SPECIES AND VARIETIES. 193 



deeply pinnatifid^ with few lanceolate toothed lobes, the ter- 

 minal one 1-li inch long, the others often directed backwards 

 towards the stem, upper leaves sometimes undivided and 

 hastate ; flowers very small, yellow ; pods half an inch long, 

 tapering to the point, almost sessile, and closely pressed against 

 the axis in long, slender racemes, the midribs of the valve 3 

 prominent. — Hedge Mustard. — Waste places, by roadsides. 

 Fl. June, July. 



S. Irio : annual; stem a foot high or more, erect, hard, 

 glabrous ; leaves deeply pinnatifid or pinnate, the lobes or 

 segments lanceolate, more numerous and larger than in the 

 former ; flowers small, yellow ; pods 1 ^-2 inches long, form- 

 ing dense racemes. — London Rocket. — Waste places, chiefly 

 about London and other towns. Fl. July, August. 



** Leaves 2-3 times pinnate. 



S. Sophia : annual ; stem a foot high or more, erect, slender, 

 somewhat hoary with very short down; leaves divided into 

 numerous short linear segments; flowers small, yellow; pods 

 slender, glabrous, |— 1 inch long, forming loose erect racemes. 

 — Flixweed. — Waste places. Fl. July to September. 



(22) Nasturtium. Water-cress. 



* Flowers ivliite. 



N. oflacinale : stem much branched, short and creeping, or 

 floating in shallow water ; leaves pinnate, with distinct seg- 

 ments, the terminal one usually larger, ovate or orbicular; 

 flowers small, white, in short racemes ; pods 6-8 lines long, 

 on spreading pedicels, slightly curved upwards. — The com- 

 mon edible Water-cress. — Brooks and rivulets. Fl. all the 

 Summer. 



