1 H. arborescens L. Lvs. ovate, obtuse, or cordate at base, acuminate, serrate-dentate, paler beneath, nearly smooth; fls. in fastigiate cymes. - An elegant shrub, native in the Mid and West. States, cultivated in the Northern, attaining the height of 5 or 6f on its native, shady banks. Fertile fls., small, white, becoming roseate, very numerous. The sterile fls. are often reduced or wanting. The cultivated varieties have either the marginal flowers radiate, or all sterile and radiate. (H. vulgaris Mx.)
2 H. quereifolia Bartram. Lvs. deeply sinuate-lobed, dentate, tomentous beneath, and on the petioles and veins above; cymes paniculate, radiant, the sterile fls. very large and numerous. - A. superb species, native of Fla. and S. Ga., in wet, springy places, also often cultivated. Shrub 4 to 8f high. Lvs. nearly all as broad as long (5 to 10'), green above, hoary beneath; panicles dense, thyreoid, large, pvramidal, the sterile fls. 18" broad, with orbicular, white or roseate sepals. Often cultivated. May, Jn. (H. vulgaris Mx.) (Fig. 271.)
3 H. radiata Walt. Lvs. ovale, abrupt or cordate at base, acuminate, serrate, silvery-tomantous beneath; cymes fastigiate, radiate. - Upper country of Ga., Car. and Tenn. Shrubs 6 to 8f high. Sterile fls., white, smaller than in No. 2, often reduced to 3, 2 or 1 sepal. The silver white of the under leaf-surface is a striking character. † May, Jn.
4 H. hortensis L. Changeable Hydrangea. Lvs. elliptical, narrowed at each end, dentate-serrate, strongly veined, smooth; cymes radiant; fls. mostly sterile. - Probably native of China, where it has long been cultivated. Sts. 1 to 3f high. Lvs. large. Barren fls., very numerous and showy, at first green, passing successively through straw-color, sulphur yellow, white, purple, and pink. The perfect fls. are central and much smaller. It thrives in large pots of peat mixed with loam, abundantly watered. The flowers endure several months. †
13. DECUMA'RIA, L. (Lat. decem, ten; from the 10-parted flowers.) Fls. all fertile; calyx 7 to 10-toothed, tube adherent to the 5 to 10-celled ovary; petals as many as calyx teeth, oblong-spatulate, valvate in the bud; stamens 3 times as many as the petals, in one row, epigynous; stigma as many as petals, radiate, capsule urn-shaped, many-ribbed, crowned with the style, ∞-seeded. - A shrub creeping or climbing by rootlets, with opposite lvs. and cymes of white, fragrant fls. D. barbara L. A beautiful climber, in damp woods, N. Car. to Fla. and La., ascending trees 15 to 30f. Lvs. ovate or oval, entire or obscurely serrate, acute or acuminate, very smooth, - those of the young creepers elliptical, irregularly toothed. Cymes terminal on the divergent branches, with numerous fls. Caps. persistent, exhibiting in winter their curious structure. May, Jn.
14. PHILADEL'PHUS, L. False Syringa. (To Philadelphus, king of Egypt.) Calyx 4 to 5-parted, half superior, persistent; corolla 4 to 5-petaled; style 4-cleft; stamens 20 to 40, shorter than the petals; capsule 4-cellcd, 4-valved, with loculicidal dehiscence; seeds many, arilled. - Handsome flowering shrubs. Lvs. opposite, exstipulate.
1 P. inodorus L. Glabrous; lvs. ovate, acute or somewhat acuminate, triple-veined, entire, or with few obscure teeth; sep. acute, scarcely longer than the lube; sty. united. - Va. to Ala. in the upper country (Buckley). Fls. small, several at the cud of each branchlet, inodorous. May, Jn.
2 P. grandiflorus Willd. Lvs. ovate, acuminate, sharply denticulate, 3-veined, axils of the veins hairy; sep. acuminate, much longer than the tube; stig. 4, linear; sty. united. - A very showy shrub, 6f high, native at the South, cultivated in shrubberies. Branches smooth, long and slender. Fls. large, in a terminal umbel of 2 or 3, white, nearly inodorous. Jn. - The upper lvs. are often entire and quite narrow. †
3 P. coronarius L. Mock Orange. Lvs. ovate, subdentate, smooth; sty. distinct. - Native of S. Europe. A handsome shrub, often cultivated in our shrubberies. The fls. are numerous, cream-colored, showy, resembling those of the orange both in form and fragrance, but are more powerful in the latter respect. It grows 5 to 8f high, with opposite, smooth, ovate, stalked lvs. and opposite, reddish twigs bearing leafy clusters of llowers. †
15. DEUT'ZIA gracilis and D. scabra, are two handsome shrubs occasionally cultivated in parks. The genus is readily recognized by the filaments, which are 3-cuspidatc at the top, bearing the anther on the middle cusp.
D. scabra Thunberg, has ovate, acute, sharply serrate, pilous leaves, with terminal, downy racemes of handsome, bell-shaped, white flowers, each usually with 3 pistils. † Eastern Asia.