DIEFFENBACHIA 



DIERVILLA 



483 



late-macul4ta, Lind. & Andr^ (D. iUilstris. Hort. ). 

 LiVS. glaucous-preeB. profusely white-barred and white- 

 spotted. Brazil. I.H.23:234. 



J^nmani, Veitch. Lvs. rich, bright, glossy green, re- 

 lieved by a milk-white band at every lateral nerve, and 

 by a few white spots interspersed between the bands. 

 Guiana. 



magroitica, Lind. & Rod. Lvs. ovate-acuminate, large, 

 dark green, blotched and spotted with white along the 

 veins. Venezuela. LH.30:482. S.H.2, p.383. 



marmdrea, Hort. See Parlatorei. 



Parlatdrei, Lind. & Andri?, var. Tnarmorea, Andr^ 

 (Z>. memoriit and niorniora and Coysii, Hort.) . Lvs. 

 long-oblong, acuminate, the midrib white and the blades 

 blotched white, the green deep and lustrous. Colombia. 

 LH. 24: 291. — Engler refers this plant to the genus 

 Philodendron. 



Reglna, Bull. Lvs. oblong-elliptical, greenish white, 

 mottled and blotched with alternate light and green 

 tints. S. Amer. 



R^x, Hort. Compact: lvs. oblong-lanceolate, the two 

 sides not equal, deep green, but the white angular 

 blotches and midrib occupying more space than the 

 green. S. Amer. 



spUndens, Bull. Stem faintly mottled with dark and 

 light green: lvs. have a thick ivory white midrib, and 

 the ground color is of a deep, rich, velvety bottle green, 

 with a resplendent, lustrous surface, freely marke<l 

 with whitish striate blotches. Colombia. 



triumphans, Bull. Lvs. dark green, ovate-lanceolate 

 and acuminate, a ft. long, irregularly marked with angu- 

 lar yellowish blotches. Colombi.T. 



Jared 6. Smith and G. W. Oliver. 



DIfiLYTEA. See Dicentra. 



DIEKVtLLA (after Dierville, a French surgeon, who 

 took D. Lonicera to Europe early in the eighteenth 

 century). CaprifoUAcere. Weigela. Shrubs of spread- 

 ing habit, with more or less arching branches, and, es- 

 pecially the Asiatic species, with very showy fls. from 

 pure white to dark crimson, appearing late in spring. 

 Lvs. opposite, petioled, serrate : fls. in 1 to several-fld. 

 axillary cymes, often panicled at the end of the branches, 

 yellowish white, pink or crimson, epigynous ; calyx 5- 

 parted; corolla tubular or campanulate, 5-lobed, some- 

 times slightly 2-lipped ; stamens 5 : fr. a slender, 2- 

 celled capsule, with numerous minute seeds. About 10 

 species in E. Asia and N. Amer. They thrive in any 

 common humid garden soil, the Amer. species pre- 

 ferring moist and partly shaded positions. The Asiatic 

 species require protection north during the winter, or 

 sheltered positions. Prop, readily by greenwood cut- 

 tings or hardwood cuttings; the Amer. species usually by 

 suckers and by seeds sown in spring. 



Index of species {some of the names in italics were 

 described under Weigela): amabilis, 3; arborea, 4; 

 arborescens, 6 ; Canadensis, 1 ; Cnraeensis. 4 ; flori- 

 bunda, 6 ; florida, 3 ; grandifiora, 4 ; Groenewetjeiii, 7; 

 hortensis.o; hybrida, 7; Japonica,5; Lonicera, 1; Mid- 

 dendorfiana, 8 ; multiflora, 6; rosea, 3; sessilifolia, 2 ; 

 Steltzneri, 7; trifida, 1 ; Van Boiittei, 7. 



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

 1 iervilla proper. 



1. Lonicera, Mill. (D. Irifida, Mcench. D. Canadensis, 

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

 glabrous: lvs. distinctly petioled, ovate-oblong, acumi- 

 nate, serrate, nearly glabrous, finely ciliate, 3-4 in. long: 

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

 June, .Julv. Newfoundland to Saskatschewan, south to 

 Ky. and N. C. B.M. 1796. D. 44. 



2. sessilUdlia, Buckl. Shrub, to 5 ft. : branchlets quad- 

 rangular : lvs. nearly sessile, ovate-lanceolate, serrate, 

 nearly glabrous, of firmer texture, 3-6 in. long: cymes 

 .3-7-fld., often crowded into dense, terminal panicles: 

 limbshorterthan the tube. June, July. Carol, and Tenn. 

 G.C. in. 22: 14. -Hardy in Canada. 



AA. Fls. shotfi/y u-hite, pink or crimson, rarely 



yellowish. 



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



c. Calyx lobes lanceolate, connate at the base, often to 



the tniddle: stigma 2-lobed: seeds wingless. 



3. S16rida, Sieb. & Zuoc. ( Weigela rdsea, Lindl. W. 

 amdbilis, Hort.). Shrub, to 6 ft.: branchlets with 2 

 hairy stripes : lvs. short-petioled, elliptic or ovate-ob- 

 long, serrate, glabrous above except at the midrib, to- 

 mentose on the veins beneath : calyx nearly glabrous : 

 ovary slightly hairy: fis. 1-3, pale or deep rose, 1^4 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 :.")77.-This is one of the most culti- 

 vated species, very free-flowering and rather hardy. 

 Var. dlba. Fls. white, changing to light pink. R.H. 

 1861:331. Var. cindida. Fls. pure white. Var. Isoline. 

 Fls. white or slightly pink outsiile, wilh yellowisli spot 

 in throat. F.S. 14:144."). Var. Kosteriana variegata. 

 Dwarf: lvs. bordered yellow: fls. deep rose. Var. Sie- 

 boldi alba-margin&ta, Lvs. bordered white : fls. rose. 

 Var. n^na variegita. Dwarf. Lvs. variegated with 

 white: fls. nearly wliite. 



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

 winged : stigma capitate. 

 D. Plant nearly glabroiis. 



4. grandifldra, Sieb. & Zucc. {D. Coraeinsis, DC. 

 D. amdbilis, Ga.Tr.). Shrub, 5-10 ft. : lvs. 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 funnel form, abruptly narrowed below the mid- 

 dle, changing from whitish or pale pink to carmine. 

 May, June. Jap. S.Z. 31. F.S. 8:855. — Vigorously grow- 

 ing shrub, with large lvs. antl fls.. but less free-flower- 

 ing, and the type not common in cultivation. Var. 

 arbdrea, Hort. ( W. arbfirea grandifldra, Hort.). Fls. 

 yellowish white, changing to pale rose ; of vigorous 

 growth. 



DD. Plant more or less pubescent : corolla finely 

 pubescent outside. 



5. Jap6nica, DC. Shrub, to 6 ft. : lvs. oblong-obovate 

 or elliptic, acuminate-serrate, sparingly pubescent 



710. Diervilla hybrida (X K). 



above, tomentose beneath: fls. usually in 3-fld., shori- 

 peduncled cymes, often crowded at the end of short 

 branchlets; corolla broadly funnel form, narrowed helow 

 the middle, whitish at first, changing to carmine; style 



