ANALYTICAL KEY 21 



FALSE MITREWORT, TIARELLA CORDIFOLIA (p. 74). 

 0. Stamens less than ten. 

 p. Sepals and petals three. 



FALSE MERMAID, FLOERKEA PROSERPINACOIDES (p. 88). 

 p. Sepals and petals four (.Crucifers). 

 q. Plants more or less pubescent, some or all of the hairs 



being branched. 

 r. Pods triangular; root-leaves usually more or less pinnatifid; 



stem leaves arrow-shaped. 



SHEPHERD'S PURSE, CAPSELLA BURSA-PASTORIS (p. 71). 

 r. Pods conspicuously elongated, not triangular. 

 8. Leaves mostly radical, oblong to obovate, entire or nearly 

 so. WHITLOW GRASS, DRABA CAROLINIANA (p. 71). 

 S. Radical leaves lyrate-pinnatifid; stem leaves present, 

 though often few in number. 



ROCK CRESS, ARABIS LYRATA (p. 73). 

 q. Plants smooth, or if hairy, hairs simple. 

 r. Pods roundish; stamens two; some of the lower leaves 

 pinnatifid. PEPPERGRASS, LEPIDITTM APETALUM (rarely), 

 and L. VIRGINICTJM (p. 71). 

 r. Pods elongated; stamens six. 

 8. Leaves compound. 

 t. Leaves palmate (Toothwort). 

 U. Rootstock continuous; stem leaves two, 3-foliolate. 



DENTARIA DIPHYLLA (p. 72). 



U. Rootstock separable into tubers; stem-leaves three, 

 about five-cleft. DENTARIA LACINIATA (p. 72). 



t. Leaves pinnate. 



CARDAMINE PENNSYLVANIA (p. 73). 

 8. Leaves simple. 



t. Underground stem tuberous; stem leaves petioled to 

 sessile, not clasping. 



SPRING CRESS, CARDAMINE BTJLBOSA (p. 73). 

 t. Underground stem not tuberous; stem leaves arrow- 

 shaped, clasping. ARABIS LAEVIGATA (p. 73). 

 n. Petals not white. 



O. Sepals and petals in fours or sixes. 



p. Sepals and petals in sixes; leaves compound; flowers greenish. 

 BLUE COHOSH, CATJLOPHYLLUM THALICTROIDES (p. 67). 

 p. Sepals and petals in fours (Crucifers). 

 q. Petals pinkish to purplish; stem leaves not clasping. 

 T. Underground stems tuberous; leaves entire or sparingly 

 toothed. 



SPRING CRESS, CARDAMINE DOUGLASH (p. 73). 

 r. Underground stems not tuberous; leaves three-parted. 



TOOTHWORT, DENTARIA LACINIATA (p. 72). 

 q. Petals greenish; underground stems not tuberous; stem 

 leaves arrow-shaped, clasping. 



ARABIS LAEVIGATA (p. 73). 

 O. Sepals and petals in fives. 



p. Leaves compound (j-foliolate) ; underground stem bulbous 

 (flowers pink to purple). 



VIOLET WOOD SORREL, OXALIS VIOLACEA (p. 85). 



