396 TETRADYNAMIA SILIQUOSA. 



stem branched, hairy at the base, siliques ascending ; pedicels much 



longer than the calyx. 

 HAB. Dry hills. April May, <v) ; stem 2 4 inches high, e^ect ; 



siliq. slender. 

 A. lyrata: stem and upper leaves smooth and glaucous; radical 



leaves lyrate-pinnatifid, often pilose ; stem branched at the base ; 



pedicels spreading ; silique erect. 

 HAB. Rocky hills. April July, J 1 ; stem 812 in. high; c-aul. 



leaves I in, ; Jl. Large. 

 A. Icevigaia: stem leaves linear, oblong, sagittate, s='nooth; the lower 



ones subdentate ; radical ones obovate ; pedicels erect ; siliques very 



narrow and long, at length pendulous. 

 HAB. Rocky hills. May, 1\. ; stem 2 feet high ; sit. 2$ in. long ; 



root nerved. 



A. canadensis : stem leaves sessile, oblong-lanceolate, narrow at the 

 base, pubescent, pedicels pubescent, reflexed in the fruit ; siliques 

 pendulous, sub falcate, nerved. 



HAB. Rocky hills. June 7J. ; stem 2 feet high ; ped. 3 times as long 

 as the cat. 



294. BARBAREA. Winter-cress. 



B. vulgar is : lower leaves lyrate ; terminal lobe roundish ; upper ones 

 obovate, dentate. 



HAB. Old fields. June, 7J.; stem 12 feet high, smooth; leaves 

 very sm. ; Jl. yell. 



295. NASTURTIUM. Nasturtium. 



N. offlcinale : leaves pinnate ; leaflets ovate, subcordate, repand. 

 HAB. In water. June July, %.\ stems decumb. ; term, leaflets 



large ; fl. wh. 

 N. amphibium: leaves oblong-lanceolate, pinnatifid or serrate; root 



fibrous ; petals longer than the calyx ; siliques elliptical. 

 HAB. Wet places. June July, fa stem 12 feet high; Jlowei 



yell. ; sil. subrcjlex. 



296 SISYMBRIUM. Hedge-mustard. 



S. officinale : leaves runcinate, and with the stem, hairy ; siliques sub- 

 ulate, appressed. 



HAB. Fields. June Oct. <v) ; stem 12 feet high, branch. ; Jl. 

 minute, yell. 



S. sophia: leaves bipinnate ; segments oblong-linear, incised; petals 

 shorter than the calyx ; calyx twice as short as the pedicel. 



HAB. Sandy fields. July, ; stem 812 in. high; leaves sm. or 

 pubes. ; Jl. yell. 



297. SINAPIS. Mustard. 



8. nigra : siliques smooth and even, subquadrangular, appressed , in- 

 ferior leaves lyrate; upper ones lanceolate, entire, petiolate. 



