GENUS I. 



HYDRANGEA FAMILY. 



231 



i. Hydrangea arborescens L. Wild Hydrangea. Fig. 2187. 



//. arborescens L. Sp. PI. 397. 1753. 

 Hydrangea vulgaris Michx. Fl. Bor. Am. 



i : 268. 1803. 

 Hydrangea arborescens kanawhana 



Millsp. Bull. W. Va. Agric. Exp. Sta. 



2: 363. 1891. 



A shrub, 4-io high, the young 

 twigs pubescent or glabrate. Peti- 

 oles slender, i'~4' long; leaves ovate, 

 thin, 3'-6' long, acute or often acu- 

 minate at the apex, rounded, cordate 

 or rarely broadly cuneate at the base, 

 sharply dentate, green both sides, or 

 pale beneath, glabrous above, some- 

 times pubescent beneath ; cymes 2'-5' 

 broad ; marginal sterile flowers usu- 

 ally few or none, but sometimes 

 numerous, or forming the entire in- 

 florescence, capsule wider than long. 



On rocky stream or river banks, 

 southern New York and New Jersey, 

 very abundant in the valley of the Del- 

 aware, to Iowa, south to Florida, Louisi- 

 ana and Missouri. Ascends to 4200 ft. 

 in North Carolina. June-July, some- 

 times blooming again in Sept. Seven- 

 barks. Hills-of-snow. 



2. Hydrangea cinerea Small. Ashy Hy- 

 drangea. Fig. 2188. 



Hydrangea cinerea Small, Bull. Torr. Club 25 : 148. 

 1898. 



A shrub 6-8 high, the twigs finely pubescent 

 or glabrate. Leaves slender-petioled, ovate, 

 rounded or cordate at the base, acute or acumi- 

 nate at the apex, 3'-6' long, slightly thicker than 

 those of the preceding species, green and nearly 

 glabrous above, tomentose beneath ; marginal 

 flowers, or at least some of them, sterile and' con- 

 spicuous; capsule longer than wide. 



Missouri to Tennessee and North Carolina, south 

 to Georgia. Snowy-hydrangea. June-July. Con- 

 fused in our first edition with Hydrangea radiata 

 Walt., of the southeastern states which has leaves 

 silvery-white beneath. 



2. PHILADELPHIA L. Sp. PI. 470. 1753. 



Shrubs, with opposite petioled simple deciduous leaves, and no stipules. Flowers large, 

 terminal or axillary, corymbose, racemose or solitary, white or cream-colored. Calyx-tube 

 top-shaped, adnate to the ovary, 4~5-lobed. Petals 4-5, convolute, rounded or obovate. 

 Stamens 20-40, inserted on the disk; filaments linear. Ovary 3-S-celled; styles 3-5, filiform, 

 distinct, or united at the base; ovules o. Capsule top-shaped, 3-s-celled, at length loculi- 

 cidally dehiscent by 3-5 valves, many-seeded. Seeds oblong, the testa membranous, pro- 

 duced at each end. [Named after King Ptolemy Philadelphus.] 



About 50 species, natives of North America, Mexico, Asia and central Europe. Besides the 

 following, about 25 others occur in the southern and western parts of North America. Called Mock 

 Orange from the orange-like blossoms of the various species. The common name Syringa is 

 unfortunate, being the generic name of the Lilac. 



Flowers in,odorous, solitary or few. 



Calyx-lobes about equalling the tube. 



Calyx-lobes about twice as long as the tube. 

 Flowers racemose, numerous, fragrant. 



1. P. inodorus. 



2. P. grandiflorus. 



3. P. coronarius. 



