June, 1917] The BrassicacecB of Ohio 327 



8. Cardamine parviflora L. Small-flowered Bitter-cress. 

 Stem erect or ascending, branching, 2-15 in. high, very slender, 

 with scattered leaves; leaves with 5-11 segments, oblong or 

 linear, the terminal ones often rounded, basal leaves largest; 

 flowers scarcely a line broad; pods slender, scarcely 1 in. long, 

 on a somewhat zigzag peduncle. 



Indigenous annuals or biennials, in dry, rock}^ or barren 

 soil. Delaware, Fairfield, Hocking, Lawrence. 



28. Dentaria (Tourn.) L. Toothwort. 



Perennial, mostly glabrous herbs, with scaly or toothed root- 

 stocks of a pungent taste. Stems leafless below, leaves 2 or 3, 

 palmately parted or compound. Flowers white or purplish, in a 

 short raceme or corymb. Siliques linear, flat, dehiscent from 

 the base. Seeds oval, wingless, in 1 row in each cavity. 



1. Basal and stem-leaves similar. 2. 



1. Basal and stem-leaves different; rootstock jointed. D. heterophylla. 



2. Stem-leaves 2, opposite; rootstock continuous. 3. 



2. Stem-leaves usually 3; rootstock jointed. 4. 



3. Leaf segments ovate or ovate-oblong. D. diphylla. 



3. Leaf segments linear. D. miiltifida. 



4. Leaves alternate, sometimes 2-7. D. maxima. 

 4. Leaves whorled. D. laciniata. 



1. Dentaria diphylla Mx. Two-leaf Toothwort. Stem 

 stout, erect, glabrous, 8-12 in. high, from a continuous toothed 

 rootstock; basal leaves long-petioled, 4-5 in. broad, ternate, 

 ovate, dentate, often found in winter; stem-leaves similar, 2, 

 opposite; flowers white, petals twice the length of the sepals; 

 pods 1 in. long, but seldom maturing. 



Indigenous in woods and meadows. Eastern half of the 

 state. 



2. Dentaria maxima Nutt. Large Toothwort. Similar 

 to D. diphylla, but larger. Rootstock interrupted, tubercled; 

 leaves 2-7 (usually 3), alternate; flowers sometimes purple- 

 tinged. 



Indigenous in damp woods, but local. No specimens. 



3. Dentaria heterophylla Nutt. Slender Toothwort. Stem 

 slender, scapose, glabrous or slightly pubescent; rootstock 

 jointed, near the surface; whole plant purplish, flowers deepest; 

 stem-leaves generally 2, opposite, ternate, divisions linear, 

 entire, 1-1^ in. long; flowers few; pods 1 in. long, ascending. 



