1622 



HYDRANGEA 



HYDRANGEA 



(3) Stellata group: fls. with many narrow sepals. 



Var. stellata, Dipp. (H. stellata, Sieb. & Zucc.). 

 Lvs. ovate or ovate-oblong, sparingly pubescent: 

 cymes with larger sterile and smaller fertile fls., 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, Regel). The fertile fls. 

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

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

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

 red. 



There are also some varieties with variegated Ivs., as 

 var. variegata, Hort. (H. japonica variegata, Hort.), 

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

 1861:108); var. filbo-variegata, Hort. (H. japdnica 

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

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

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

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

 the Ivs. spotted white and edged pink; var. niyalis, 

 Hort. (H. Hortensia nivdlis, 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. 



1932. Hydrangea 



Bretschneideri. 



(XK) 



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

 teeth at the apex; styles usually 2. 

 D. Cymes without involucre at the base. 

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

 below: seeds not winged. 

 F. Lvs. glabrous below. 



8. arborescens, Linn. (H. urticifolia, Hort.). Erect 

 shrub, 4-10 ft. : Ivs. 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 Ivs. broadly ovate 

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

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

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

 rounded or abruptly contracted at the base. It is 

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

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

 sterile: heads 5-7 in. across; fls. %-l in. across with 

 ovate acute sepals: Ivs. ovate to ovate-elliptic, 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; 34:259. 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. : Ivs. membranous, 

 oval or broadly ovate to ovate-oblong, rounded or 

 cordate at the base, serrate, densely grayish pubescent 

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

 with sterile fls. June, July. B.B. 2 : 185 (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 3/in. across with oval obtuse sepals. F.E. 

 28:359; 30:911. 



10. radiata, Walt. (H. nivea, Michx.). Similar to the 

 former, but Ivs. 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 Ivs. strigose or 



densely clothed with rough hairs: seed winged. 



F. Base of Ivs. 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: Ivs. ovate 

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

 dull green and hairy above, densely rough-villous 

 below, 6-12 in. long; petioles 1^-3^ in- long: cymes 

 nearly flat, dense, 5-6 K 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 Ivs., 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. R6sthornii, Diels. Shrub, to 12 ft.: branchlets 

 strigose: Ivs. roundish-ovate or ovate, occasionally 

 ovate-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 1^-4 in. long: cymes 

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

 purplish; sepals suborbicular or oval, entire or serrate; 

 styles 2. July. W. China. 



FF. Base of Ivs. cuneate. 



13. strigdsa, Rehd. (H. dspera, Hemsl., not Don). 

 Shrub, to 8 ft.: branchlets strigose: Ivs. 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, \-\Yi 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.: Ivs. 

 oblong, acuminate, densely and sharply serrate, 

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



