CULTURAL AND DESCRIPTIVE NOTES ON THE GENUS SAXIFRAGA. 47 



S. Mcrtensiana, Bong. — Leaves cordate, deciduous ; flowers 

 white, very pretty. Hab. California. 



S. pennsylvanica, L. — Leaves lanceolate ; flowers small, 

 yellow, on long flower stalks, two to three feet long. Hab. 

 North America. 



S. virginica, Nutt. — Leaves spatulate, rather thick and cre- 

 nate ; flower white, in a clustered cyme ; the variety with double 

 flowers is a pretty garden form. Hab. Virginia. 



Sect. Miscopetalum, Tausch. 



Hardly any of the species and numerous varieties included 

 here can be called pretty, and they are seldom grown outside 

 botanic gardens. They will succeed in the ordinary border, and 

 are increased by seed, which is often produced in enormous 

 quantities. 



S. rotundifolia, L. — Leaves reniform, hirsute ; flowers white, 

 in panicles. Hab. the Alps. 



Sect. Isomeria, Torr. et Gray. 



Nearly all these are very pretty, and easily grown in a damp 

 border. A great many are splendid foliage plants. Increased by 

 division of the rhizomes and by seed. 



S. aconitifolia, Field, (Boykinia aconitifolia, Nutt). — Leaves 

 orbicular, hairy ; flowers white, in a clustered cyme. Hab. 

 North America. The true plant is rare. 



S. ranunculifolia, Hook. — Leaves orbicular ; flowers white. 

 Hab. North America, on low, damp ground. 



Sect. Peltiphyllum, Engl. 



Only represented by a single species. Easily increased by 

 division of the rhizome or by seed. 



S. pcltata, Torr. — Leaves large, peltate, glandular ; petiole 

 one to two feet long ; flowers pale pink in a dense cyme. A 

 deciduous species, flowering in the early spring when without 

 foliage. It prefers a damp, shady position, and is, undoubtedly, 

 one of our best foliage plants. Hab. California, near rivers. 



Sect. Cymbalaeia, Griseb. 



Either annuals or biennials, rarely perennials ; easily in- 

 creased by seeds. 



