268 CLASS XV. ORDER II. 



end. Stamens nearly equal, longer than the calyx. Stigma 

 concave. Silicles smooth, roundish, consisting of two one-seed- 

 ed joints, the lower one somewhat globular, without teeth or 

 prominences, marked on each side with a longitudinal, depressed 

 line, sometimes abortive. Upper joint ovate, round, marked on 

 each side with an elevated line, terminating in a flat, emargin- 

 ate, or three toothed beak. Seeds facing different ways. The 

 silicle is drupaceous, and in drying becomes quadrangular. The 

 plant is succulent and heavy.— Grows abundantly at Cape Ann. 

 Found also at South Boston. — July. — Annual. 



288. COCHLEARIA. 

 CocHLEARiA ARMORACiA. L. Horse rciclisTi. 



Root leaves roundish, stem leaves oblong, somewhat 

 sjnuated ; silicles globose. 



Common horse radish is naturalized in various places, about 

 roads and old gardens. The root leaves are on long petioles, 

 those of the stem sessile. The stalks are in corymbs of numer- 

 ous white flowers. — May, June. 



2S9. CAMELINA. 



Camelina sativa. Crantz. Common Camelina. 



Si/n. Myagrum sativum. L. 



Allyssum sativum. Smith. 



Stem herbaceous ; leaves lanceolate, sagittate, 

 clasping ; corymbs terminal, racemose ; silicle obo- 

 vate. 



An annual plant, introduced from Europe. Stem a foot and a 

 half high, round, leafy. Leaves alternate lanceolate, obsoletely 

 toothed, roughish, arrow shaped at base. Corymb made up of 

 long racemes, with numerous small yellow flowers. Calyx 

 spreading. Petals obtuse. Silicles erect, obovate, inflated, 

 smooth, crowned with the style, which is about half as long as 

 the silicle, — Roads and cultivated grounds. — June, July. 



