110 KEY AND FLORA 



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

 lobes. Boggy ground. 



2. S. virginiensis Michx. Early Saxifrage, Mayflower. 

 Perennial. Apparently stemless, with a cluster of spatulate, obovate, 

 or wedge-shaped basal 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. 



n. TIARELLA L. 



Perennial. Flowers white, in racemes. Calyx white, 5- 

 parted, nearly hypogynous. Corolla of 5 very narrow petals, 

 with slender claws, alternating with the calyx lobes. Stamens 

 10, springing from the calyx tube and 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 Mitkrwort. 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 be- 

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



III. HEUCHERA L. 



Perennials, with a tall scape and roundish, heart-shaped 

 basal leaves. Plowers rather small, greenish or purplish, in a 

 long panicle. Calyx 5-cleft, the tube somewhat perigyuous. 

 Petals 6, small, spatulate, inserted with the 5 stamens on the 

 margin of the calyx tube. Capsule 1-celled, 2-beaked, splitting 

 open between the beaks. 



1. H. americana L. Common Alum Root. Scapes 2-4 ft. high, 

 rather slender, often several from the same root, hairy and glandu- 

 lar. Basal leaves large and long-petioled, abundant, somewhat 

 7-lobed. Flowers whitish with a tinge of purple, in a loose panicle. 

 Stamens projecting considerably outside the flower, their anthers 

 of a bright terra cotta color. The root is very astringent and is 

 somewhat used as a home remedy. Shaded banks, fence rows, arid 

 thickets ; common AV. 



