TETRADYNAMIA.— SILIQUOSA. 251 



HAB. Rocky hills. June. U. Stem 2 ft. high; 

 ped. 3 times as long as cal. 



420. BARBAREA. Winter-cress. Cruciferce. 



B. vulgaris: lower leaves lyrate ; terminal lobe 

 roundish ; upper ones obovate, dentate. 



IIAB. Old fields. June. U. Stem I— 2 ft. high* 

 smooth, leav. very sm. ; fl. yell. 



421. NASTURTIUM. Nasturtium. Crucifer*. 



1. N. officinale: leaves pinnate; leaflets ovate, sub- 



cordate, repand. 

 HAB. In water. June — July. U . Stems decumb. 

 term, leafl. large ; fl. wh. 



2. N. palustre : leaves lyrate-pinnatifid ; lobes conflu- 



ent, unequally dentate, smooth ; petals as long as 

 the calyx ; siliques short, turgid ; root fusiform. 

 HAB. Wet places. July. ©. Stem U ft. high, 

 fl. yell. ; pedicel short. 

 5. N. amphibium : leaves oblong-lanceolate, pinnatifid 

 or serrate ; root fibrous ; petals longer than the 

 calyx ; siliques elliptical. 

 HAB. Wet places. June— July. U. Stem 1—2 

 ft. high ; fl. yell. ; sil. subreflex. 



122. SISYMBRIUM. Hedge-mustard. Crucifem. 



'!. S. officinale: leaves runcinate, and with the stem, 

 hairy : siliques subulate, appressed. 

 HAB. Fields. June— Oct. 0. Stem 1—2 ft. 

 high, branch. ; fl. minute, yell. 

 J. S. Sophia: leaves bipinnatc ; segments oblong-li- 

 near, incised ; petals shorter than the calyx ; 

 calyx twice as short as the pedicel. 

 HAB. Sandy fields. July. ©. Stem 8—1. 

 high ; leav. sm. or pubes. ; fl. yell. 



423. HESPERIS. Dame's violet. Crucifercc. 



II I pinnatifida : leaves acutely serrate ; superior 

 ones lanceolate; inferior spinnatifid-Iy rate : pedicel, 

 at length longer than the calyx. 



