72 



CRUCIFERAE (MUSTARD FAMILY) 



The fruiting pedicels are short and thick and the pods are smooth, 4 

 cm. long. Introduced from Europe. 



B. nigra, Black Mustard. Leaves slender, petioled and somewhat 

 hairy, the lower ones having a very large terminal lobe and a few 

 small lateral ones. The pods short, 1.5-1.8 cm. long, on short erect 

 pedicels, flattened. The seeds are dark and very pungent. Common 

 along roadsides and in waste places. Introduced from Europe. 



Mostly biennials, 

 somewhat 4-sided. 



BARBAREA 



Flowers yellow. Pods linear, round or 



B. vulgaris. Winter Cress. A smooth perennial. The lower leaves 

 lyrate, the terminal division round and usually large. The lateral 

 divisions 1-4. The upper leaves obovate, cut-toothed, or pinnatifid at 

 the base. Flowers bright yellow. Pods erect or ascending on spread- 

 ing pedicels. Low grounds and roadsides. 



DENTARIA 



Herbs with long, horizontal, fleshy and pungent rootstocks. 

 Simple stems naked below and bearing 2 or 3 petioled, compound 



leaves about or above the middle, and 

 terminated by a single cluster of large 

 white or purple flowers, and lanceolate 

 flat pods. 



D. diphylla, Toothwort. Rootstock 

 long and continuous, often branched; 

 stem-leaves 2, similar to the basal ones; 

 leaflets rhombic-ovate or oblong-ovate, 

 coarsely crenate, the teeth abruptly acute;' 

 flowers white. Rich woods. 



D. laciniata, Toothwort. Rootstock 

 tuberous, deep-seated; basal leaves, often 

 none; stem-leaves 3-parted, the lateral 

 segments often 2-lobed, all broadly ob- 

 long to linear, more or less gash-toothed ; flowers white or rose-color. 

 Rich woods. 



Dentaria laciniata, Toothwort. 



