SAXIFRAGACEAE- 97 



Leaves mostly radical, on long petioles, those on the scape opposite 

 and sessile. 



1. IH. li pliyl'la, L. Leaves cordate, acute, somewhat 3- 5- 

 lobed, unequally dentate ; scape 2-leaved, many-flowered. 

 TWO-LEAVED MITELLA. Bishop's Cap. Mitre-wort. 



Radical leaves % to 3 inches long; petioles 2 to 6 inches long. Scape 12 to 18 

 inches high (often several from, the same root), slender. Flowers white, a little 

 distant, in a simple raceme, 4 to 8 inches in length ; petals deeply pinnatifid toward 

 the apex, entire and cuneate at base. Seeds obovoid, purplish black, smooth and 

 shining. 



Hob. Rich woods; along Brandy wine: frequent. PL April. Fr. June. 

 2. Leaves mostly opposite ; petals wanting. 



146. CHRYSOSPL.EWIUM, Tournef. 



Gr. Chrysos, gold, and Splen, spleen; figuratively, a, golden remedy for the spleen. J 

 Calyx 4- or 5-cleft; segments obtuse. Stamens 8 or 10, inserted on 

 a fleshy disk. Capsule 2-lobed, very short, 1-celled, 2-valved at 

 top. Succulent prostrate subaquatic plants. 



1. C. Americanum, Schweinitz. Steins slender, diffusely 

 spreading; leaves roundish-ovate, obscurely crenate-lobed ; calyx 

 mostly 4-cleft, and stamens 8. 

 AMERICAN CHRYSOSPLENIUM. Golden Saxifrage. Water-Carpet. 



Smooth and purplish green. Stem 4 to 8 or 10 inches long, with short axillary 

 opposite branches toward the base, dichotomously branching near the summit. 

 Leaves ^ to % of an inch long, and generally wider than long, abruptly narrowed 

 to a short flat petiole. Flowers sessile, terminal, axillary and dichotomal, appear- 

 ing somewhat corymbose on the short terminal branches; anthers reddish-orange 

 color. Seeds hispid. 

 Hob. Shaded rocky rivulets, and springs : frequent. Fl. April. Fr. June. 



SUBORDER II. HYDRAN'GEAE* 



Shrubs; leaves opposite, petiolate; calyx-tube entirely adherent to the ovary; petals 

 valvate in the bud. 



14?. HYDRANGEA, Gronov* 



[Gr. Hydor, water, and Angeion, a vase ; from the form of the capsules]. 

 Calyx-tube hemispherical, 8- to 10-ribbed; border 4- or 5-toothed. 

 Stamens 8 or 10. Capsule 2-celled, 2-beaked, opening between the 

 beaks; seeds oblong, striate. Flowers cymose, of 2 forms, the 

 marginal ones often radiate and abortive. 



1. IB . arborscen, L. Leaves oblong-ovate, acuminate, ser- 

 rate, obtuse or subcordate at base ; cymes flat ; flowers nearly all 

 fertile. 



H. vulgaris, MX. $ FL Cestr. ed. 2. p. 269. 

 ARBORESCENT HYDRANGEA. Wild Hydrangea. 



Stem 4 to 6 feet high, with opposite branches. Leaves 3 to 6 inches long; peti- 

 oles 1 to 2 inches in length. Cymes terminating the young branches, pubescent, 

 rarely radiate; flowers white or ochroleucous. 

 Hah. Banks of Schuylkill : rare. Fl. July. Fr. Sept. 



ORDER XLIII. HAMAMELACEAE. 



Shrubs; leaves alternate, simple; stipules deciduous; calyx adherent to the base of 



