ANALYTICAL KEY 21 



False Miteewort, TIARELLA CORDIFOLIA (p. 74). 

 0. Stamens less than ten. 

 p. Sepals and petals three. 



False Mermaid, FLOEREEA FROSERFINACOIDES (p. 88). 

 p. Sepals and petals four iCrucifers). 



_ 4. Plants more or less pubescent, some or all of the hairs 

 being branched. 

 I, Pods triangular; root-leaves usually more or less pinnatifid; 

 stem -leaves arrow-shaped. 

 Shepherd's Purse, CAFSELLA BURSA-FASTORIS (p. 71). 

 r. Pods conspicuously elongated, not triangular. 

 a. 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. 



Sock Cress, ARABIS LYRATA (p. 73). 

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

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

 pinnatifid. Peppergeass, lEFIDITTM AFEIALXTII (rarely), 

 and L. VIRGINICUM (p. 71). 

 T* Pods elongated; stamens six. 

 8* Leaves compound. 

 t* Leaves palmate (ToothworO. 

 u. Rootstoek continuous; stem leaves two, 3-foliolate. 



DENTARIA DIPHYLLA (p. 72). 

 11. Eootstock separable into tubers; stem-leaves three, 

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



•tt Leaves pinnate. 



CARDAMINE FENNSYLVANICA (p. 73). 

 S* 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. 

 0. Sepals and petals in fours or sixes. 

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

 Blue Cohosh, CAULOFHYLLTIM THALICTROIDES (p. 67). 

 p. Sepals 'and petals in fours (Crucifers). 

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

 r. Underground stems tuberous; leaves entire or sparingly 

 ■ toothed. 



Spring Cress, CARDAMINE DOUGLASII (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). 

 0, Sepals and petals in fives. 



■p. Leaves compound (3-foliolate) ; underground stem bulbous 

 (flowers pink to purple). 



Violet Wood Sorkel. OXALIS VIOLACEA (p. 85). 



