194 SUMMER FLOWERS. 



** Flowers yellow. 

 t Fods half an inch long or more. 



N. sylvestre : stem creeping, the flowering branches erect 

 or ascending, a foot high or more ; leaves deeply pinnatifid or 

 almost pinnate, the lower lobes distinct and narrow, the ter- 

 minal one often larger and broader ; flowers small, yellow, the 

 petals twice as long as the calyx ; pod slender. — River-banks 

 and wet places. Fl. June to September. 



f f Pods not exceeding a quainter of an inch in length. 



N. palustre : stem creeping, but weaker and not so tall as 

 the last ; leaves deeply pinnatifid, the lobes broader and more 

 toothed; flowers small, yellow, the petals seldom exceeding 

 the calyx ; pod about three lines long, slightly curved. — Muddy 

 and watery places. Fl. June to September. 



N. amphibium : stem 2-3 feet, erect ; leaves narrow lan- 

 ceolate, 3-4 inches long, slightly toothed, more frequently 

 deeply toothed or lobed, sometimes divided to the midrib into 

 narrow segments ; flowers yellow, the petals longer than the 

 calyx : pod straight, elliptical, about two lines long. — Moist 

 meadows and watery places. Fl. June to August. 



(23) Barbarea. Winter-cress. 



B. striata : biennial ; stem 1-2 feet long ; leaves lyrate, the 

 upper pair of lobes small, much narrower than the large 

 oblong -ovate terminal lobe, uppermost undivided, toothed; 

 flowers small, yellow, the flowering raceme close ; pods straight, 

 adpressed. — Yellow Rocket. — Hedges. Fl. May to August. 



B. prsecox : biennial ; stem 1-2 feet long, slender ; leaves 

 lyrate, the upper pair of lobes as broad as the roundish sub- 

 cordate terminal lobe, uppermost pinnatifid, with linear-oblong 



