326 The Ohio Joiirval of Science [Vol. XVII, No. 8, 



Perennials in wet meadows and along streams, blooming 

 two or three weeks later than C. douglassii. Indigenous and 

 general. 



3. Cardamine rotundifolia Mx. Round-leaf Bitter-cress. 

 Stems branching, stolonif erous ; leaves ranging from petioled 

 at the base to sessile near the end of the stem, oval, undulate or 

 entire, often cordate, 1 in. broad, occasionally with a pair of 

 small leaflets on the lower petioles; pods linear, pointed, ^-f in. 

 long. 



Indigenous perennials in cool springs or shallow shaded 

 streams. Belmont, Noble. 



4. Cardamine pratensis L. Meadow Bitter-cress. Stem 

 from a short rootstock, 8 in. to 2 ft. high, nearly simple; leaves 

 pinnately divided; leaflets 7-15, dentate or entire, the lower 

 large, broad and petioled, the upper sessile and narrow; petals 

 white or rose-color, three times the length of the sepals; pods 

 f-1^ in. long, style thick. 



Perennials in wet meadows or bogs, introduced from Europe 

 but indigenous in the North and Northwest. Portage County. 



5. Cardamine hirsuta L. Hairy Bitter-cress. Stem nearly 

 simple, 4-10 in. high; leaves chiefly basal, 1-4 in. long; leaflets 

 5-11, somewhat pubescent on the upper surface, the terminal 

 segment orbicular, entire or few-toothed, larger than the 

 lateral segments; stem-leaves, if any, much reduced; pods 

 linear, appressed, 1 in. long. 



Annual or biennial in waste places. Perhaps introduced 

 from Europe. Lake County. 



G. Cardamine pennsylvanica Muhl. Pennsylvania Bitter- 

 cress. Stems usually much branched, 8 in. to 3 ft. tall, some- 

 what fleshy, leafy; basal leaves 2-6 in. long, larger and broader 

 then the stem-leaves, segments 7-11, the terminal part obovate, 

 all more or less confluent along the rachis; racemes lateral 

 and terminal; pods linear, 1 in. long. 



Indigenous annual, or biennial in damp places. General. 



7. Cardamine arenicola Britt. Sand Bitter-cress. Stem 

 much branched from the base, leafy, 6-12 in. high; leaves with 

 numerous linear divisions, usually entire, the basal leaves 

 slightly larger; pods erect, less than 1 in. long. 



Indigenous annuals in wet sandy soil. Perhaps a form of 

 C. parviflora. Lake County. 



