34 PLANTS OF MASSACHUSETTS. 



S. alba. L. White or Yellow Mustard, has a great resem- 

 blance to the other, but is different, and more rarely cultivated. 



From the Greek name of the plant of nearly the same sound ; 

 mustard is from the Latin for hot must. Loudon. 



Erysimum. L. 13. 2. 



E. officinale. L. Hedge Mustard ; grows about gardens, 

 and beside fences ; resembles mustard, but is a smaller and more 

 diffusely branched, and more rough and ragged in its appearance. 

 Stem 2 feet high, and leaves runcinate, or lion-toothed ; flowers 

 from June to September. Its properties of little value. Sup- 

 posed to be healthful, and named from the Greek, to cure. 



Thlaspi. L. 13. 2. 



T. bursa-pastoris. L. Shepherd's Purse, so plentiful about 

 gardens and in roads and fields, is known by its triangular, wedge- 

 form, obcordate capsule, and its radical leaves pinnatifid. April 

 to October. Introduced. 



T. campestris. L. Yellow Seed. Found in the fields, and 

 especially among flax, with the seed of which it was probably 

 brought from Europe ; its capsule is inflated and obcordate ; 

 stem-leaves dentate and sagittate ; flowers in June. 



Both species are mere weeds ; from the Greek, to compress, 

 from the flattened fruit or seed. Loudon. 



Raphanus. L. 14. 2. 



R. raphanistrum. L. Cudloch. Wild Radish. A very 

 troublesome plant in cultivated fields, rough, bristly, glaucous, 

 with lyrate leaves ; stem two feet high ; flowers in August ; in- 

 troduced, but naturalized in the woods of Chelsea Beach Island. 

 Big. 



R. sativus. L. Radish ; cultivated for its root, of various 

 forms, taper -form, turnip, &c, and used as a relish, from its 

 pleasant spicy taste. 



From the Greek, for rapidly appearing, on account of its rapid 

 growth. Loudon. 



