102 FOUNDATIONS OF BOTANY 



I. SAXIFRAGA, L. 



Herbs with, simple or palmately cut leaves and generally 

 cymose or panicled flowers. Sepals 5, more or less united. 

 Petals 5, entire, inserted on the calyx-tube. Stamens 10. 

 Capsule consisting of 2 (sometimes more) ovaries, united at 

 the base, separate and diverging above. 



1. S. virginiensis, Michx. EARLY SAXIFRAGE, MAYFLOWER. 

 Perennial. Stemless, with a cluster of spatulate, obovate, or wedge- 

 shaped root-leaves and a scape 3-9 in. high, which bears a dense 

 cluster of small white flowers, becoming at length a panicled cyme. 

 Petals white, oblong, much longer than the calyx. Rocks and dry 

 hillsides N. 



2. S. pennsylvanica, L. SWAMP SAXIFRAGE. Perennial. 

 Leaves 4-8 in. long, oblong-lanceolate and tapering to the base, 

 slightly toothed. Scape 1-2 ft. high, bearing an oblong cluster of 

 small greenish flowers, at length diffusely panicled. Petals green- 

 ish-yellow (rarely crimson), linear-lanceolate, hardly longer than the 

 calyx-lobes. Boggy ground. 



II. TIARELLA, L. 



Perennial. Flowers white, in racemes. Calyx white, 

 5-parted, nearly free from the ovary. Corolla of 5 very nar- 

 row petals, with slender claws, alternating with the calyx- 

 lobes. Stamens 10, springing from the calyx-tube arid 

 extending outside the flower. Styles 2, long and slender. 

 Ovary 1-celled, 2-beaked. In fruit one of the carpels grows 

 to be much larger than the other, thus making up the main 

 bulk of the thin, dry pod, which has a few seeds attached 

 near the bottom. 



1. T. cordifolia, L. FALSE MITRE-WORT. Stem 5-12 in. high, 

 usually leafless, sometimes with 1 or 2 leaves. Rootstock bearing 

 runners in summer. Leaves heart-shaped, sharply lobed, the lobes 

 with acute or mucronate teeth, somewhat hairy above, downy 

 beneath. Raceme short and simple. Rocky woods, especially N. 



IH. MITELLA, Tourn. 



Delicate perennial herbs. Flowers small, pretty, in a sim- 

 ple raceme or spike. Calyx 5-cleft, adnate to the base of the 



