser- 

 rate and sometimes 3-lobed, finely pubescent above, 

 yellowish tomentose beneath, 1-2 in. long: fls. pure 

 white, about J^in. across, in pubescent umbels; sepals 

 upright in fr., ovate-lanceolate, tomentose like the fol- 

 licles; styles terminal, spreading. May. China. B.R. 

 33:38. Handsome, but not hardy North. 



17. 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. J^-^iin. 

 across, in glabrous umbels; sepals triangular-ovate, 

 upright in fr. : follicles glabrous, with the spreading 

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

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

 foregoing species. 



18. media, Schmidt (S. confusa, Regel & Koern.). 

 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. J.H. III. 

 46:533. G. 30:45. G.M. 49:504. R.F.G. 24:149. 

 Var. glabrescens, Simonkai. Almost glabrous. Var 

 subintegerrima, Zabel (S. oblongifolia, Waldst. & Kit.). 

 Lvs. elliptic-oblong to oblong-lanceolate, narrowed at 



3664. Spiraea Vanhouttei. 



both ends, entire or with 1-3 teeth at the apex, nearly 

 glabrous. Var. sericea, Regel (S. sericea, Turcz.). Lvs. 

 pubescent on both sides. 



19. chamaedryfdlia, Linn. Shrub, to 6 ft., with 

 angular glabrous branchlets: Ivs. slender-petioled, ovate, 

 incisely or doubly serrate from below the middle, 

 almost glabrous, 



bluish green 

 beneath, 1 J^-3 in. 

 long: umbels 

 many-fld., the 

 lower ones on 

 branchlets about 

 2 in. long, the 

 upper ones often 

 almost sessile ; fls. 

 about J^in. across: 

 follicles with the 

 style upright and 

 terminal. May, 

 June. S. E. Eu.to 

 Japan. G. W. H. 

 83. Var. ulmifdlia, Maxim. (S. ulmifdlia, Scop.). Lvs. 

 more rounded at the base : umbels more elongated-hemi- 

 spherical. S. E. Eu. R.F.G. 24:150. Var. transiens, 

 Zabel. Lvs. narrower, oblong-ovate. This and the 

 preceding species spread by suckers. 



20. flexudsa, Fisch. (S. chamsedry folia var. flexuosa, 

 Maxim.). Similar to the preceding species, but lower 

 and more spreading: branchlets slender, strongly 

 angled, distinctly zigzag: Ivs. oblong-ovate to lance- 

 oblong, cuneate at the base, usually serrate above the 

 middle only, 1-2 in. long: umbels few-fld., short-stalked. 

 May, June. N. E. Asia. Var. stenophylla, Schneid. 

 (S. chamsedryfolia var. stenophylla, Zabel). Lvs. smaller 

 and narrower, usually less than 1 in. long. 



Section II. CALOSPIHA. Species Nos. 21-42. 



A. Corymbs on usually short lateral 

 branchlets along the mostly arching 

 branches of the previous year. 

 B. Lvs. y%-l in. long, crenate-serrate, or 

 serrate only at the apex: corymbs on 

 very short branchlets. 

 c. Branchlets angular: Ivs. generally 

 oval, obtuse: winter buds with 2 



outer scales 21. canescens 



cc. Branchlets terete: Ivs. generally 

 oblong: winter buds with several 



scales 22. Sargentiana 



BB. Lvs. %-3 in. long, 

 c. Fls. perfect, white. 



D. Winter buds short, ovate, with 

 several outer scales: Ivs. entire 

 or dentate only above the 

 middle. 



E. Upper surface of Ivs. gla- 

 brous; margin entire: flower- 

 ing branchlets 2-3 in. long. . 23. Veitchii 

 EE. Upper surface of Ivs. more or 

 less pubescent, margin usu- 

 ally dentate toward the apex. 



F. Infl. glabrous 24. Wilsonii 



FF. Infl. pilose 25. Henryi 



DD. Winter buds elongated, pointed, 

 with 2 outer scales: Ivs. doubly 

 or incisely serrate. 

 E. Foliage pubescent on the 



veins below, incisely serrate.2Q. Rosthornii 

 EE. Foliage glabrous, Ivs. deeply 



serrate 27. longigemmis 



cc. Fls. dioecious, pink or white: Ivs. 

 sharply serrate: winter buds 

 ovate, with several scales. 

 D. Shoot angular: Ivs. usually ovate- 

 oblong: fls. pink 28. bella 



DD. Shoot terete: Ivs. usually ovate 



to elliptic: fls. white 29. ezpansa 



AA. Corymbs terminal on upright shoots of 

 the year. 



