SPIR.EA 



SPIRAEA 



3211 



B. Infl. pubescent, rarely glabrous, very 

 compound, besides the terminal 

 corymb lateral ones blooming some- 

 what later appear beneath it, only 

 weak branches with a single corymb, 

 c. Shrub 1 ft. or less high, with bullate 



hs. less than 1 in. long 30. bullata 



cc. Shrubs 1-5 ft. high, with larger hs. 

 D. Branches terete. 



E. Ripe follicles diverging 31. japonica 



EE. Ripe follicles upright, straight. 



F. Fls. pink 32. Margaritas 



FT. Fls. whitish or blushed 33. Foxii 



DD. Branches more or less angular, 



rather stiff, almost glabrous. 

 E. Color of fls. pink, rarely 



whitish 34. Bumalda 



EE. Color of fls. white 35. albiflora 



BB. Infl. consisting of only one terminal 

 corymb, usually glabrous: follicles 

 not direrging. 

 C. Corymbs usually pubescent. 



D. Sepals re flexed in fr.: hs. gen- 

 erally oblong, acute, or acumi- 

 nate: fls. pink or whitish 36. superba 



DD. Sepals upright in fr.: Ivs. gen- 

 erally ovate or oral: fls. white. .37. corymbosa 

 CC. Corymbs glabrous (often puberu- 

 lous in \o. 41)- 



D. Stamens longer than the petals. 

 E. Fls. pink; annular disk want- 

 ing 38. densiflora 



EE. Fls. white; disk present. 



F. Lrs. oblong, entire, or with 

 few teeth above the middle, 



acute 39. virginiana 



FF. LTS. oval or elliptic, 

 r toothed. 



G. Margin of hs. sharp- 

 ly, often doubly ser- 

 rate, apex acutish 40. lucida 



GG. Margin of hs. crenate- 

 dentate , apex 



rounded 41. betulifolia 



DD. Stamens as long as petals: de- 

 cumbent shrub: Ivs. %-l in. 

 long, sharply serrate 42. decumbens 



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

 high, with spreading and arching branches; branchlets 

 angled: Ivs. broadly oval to obovate, very short-petioled, 

 crenately dentate above the middle, grayish green, 



Eubescent beneath or sometimes almost glabrous at 

 ngth, ^-Min. long: fls. white, rather small, in 

 dense, semi-globose corymbs to 2 in. across, appear- 

 ing very profusely along the branches; stamens 

 about as long as petals; sepals upright or spread- 

 ing in fr.: follicles villous, with the ascending styles 

 a little below the apex. July. Himalayas. Gn. 45, 

 p. 49; 49, p. 421; 52, p. 28; 54, p. 48; 61, p. 380; 62, 

 p. 414. G.C. III. 43:90. Very graceful and hand- 

 some shrub, but not hardy N. It occurs under very 

 many different names in the gardens, as S. cuneata, 

 S. cuneifdlia, S. flagellata, S. flagettiformU, S. rotundi- 

 fblia, S. vaccinifolia, and others. Var. myrtif olia, Zabel 

 (S. argentea, Hort,). Lvs. dark green above, glauces- 

 cent and less pubescent below, narrower. M.D.G. 

 1906:385. 



22. Sargentiana, Rehd. Shrub, to 6 ft,, with slender 

 spreading branches; branchlets terete, puberulous at 

 first, soon glabrous: Ivs. elliptic-oblong to obovate- 

 oblong, narrowed into the petiole, with a few acute 

 teeth at the apex, rarely entire, puberulous above, vil- 

 lous beneath chiefly on the veins, \^-\ ip- long: corymbs 

 dense, 1-1% hi. across, villous: fls. white, J^in. across; 

 calyx villous; stamens about as long as petals: carpels 

 nearly glabrous. June. W. China. A very graceful 

 shrub, similar to S. canescens; has proved not quite 

 hardy at the Arnold Arboretum. 



