992 



DEUTZIA 



DEUTZIA 



DEUTZIA (named by Thunberg in honor of his friend 

 and patron, Johann van der Deutz). Saxifragacese. 

 Very ornamental shrubs grown for their showy white 

 or blush flowers appearing in spring or early summer. 



Upright: Ivs. deciduous, rarely persistent, opposite, 

 petioled, serrate, usually with rough stellate pubes- 

 cence: fls. in panicles, rarely in racemes or in corymbs, 

 white, sometimes purplish, epigynous; calyx-teeth 5; 

 petals 5; stamens 10, rarely more, shorter than the 

 petals; filaments usually winged and toothed at the 

 apex; styles 3-5, distinct:- caps. 3-5-celled, with 

 numerous minute seeds. About 50 species in E. Asia and 

 Himalayas and 1 in Mex. Monograph by Schneider in 

 M.D. 1904:172-188, and a hort. monograph by 

 Lemoine in J.H.F. 1902:298-314; see also Rehder in 

 Sargent, Plant. Wilson. 1 : 14-24 for Chinese species. 



The deutzias belong to our most beautiful and most 

 popular ornamental shrubs; they are very floriferous 

 and of easy cultivation. D. parviflora and D. grandi- 

 flora are the hardiest, and also D. gracilis, D. Sieboldi- 

 ana and D. scabra are hardy as far north as Massachu- 

 setts; the recently introduced D. longifolia, D. Schneid- 

 eriana, D. discolor, and D. Wilsonii have proved fairly 

 hardy with slight protection or in sheltered positions 

 at the Arnold Arboretum. One of the most tender is 

 D. purpurascens. Of the hybrids, D. Lemoinei is the 

 hardiest, while D. rosea has proved about as hardy as 

 D. gracilis; D. kalmisefiora, D. myriantha and others are 

 tenderer. Most of the deutzias have white flowers, but 

 D. rosea, D. purpurascens, D. longifolia, D. myriantha, 

 D. kalmisefiora and some varieties of D. scabra, have 

 the flowers carmine outside or pinkish. They flower 

 most profusely if pruned as little as possible, although 

 an occasional thinning out of the old wood soon after 

 flowering will be of advantage. 



The deutzias thrive in almost any well-drained soil, 

 and are well adapted for borders of shrubberies. 

 Potted plants forced with a temperature not exceed- 

 ing 50 develop into beautiful specimens for the decora- 

 tion of greenhouses and conservatories, especially 

 D. Lemoinei, D. gracilis and D. discolor. The same 

 plants cannot be forced again. Propagate readily by 

 greenwood and hardwood cuttings, also by seeds sown 

 in pans or boxes in spring. 



1245. Deutzia gracilis. ( X H) 



parviflora, 16. 

 plena, 3. 

 punctata, 3. 

 punicea, 3. 

 purpurascens, 8. 

 rosea, 2. 

 scabra, 3, 6, 

 Schneideriana, 4. 

 setchuenensis, 7. 

 Sieboldiana, 6. 

 superba, 5. 

 Veitchii, 9. 

 venusta, 2. 

 Vilmorinffi, 13. 

 Watereri, 3. 

 Wellsii, 3. 

 Wilsonii, 14. 



A. Petals valvate in the bud. 

 B. Fls. in panicles or racemes; calyx-teeth short (except 



in the hybrids). 

 c. Lvs. glabrous below or nearly so. 



1. gracilis, Sieb. & Zucc. Fig. 1245. Shrub, to 3 ft., 

 with slender, often arching branches: Ivs. oblong- 

 lanceolate, acuminate, sharply serrate, with sparse 

 stellate hairs above, nearly glabrous beneath, bright 

 green, 1-2 in. long: fls. pure white, in racemes; petals 

 erect or somewhat spreading, oblong; stamens much 

 shorter than the petals; calyx- teeth persistent. May, 

 June. Japan. S.Z. 8. P.F.G. 2, p. 7. F.S. 6:611. 

 R.H. 1891, p. 203. G.M. 50:563. Gn. 39, p. 200. 

 G.W. 12, p. 534. Gt. 1897:384. H.F. 1:48. J.F. 1:44. 

 V. 7:217. Var. aftrea, Schelle. Lvs. yellow. Var. 

 albo-marmorata, Lemoine. Lvs. sprinkled with white. 



2. rdsea, Rehd. (D. gracilis x D. purpurascens. D. 

 grdcilis rosea and D. discolor rosea, Lemoine). Lvs. 

 ovate-oblong, acuminate, bright green, slightly paler 

 below, very sparingly stellate-pubescent on both 

 sides: fls. pink, campanulate, in panicles; calyx-lobes 

 longer than the tube; filaments slightly toothed or 

 subulate, but strongly toothed in all varieties except 

 in var. venusta and var. multiflora. F.E. 30:423. G. 

 27:274. Var. campanulata, Rehd. With large white 

 campanulate fls. G. 28:485. Var. venusta, Rehd. 

 With white fls. G. 27:275. Var. multifldra, Rehd. 



With white fls. Var. eximia, 

 Rehd. With white fls. tinted 

 pink outside, in upright pani- 

 cles. Var. carminea, Rehd. 

 With light pink fls. tinted 

 carmine outside. Var. flori- 

 bunda, Rehd. With white fls. 

 tinted pink outside. J.H.F. 

 1902:312. Var. grandifldra, 

 Rehd. With fls. of the same 

 color, but larger. All these 

 varieties were originally 

 described by Lemoine as 

 varieties of D. gracilis ex- 

 cept the two last ones, which 

 he has under D. discolor. 



cc. Lvs. stellate-pubescent 



beneath. 

 D. Filaments all toothed at 



the apex. 

 E. Calyx-lobes shorter than the 



tube; petals upright. 

 3. scabra, Thunb. Shrub, 

 to 6 ft. : Ivs. all petioled, 

 ovate to ovate - lanceolate, 

 rounded at the base, crenate- 

 dentate, with rough pubes- 

 cence on both sides, dull 

 green, 1-3 in. long: panicles 

 erect, 2-4 in. long; fls. white 

 or blushed, with erect petals; 



