1008 



DIERVILLA 



DIER VILLA 



A. Fls. yellow, slightly 2-lipped, small, about %in. long. 



(Diervilla proper). 

 B. Lvs. glabrous or nearly so. 



1. Lonicera, Mill. (D. trifida, Moench. D.canadensis, 

 Willd.). Shrub, to 3 ft.: branchlets nearly terete, gla- 

 brous: Ivs. distinctly petioled, ovate-oblong, acuminate, 

 serrate, nearly glabrous, finely ciliate, 1^-4 in. long: 

 cymes usually 3-fld.; limb nearly equal to the tube: 

 caps, about J/jjin. long. June, July. Newfoundland to 

 Sask., south to Ky. and N. C. B.M. 1796. 



2. sessilifdlia, Buckl. Shrub, to 5 ft.: branchlets 

 quadrangular: Ivs. nearly sessile, ovate-lanceolate, ser- 

 rate, nearly glabrous, of firmer texture, 2-6 in. long: 

 cymes 3-7-fld., often crowded into dense, terminal 

 panicles; limb shorter than the tube: caps, about %in. 



1263. Diervilla japonica. ( X H) 



long. June, July. N. C. and Tenn. to Ga. and Ala. 

 G.C. III. 22:14; 42 :427. Hardy in Canada. 



BB. Lvs., branchlets and infl. pubescent. 



3. rivularis, Gattinger. Shrub, to 6 ft.: Ivs. short- 

 petioled, ovate to oblong-lanceolate, acuminate, trun- 

 cate or cordate at the base, doubly serrate, pubescent 

 on both sides, 1^-3^ in. long: cymes few- to many-fld., 

 crowded into terminal panicles; limb of corolla about 

 as long as tube: caps. ^in. long. July. Aug. N.C. to 

 Tenn., Ga. and Ala. G.C. III. 38:339. 



AA. Fls. showy, white, pink, or crimson, rarely yellowish. 



B. Anthers not connected with each other. (Weigela.) 



c. Calyx-lobes lanceolate, connate to or nearly to the 



middle; stigma 2-lobed: seeds almost wingless. 



4. florida, Sieb. & Zucc. (Weigela rbsea, Lindl. W. 

 amdbilis, Hort. D. pauciflora, Carr.). Shrub, to 6 ft.: 

 branchlets with 2 hairy stripes: Ivs. short-petioled or 

 nearly sessile, elliptic or ovate-oblong to obovate, 

 serrate, glabrous above except at the midrib, more or 

 less pubescent or tomentose on the veins beneath, 

 2-4 in. long: calyx nearly glabrous, with lanceolate 

 teeth; ovary slightly hairy; fls. 1-3, pale or deep rose, 

 134 in. long; corolla broadly funnel-shaped, abruptly 

 narrowed below the middle. May, June. N China 

 B.M. 4396. F.S. 3:211. B.H.1:577. Gt. 54, p. 86. R.H.' 

 1849:381. H.F. 1854:21. V. 18:37. This is one of the 

 most cult, species, very free-flowering and rather 

 hardy. Var. alba, Moore. Fls. white, changing to 

 light pink. R.H. 1861:331. Var. venusta, Rehd. 



Lvs. smaller, usually obovate, 1^-2 }/ in. long, 

 usually nearly glabrous: fls. in dense clusters with 

 small Ivs. at the base; corolla slender, about lj^ in. 

 long, rather gradually narrowed toward the base, lobes 

 oval to oval-oblong, rosy pink. Korea, N. China. 

 Recently intro.; very floriferous, early and hardy. 



5. preecox, Lemoine. Shrub, to 6 ft.: branchlets' 

 glabrous: Ivs. short-petioled, elliptic or elliptic-ovate, 

 acuminate, serrate, hairy above, soft-pubescent below, 

 2-3^ in. long: fls. clustered, 3-5, nodding; calyx with 

 subulate lobes; ovary hairy; corolla abruptly narrowed 

 below the middle, purplish pink or rose-carmine. Japan. 

