SPIRAEA 



SPIRAEA 



3213 



dense corymbs and rather narrow, incisely serrate Ivs. 

 Gn. 45:49. G.C. III. 14:365; and var. FroSbeli, Hort. 

 (S. cattdsa var. Froebeli, Hort.), a taller plant with 

 broader, ovate-oblong Ivs. and also with bright crimson 

 fls. F.E. 31 : 604. A similar form is S. Lemdinei, Zabel 

 (S. Bumdlda var. ruberrima, Hort.), hybrid of S. 

 Bumalda and S. buttata, a low, compact shrub, with 

 somewhat bullate Ivs. and pink fls. 



3668. Spiraea latifolia. ( X H) 



35. albifldra, Miq. (S. japonica alba, Regel. S. leu- 

 cdntha, Lange). Fig. 3667. Low shrub, \Y^ 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 along the branch; disk prominent; 

 sepals reflexed in fr.: follicles upright, not or little 

 diverging. July, Aug. Japan. 



36. superba, Zabel (S. albifldra x S. 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. 



37. corymbdsa, Raf. (S. cratxgifblia, Link). Low 

 shrub, with usually little-branched sts., 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, 1^-3 in. long: fls. white, rather small, in 

 somewhat convex usually pubescent corymbs, lJ^-3 in. 

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

 June. N. J. to Ga. and Ky. L.B.C. 7:671. G.O.H. 82. 

 B.B. (ed. 2)2:246. 



38. densiflfira, Nutt. (S. betulifdlia var. rbsea, Gray. 

 S. splendens, Baumann. S. rdsea, Koehne. S. arbiis- 

 cula, Greene). Low, much-branched shrub: Ivs. very 

 short-petioled, oval to ovate, obtuse, crenately ser- 

 rate, glabrous, rarely sparingly puberulous beneath, 

 %-l% in. long: fls. bright pink, in dense corymbs 1-2 

 in. across. June-Aug. Brit. Col. to Ore., Wyo., and 

 Mont. G.F. 10:413. 



39. virginiana, Brit. Much-branched shrub, to 4 ft., 

 glabrous: Ivs. lance-oblong, acute, cuneate or rounded at 

 the base, entire or with a few teeth above the middle, 

 pale or glaucescent beneath, 1)^-2 in. long: fls. white, 

 in dense glabrous corymbs, about 2 in. across. June. 

 Va. to N. C. and Term. B.B. (ed. 2) 2:246. 



40. lucida, Douglas (S, corymbdsa var. liicida, 

 Zabel). Closely allied to S. corymbosa: branches yellow- 

 ish brown or brown: Ivs. more incisely serrate, oval or 

 obovate: corymb glabrous, usually looser and more flat, 

 broader. June, July. Brit. Col. to Sask., Wyo. and Ore. 



41. betulifdlia, Pall. Low, much-branched shrub: 

 Ivs. oval to obovate-oblong, usually cuneate at base 

 and very short-petioled, serrate or crenately serrate, 

 obtuse, glabrous or slightly pubescent on the veins 

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

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

 chatka and Japan. The three preceding species except 

 S. virginiana, are all closely allied and considered by 

 some botanists varieties of S. betidifolia. 



42. decumbens, W. Koch (S. proc&mbens, Hort.). 

 Dwarf, procumbent shrub, about Hft. high, with 

 ascending branches, glabrous: Ivs. elliptic to oblong, 

 acute at both ends, crenately serrate above the middle, 

 glabrous, J^-l in. long: fls. white, in small corymbs, 

 about 2 in. across: follicles glabrous, with upright ter- 

 minal styles. June. Tyrol. G.C. II. 11:752. M.D.G. 

 1912:186. R.F.G.24:151. G.M. 57: 746 Pretty shrub 

 for rockeries. 



SECTION III. SPIRAHIA. Species Xos. 43-55. 



A. Infl. a broad panicle, about as broad as 



high. ( Hybrids of species of this and 



the preceding section.) 



B. Panicles rather small, on lateral 



branchlets at the end of last year's 



branches 43. Fontenaysii 



BB. Panicles large, terminal on long, up- 

 right branches. 

 C. Lvs. glabrous or nearly so. 



D. Apex of Ivs. acute 44. conspicua 



DD. Apex of Ivs. obtuse or acutish. 

 E. Shape of Ins. broadly ovate or 



obovate 45. notha 



EE. Shape of Ivs. oblong or oval- 

 oblong 46. pyramidata 



cc. Lvs. pubescent or tomentose 

 beneath. 



D. Base of Ivs. acute 47. sanssouciana 



DD. Base of Ivs. rounded 48. Watsoniana 



AA. Infl. an elongated panicle, 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 49. salicifolia 



EE. Fls. white 50, alba 



DD. Panicles glabrous 51. latifolia 



CC. Lvs. coarsely senate above the 



middle: fls. pink 52. Menziesii 



BB. Foliage pubescent or tomentose 



beneath. 



C. Follicles glabrous: Ivs. grayish or 

 whitish tomentose beneath. 



