1622 



HYDRANGEA 



HYDRANGEA 



(3) Stellala group: fls. with many narrmv sepals. 



Var. stellata, Dipp. {H. stellala. Sieb. & Zucc). 

 Lvs. ovate or ovate-oblong, sparingly pubescent: 

 cymes with larger sterile and smaller fertile fis., both 

 with many narrow-elliptic sepals. S.Z. 59. Var. 

 fimbriata, Dipp. Cymes rather dense, with almost all 

 the fls. sterile; sepals fimbriate, white, pink toward the 

 base. G.C. III. 23, suppl. May 28. Var. prolifera, 

 Hort. (H. stellata var. prolifera, Kegel). The fertile fls. 

 bearing 1 or few smaller ones in the center. Var. 

 rfibro-plena, Dipp. Cymes rather dense, with almost 

 all fls. sterile, changing from pink or pale hlac to dark 

 red. 



There are also some varieties with variegated lvs., as 

 var. variegata, Hort. (H. japdnica mriegata, Hort.), 

 a form of var. japonica with the lvs. edged white (H.F. 

 1861:108); var. albo-variegata, Hort. (//. japdnica 

 fol. dlbo-ttariegatis, Hort.), a form of var. Belzonii, 

 with the lvs. edged white (F.S. 7:696. G. 27:517); 

 var. tricolor, Hort., with the lvs. variegated with white 

 and edged yellow; var. roseo-marginata, Hort., with 

 the lvs. spotted white and edged pink; var. nivalis, 

 Hort. (H. Hortensia nivalis, Bull & Sons). Lvs. with a 

 deep green margin and an irregular patch of creamy 

 white in the center. G.C. III. 32:455. G.M. 47:639. 



cc. Ovary inferior, hence caps, truncate, mth the calyx- 

 teeth at the apex; styles usually 2. 

 D. Cymes without involucre at the base. 

 E. Branchlets and lvs. glabrous or lvs. villous or tomentose 

 below: seeds not winged. 

 F. Lvs. glabrous below. 

 8. arborescens, Linn. {H. urticifblia, Hort.). Erect 

 shrub, 4-10 ft.: lvs. long-petioled, ovate, acute or acu- 

 minate, rounded or cordate at the base, serrate, green 

 and glabrous on both sides or somewhat pubescent or 

 glaucous beneath, 3-6 in. long: cymes 2-5 in. broad, 

 with none or few sterile fls. June, July. N. J. to Iowa, 

 south to Fla. and Mo. B.M. 437. G.W. 15, p. 612. 



Var. cordata, Torr. & Gray, has the lvs. broadly ovate 

 and cordate. Var. sterilis, Torr. & Gray. A form with 

 all the fls. sterile; sepals broadly oval, rounded or 

 mucronate at the apex: lvs. oval to oblong-ovate, 

 rounded or abruptly contracted at the base. It is 

 doubtful whether this form is still in cult. Var. grandi- 

 fl6ra, Rehd. A form of var. cordata with all the fls. 

 sterile: heads 5-7 in. across; fls. ^1-1 in. across with 

 ovate acute sepals: lvs. ovate to ovate-eUiptic, cordate 

 or rounded at the base. M.D.G. 1907:380; 1909:4: 

 1912:472. Gn. 75, p. 435. G.W. 13, p. 617. R.B. 

 33:375; 34:2.59. G. 31:671. F.E. 22:70; 28:359; 

 31:606. G.M. .50:357.— A striking plant with its 

 showy large heads of white fls.; quite hardy. 



FF. Lvs. tomentose or densely grayish pubescent below. 



9. cinerea. Small. Shrub, to 6 ft.: lvs. membranous, 

 oval or broadly ovate to ovate-oblong, rounded or 

 cordate at the base, serrate, densely grayish pubescent 

 below, 2J'2~6 in. long: corymbs 2-5 in. across, usually 

 with sterile fls. June, July. B.B. 2 : 1S5 (as H. radiata) ; 

 (ed. 2) 2:231. N. C. to Tenn. and Ala. Var. sterilis, 

 Rehd. All fls. sterile, in dense heads 5-7 in. across; 

 fls. about J-^in. across with oval obtuse sepals. F.E. 

 28:3.59; 30:911. 



10. radiata, Walt. (//. nivca, Michx.). Similar to the 

 former, but lvs. leathery, densely whitish tomentose 

 and reticulate beneath and cymes always with sterile 

 fls. June, July. N. C. and S. C. F.E. 32:11. 



EE. Branchlets strigose or bristly and lvs. strigose or 



densely clothed with rough hairs: seed winged. 



F. Base of lvs. rounded or subcordate. 



11. Sargentiana, Rehd. Shrub, to 6 ft. with stout 

 upright branches clothed with harsh hairs and stiff 

 bristles: young growth more or less purple: lvs. ovate 

 to ovate-oblong, shortly acuminate, crenate-serrate, 

 dull green and hairy above, densely rough-villoua 

 below, &-12 in. long; petioles lJ^-33'2 in- long: cjTnes 

 nearly flat, dense, 5-63 2 in- across; fertile fls. pale 

 violet, the sterile fls. white; style 2-3. July, Aug. 

 Cent. China. B.M. 8447. Gn. 77, p. 264. G.M. 55: 

 suppl. p. 5, June 1. — A strikingly handsome plant with 

 its large lvs., the dense pubescence purplish on the 

 young growth and with its large cymes bluish violet 

 in the center and surrounded by conspicuous white 

 sterile fls. It is rather tender and can be grown out- 

 doors in the S. only and demands a shady position. 



12. Rosthomii, Diels. Shrub, to 12 ft.: branchlets 

 strigose: lvs. roundish-ovate or ovate, occasionally 

 ovqte-oblong, acuminate, cordate at the base, unequally 

 or doubly fimbriate-dentate, sparingly strigose above, 

 densely grayish strigose and reticulate below, 4-9 in. 

 long and 3-7 in. broad; petiole IH— 1 in. long: cymes 

 4-7 in. across; sterile fls. 1-1 H in. across, white or 

 purplish; sepals suborbicular or oval, entire or serrate; 

 styles 2. July. W. China. 



FF. Base of lvs. cuneale. 



13. strigosa, Rehd. {H. dspera, HemsL, not Don). 

 Shrub, to S ft.: branchlets strigose: lvs. oblong-ovate 

 to elliptic-lanceolate or lanceolate, acuminate, serrulate 

 or serrate, sparingly strigose or nearly glabrous above, 

 densely strigose below, 3-7 in. long; petiole about 1 

 in. long: cymes 4-6 in. across; sterile fls. white or some- 

 times purple, 1-1 J-2 in. across, with broadly oval, 

 entire or serrate sepals; styles 2. Aug. Cent. China. 

 Var. macrophylla, Rehd. (H- dspera var. macrophylla, 

 HemsL). Lvs. 8-12 in. long: cymes to 8 in. across with 

 the sterile fls. about 2 in. broad. 



DD. Cyme inclosed before expanding by 6-8 large, 

 deciduous bracts. 



14. involucrata, Sieb. Low shrub, to 5 ft.: lvs. 

 oblong, acuminate, densely and sharply serrate, 

 appressed-pubescent on both sides, rough to the touch, 



'Jt 



