Class X. Order II. 107 



June, July. The Monotropas are said to be parasitic, sub- 

 sisting on the roots of other plants. 



DIGFNIJ1. 



130. SCLERANTHUS. 



SCLERANTHUS ANNUus. L. Common Knawe.1. 



Calyx of the ripe fruit with sharp, spreading 

 teeth ; stems spreading. Sm. 



A small, obscure plant in gravelly soils, road sides, Sec. 

 Stems spreading, decumbent, short. Leaves linear, acute, 

 short, opposite. Flowers green, sessile, in terminal, leafy clus- 

 ters. Calyx with five acute, spreading, permanent segments. 

 Stamens from five to ten. July. Annual. 



131. . SAXIFRAGA. 

 SAXIFRAGA VERNALIS. Willd. Early Saxifrage. 



Pubescent; leaves oval, somewhat petioled, 

 crenate ; flowers erect, pauicled, nearly sessile, al- 

 ternate. 



Syn. SAXIFRAGA VIRGIHIENSIS. Midi. 



One of the earliest flowers upon rocks and dry hills. 

 Leaves mostly radical, spreading, fleshy, elliptical, a little pu- 

 bescent, crenate or serrate, and tapering into a broad petiole. 

 Stem erect, fleshy, hairy, nearly destitute of leaves. Flowers 

 numerous, crowded, white, arranged in corymbs on the ends 

 of the branches, which, collectively form a sort of panicle. 

 April, May. Perennial. 



SAXIFRAGA PENNSYLVANIA. L. Pennsylvanian Saxifrage. 



Leaves oblong-lanceolate, a little hairy, denti- 

 culate ; stem naked ; peduncles alternate, forming 

 corymbed heads. WiUd. 