23. Veitchii, Hemsl. Shrub, to 12 ft,, with spread- 

 ing and arching branches; branchlets puberulous while 



young, reddish, striped: Ivs. oval to oblong, rarely 

 obovate, obtuse, cuneate at the base, entire, finely 

 puberulous beneath and glaucescent, glabrous above, 

 %-l Yi in. long : corymbs 1 J^-2 % in. across, puberulous : 

 fls. Kin. across, white; calyx puberulous; stamens 

 longer than petals: carpels glabrous, upright, June, 

 July. B.M. 8383. J.H.S. 35, p. 152, fig. 98. G.M. 

 52:598. Like the two following closely allied species 

 very handsome and hardy as far north as Mass. 



24. Wflsonii, Duthie. Shrub, to 8 ft., with arching 

 branches; branchlets dull purplish, pubescent while 

 young: Ivs. very short-petioled, oval to oblong or obo- 

 vate, obtuse or acutish, cuneate at the base, entire or 

 with a few coarse teeth at the apex, dull green and 

 pubescent above, grayish green and villous beneath, 

 particularly on the veins, %-2J4 m - long: corymbs 

 dense, lJ^-2 in. across, glabrous or nearly so: fls. J^in. 

 across, pure white; calyx glabrous: follicles sparingly 

 pilose, slightly spreading. June. Cent, and W. China. 

 B.M. 8390. G. 35:851. 



25. Henryi, Hemsl. Fig. 3665. Shrub, to 8 ft., with 

 spreading branches; branchlets sparingly pilose or 

 nearly glabrous: Ivs. obovate or oblong to oblanceolate, 

 cuneate at the base, acute or rounded at the apex, 

 usually coarsely dentate 



toward the apex, slightly 

 hairy above, villous beneath 

 particularly on the veins, 

 %-3 in. long; petiole K~ 

 Min. long: corymb 2 in. 

 across, rather loose, pilose: 

 fls. M m - across; stamens 

 shorter than petals: follicles 

 hairy, slightly spreading. 

 June. Cent, and W. China. 

 B.M. 8270. Gn. 65, p. 44. 

 J.H.S. 28:62, fig. 20. G. 

 37:35. Var. notibilis, Far- 

 quhar. Corymbs larger. 



26. RSsthornii, Pritz. (S. 

 Prdttii, Schneid.). Shrub, 

 to 6 ft., with spreading 

 branches ; branchlets yellow- 

 ish brown, sparingly hairy 

 while young: winter buds 

 elongated, long-pointed, 

 often as long as petiole: Ivs. 

 ovate to ovate-oblong, acu- 

 minate, cuneate at the base, 

 rarely nearly rounded, 

 incisely serrate, bright 

 green, hairy on the veins 

 beneath, 1^-3 in. long; 

 petioles J-Hin. long: 



3665. Spiraea Hemyi. 



corymbs rather loose, 2-3 in. across, pilose, on elon- 

 gated branchlets: fls. J^in. across, white, stamens longer 

 than petals. June. W. China. A graceful shrub with 

 handsome bright green foliage. 



27. longigemmis, Maxim. Fig. 3666. Shrub, 4 ft. 

 high, with slender terete branches, glabrous: axillary 

 buds acuminate, longer than the petioles: Ivs. ovate- 

 lanceolate to oblong-lanceolate, incisely and doubly 

 serrate, with glandular-tipped teeth, bright green, gla- 

 brous, 1J^-2H hi. long: fls. white hi rather loose 2-3-in. 

 broad pubescent corymbs; sepals spreading in fr.: fol- 

 licles almost glabrous, with terminal spreading styles 

 June. N.W.China. G.F. 7:345 (adapted in Fig. 3666). 

 I.T. 5:92. G. 34:443. Hardy. 



28. bella, Suns (S. expdnsa, Wall. S. ovata, and S. 

 cdccinea, Hort.). Shrub, 3 ft. high, with slender, spread- 

 ing branches, angular and sparingly pubescent: Ivs. 

 ovate-elliptic to ovate-lanceolate, acute at both ends, 

 sharply serrate from below the middle, almost glabrous, 

 whitish or bluish green beneath, 1-2 in. long: fls. 

 dioecious, K m - across, pink, in small corymbs, Yr-1 in. 



