1704 



SPIR.EA 



SPIR.EA 



31. albifl6ra, Miq. (S. Japdnica alba, Regel. S. leu- 

 cdntha, Lange). Pig. 2367. Low shrub, \ l A ft. high, 

 with stiff, upright branches: lvs. 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. superba, Zabel [8. albifldra x corymbbsa). Low 

 shrub, with striped dark brown branches: lvs. 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 albiflora ( X %) . 



33. corymbdsa, Raf. (S. cratcegifblia, Link.). Low 

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

 ft. high: branches purplish brown: lvs. 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. toGa. L. B.C. 7:671. 



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

 branches yellowish brown or brown: lvs. 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: lvs. 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: lvs. 

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



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 6". betulifolia. 



36. densiflora, Nutt. (S. betulifdlia, var. rdsea, Gray. 

 S. rdsea, Koehne. S. arbiiscula, Greene). Low, much- 

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

 obtuse, crenately serrate, %-\ x A in. long: fls. bright 

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

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



Section 5. Spiraria (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 

 bra nch lets at the end of last 



year's branches 37. Fontenaysii 



EB. Panicles large, terminal on long, 

 upright branches. 

 0. Lvs. glabrous ar nearly so. 



D. Apex of ics. ami, 38. conspicua 



DD. Apex of lvs. obtuse or 

 acutish. 

 E. Shape of lvs. broadly 



ovate or obovate 39. not ha 



ee. Shape of lvs. oblong or 



oval-oblong 40. pyramidata 



CO. Lvs. pubescent or tomentose 

 beneath. 



D. Base of lvs. acute 41. Sanssouciana 



dd. Base of lvs. rounded 42. Nobleana 



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. salicifolia 



ee. Fls. white 44. alba 



dd. Panicles glabrous 45. latiiolia 



CO. Lvs. coarsely serrate above 



the middle: fls. pink 46. Menziesii 



BB. Foliage pubescent or tomentose 

 beneath. 

 c. Follicles glabrous: lvs. gray- 

 ish or whitish tomentose be- 

 neath. 



D. Lvs. acute at both ends 47. Billardii 



dd. Lvs. rounded or nearly so 



at both ends 48. Douglasi 



CC. Follicles pubescent: lvs. usu- 

 ally light tawny beneath. 49. tomentosa 



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

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

 der, upright branches: lvs. 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. rdsea, Zabel, the 

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

 Lange. S. luxuridsa, Hort. S. cane'scens x Douglasi), 

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

 the fls. pink. 



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

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

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

 serrate, almost glabrous, l/i-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 lvs. serrate 

 above the middle and pink fls. Closely allied is also 

 S. semperildrens, Zabel (S. Japdniea x salicifolia, S. 

 Japdniea or Fdrtnnei, var. paniculata, Hort.). Higher 

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

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



