1704 



SPIRAEA 



31 albifldra, Miq. (S. Japonica alba, Regel. S leu- 

 cdnt'ha, Lange). Fig. 23G7. Low shrub, 1% ft, high, 

 with stiff, upright branches: Ivs. lanceolate, coarsely 

 or sometimes doubly serrate, glabrous, 1-2 in. long: fls. 

 white, in dense corymbs, one large terminal and many 

 smaller ones below, forming a kind of raceme; disk 

 prominent; sepals reflexed in fr. : follicles upright, not 

 or little diverging. July, Aug. Japan. 



32. sup&rba, 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. 



2367. Spiraea albiflura (X%). 



33. corymb6sa, Raf. (S. cratcegifdlia, Link.). Low 

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

 ft. high: branches purplish brown: Ivs. broadly oval to 

 ovate, acutish, coarsely and often doubly serrate, espe- 

 cially above the middle, pale bluish green beneath and 

 glabrous, l%-3 in. long: fls. white, rather small, in 

 somewhat convex usually pubescent corymbs, l%-3 in. 

 across; petals oval: follicles and styles upright. May, 

 June. N. J. to Ga. L.B.C. 7:671. 



34. lucida, Dougl. Closely allied to the former: 

 branches yellowish brown or brown: Ivs. more incisely 

 serrate, oval or obovate: corymb glabrous, usually 

 looser and more flat, broader. June, July. Dakota to 

 Brit. Col. and Oregon. The allied S. Virginiana, 

 Britt., is more branched and higher: Ivs. oblong to ob- 

 lanceolate, dentate above the middle or almost entire: 

 inflorescence glabrous. Va. to N. C. B.B. 2:197. 



35. betulifdlia, Pall. Low, much-branched shrub: Ivs. 

 oval to obovate or obovate-oblong, usually cuneate at 

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

 rate, obtuse, glabrous or slightly pubescent on the veins 

 beneath, %-!% in. long: corymb usually glabrous, 1-2 



SPIR.EA 



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

 chatka and Japan. The two preceding and the follow- 

 ing species are all closely allied and considered by 

 some botanists as varieties of S. betulifolia. 



36. densifldra, Nutt. (S. betulifdlia, var. rosea, Gray. 

 S. rosea, Koehne. S. arbuscula, Greene). Low, much- 

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

 obtuse, crenately serrate, %-!% in. long: fls. bright 

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

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



SECTION 5. SPIRABIA (Species Nos. 37-49). 



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 

 branchlets at the end of last 



year's branches 37. 



BB. Panicles large, terminal on long, 



upright branches. 

 C. Lvs. glabrous or nearly so. 



D. Apex of Ivs. acute 38. 



1>D. Apex of Ivs. obtuse or 



acutish. 

 E. Shape of Ivs. broadly 



ovate or obovate 39. 



EE. Shape of Ivs. oblong or 



oval-oblong .- 40. 



CO. Lvs. pubescent or tomentose 

 beneath. 



D. Base of Ivs. acute 41. 



DD. Base of Ivs. rounded 42. 



AA. Panicles elongated, longer than 



broad. ( Spiraria proper. } 

 B. Foliage glabrous or nearly so. 

 C. Lvs. sharply serrate, except 



at the very base. 

 D. Panicles tomentulose. 



E. fls. light pink 43. 



EE. Fls. white 44. 



DD. Panicles glabrous 45. 



CC. Lvs. coarsely serrate above 



the middle: fls. pink 46. 



BB. Foliage pubescent or tomentose 



beneath. 



C. Follicles glabrous: Ivs. gray- 

 ish or whitish tomentose be- 

 neath. 



D. Lvs. acute at both ends 47. 



DD. Lvs. rounded or nearly so 



at both ends 48. 



CC. Follicles pubescent: Ivs. usu- 

 ally light tawny beneath .49. 



Fontenaysii 



conspicua 



notha 

 pyramidata 



Sanssouciana 



Nobleana 



salicifolia 

 alba 



latifolia 



Meuziesii 



Billardii 

 Douglas! 



tomentosa 



37. Fontenaysii, Billard (S. Fontanaysiensis, Dipp. 

 S. canescens x salicifolia). Shrub, 6 ft. high, with slen- 

 der, upright branches : Ivs. oval or oblong-oval, rounded 

 at both ends, crenately serrate above the middle, pale 

 bluish green beneath, almost glabrous, 1-2 in. long: fls. 

 white or pink, in 1%-3-in. long panicles; petals orbicu- 

 lar, about as long as stamens; sepals spreading in fruit. 

 June, July. Of garden origin. Not quite hardy north. 

 Var. alba, Zabel, is the white-fld., var. rosea, Zabel, the 

 pink-fld. form. S. pruindsa, Hort. (S. brachybdtrys, 

 Lange. S. luxuridsa, Hort. S. canescens x Douglasi), 

 is a similar form, but the Ivs. are tomentose beneath and 

 the fls. pink. 



38. conspicua, Zabel (S. albifldra x dlba). Upright 

 shrub, 3 ft. high, with dark brown puberulous branches: 

 Ivs. elliptic-oblong, acute at both ends, simply or doubly 

 serrate, almost glabrous, l%-2% in. long: fls. pinkish 

 white, in broad finely pubescent panicles; petals shorter 

 than stamens. July-Sept. Handsome form. A similar 

 hybrid is S. syringaefldra, Lem. (L. albifldra x salici- 

 fdlia), with oblong-lanceolate or lanceolate Ivs. serrate 

 above the middle and pink fls. Closely allied is also 

 S. semperfldrens, Zabel {S. Jap6nica x salicifolia, S. 

 Japdnica or Fdrtunei, var. paniculdta, Hort.). Higher 

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

 serrate: fls. pink. R.H. 1860, p. 496, 497. Gn. 45, p. 48. 



