226 SYSTEMATIC BOTANY. 



4. Chrysosplenium. Calyx coherent with the ovary, 4~5-lobed, 

 colored within. Petals none. Stamens 8-10, with short filaments. 

 Styles 2. Capsule obcordate, compressed, i-celled, 2-valved. Seeds 

 numerous, if. 



C. AMERICANUM ( Water-carpet}. Stem slender, square, decumbent ; 

 leaves roundish-ovate, smooth ; flowers remote, sessile ; calyx usually 4-cleft, 

 greenish yellow, marked with purple lines ; stamens 8, very short, with 

 orange-colored anthers. In shady springs and streams. March-May. 



5. Hydrangea. Flowers either all fertile, or more commonly the 

 marginal ones are sterile. STERILE FLOWERS. Calyx colored, mem- 

 branaceous, veiny, 4-5-cleft. Petals, stamens, and styles none. FER- 

 TILE FLOWERS. Calyx-tube hemispherical, with a 4~5-toothed, persist- 

 ent limb. Petals ovate, sessile. Stamens twice as many as the petals. 

 Styles 2, distinct. Capsule 2-beaked. 



H. HORTENSIS (Changeable Hydrangea}. Leaves elliptical, serrated or 

 toothed, strongly veined, smooth ; cymes radiant ; flowers mostly sterile. In 

 cultivation, 1-2 feet high. 



6. Philadelphus. Calyx 4~5-parted, persistent, with the tube half 

 adherent to the ovary. Petals 4-5, convolute in prefloration. Stamens 

 20-40. Capsule 4-celled, 4-valved. Seeds with an aril. 



P. CORONARIUS (False Syringa). Leaves ovate, smooth, petiolate ; 

 flowers numerous, white, very fragrant, in leafy clusters at the ends of the 

 branches. A cultivated shrub, 5-7 feet high. June. 



7. Ribes. Leaves alternate and palmately lobed. Calyx 5-lobed. 

 Petals 5. Stamens 5, alternate with petals. Low shrubs, if 



1. R. RUBRUM (Currant}. Leaves subcordate, obliquely 3~5-lobed, 

 mostly pubescent beneath, serrate ; racemes nearly smooth, pendulous ; 

 flowers greenish, calyx rotate ; fruit globose, smooth, red, or sometimes 

 white. In gardens, it varying much in the size and color of fruit. 



2. R. AUREUM (Golden Currant}. Glabrous ; leaves 3-lobed ; flowers 

 numerous, golden yellow, very fragrant, in lax, many-flowered racemes ; 

 fruit smooth, globose, yellow, at length brown, pleasant. An ornamental 

 shrub. 



Order XXX. CRASSULACE/E. 



Succulent herbs, or shrubby plants. Leaves simple, without 

 stipules. Flowers usually in cymes. Sepals 3-20, more or less 

 united at base, persistent. Petals as many as the sepals. Sta- 

 mens as many as the sepals, and alternate with them, or twice 

 as many, inserted on the calyx, Ovaries as many as the petals, 

 and opposite to them. Follicles as many as the ovaries, many 

 seeded. 