 May. Gt. 46:1441; 53, p. 522. R.H. 1905:314. The 

 earliest of all species to bloom; has given rise to a race 

 of early-flowering hybrids as Avalanche, Gracieux, 

 Vestale, Conquerant, Esperance, Seduction, which see 

 under D. hybrida. 



cc. Calyx-lobes linear, divided to the base: seeds winged: 

 stigma capitate. 



D. Plant nearly glabrous. 



6. coraeensis, DC. (D. grandiflora, Sieb. & Zucc. D. 

 amdbilis, Carr.). Shrub, 5-10 ft.: Ivs. rather large, 

 obovate or elliptic, abruptly acuminate, crenately ser- 

 rate, sparingly hairy on the veins beneath and on the 

 petioles: fls. in 1-3-fld., peduncled cymes; corolla 

 broadly funnelform, abruptly narrowed below the mid- 

 dle, changing from whitish or pale pink to carmine. 

 May, June. Japan. S.Z. 31. F.S. 8:855. H.U. 1:19. 

 Vigorously growing shrub, with large Ivs. and fls., but 

 less free-flowering, and the type not common in cult. 

 Var. arbdrea, Rehd. (W. arbdrea grandiflora, Hort.). 

 Fls. yellowish white, changing to pale rose; of vigorous 

 growth. 



DD. Plant more or less pubescent: corolla finely pubescent 

 outside. 



7. japonica, DC. Fig. 1263. Shrub, to 6 ft.: Ivs. 

 oblong-obovate or elliptic, acuminate-serrate, sparingly 

 pubescent above, tomentose beneath: fls. usually in 

 3-fld., short-peduncled cymes, often crowded at the end 

 of short branchlets; corolla broadly funnelform, nar- 

 rowed below the middle, whitish at first, changing to 

 carmine, slightly pubescent or nearly glabrous outside; 

 style somewhat exserted. May, June. Japan, China. 

 G.F. 9:405 (adapted in Fig. 1263). Gn. 21, p. 184. 

 Var. hortensis, Rehd. (D. hortensis, Sieb. & Zucc.). 

 Lvs. nearly glabrous above, densely grayish tomentose 

 beneath: cymes usually rather long-peduncled; fls. 

 usually carmine. S.Z. 29, 30. More tender and slower- 

 growing than the type. Var. sinica, Rehd. Lvs. slen- 

 der-petioled, soft-pubescent beneath: fls. campanulate, 

 abruptly contracted below the middle into a narrow 

 tube, pale pink. Cent. China. Var. alba, Makino (D. 

 hortensis var. alba, Sieb. & Zucc. D. japonica var. 

 nivea, Rehd.). Like var. hortensis but fls. white. G.C. 

 II. 10:80. Gn. 22, p. 185; 34, p. 352. G. 28:392. 



8. floribunda, Sieb. & Zucc. (D. multiflora, Lem.). 

 Shrub, to 8 ft. : Ivs. oblong-ovate or elliptic, acuminate, 

 serrate, sparingly pubescent above, more densely 

 beneath: fls. 1-3, usually sessile, mostly crowded at the 

 end of short branchlets; corolla rather gradually nar- 

 rowed toward the base, pubescent outside, brownish 

 crimson in the bud, changing to dark or bright crimson; 

 lobes about 5 times shorter than the tube; style exserted. 

 May, June. Japan. S.Z. 32. I.H. 10:383. Vigorously 

 growing shrub, with rather small but abundant fls. 

 Var. grandiflora, Rehd. (W. arborescens, Hort.). Fls. 

 rather large, brownish crimson. Var. versicolor, Rehd. 

 (D. versicolor, Sieb. & Zucc.) Fls. greenish white at 

 first, changing to crimson. S.Z. 33. 



9. hybrida, Hort. (Fig. 1264), may be used as a col- 

 lective name for the different hybrids between D. 

 florida, D. prsecox, D. floribunda, D. japonica and D. 

 coraeensis, which are now more commonly cult, than the 



