SPECIES AND VARIETIES. 45 



(9) Barbarea. WINTER-CRESS. 



B. vulgaris : stem erect ; lower leaves lyrate, with a broad 

 rounded terminal lobe; flowers, small, yellow, racemed. - 

 Belleisle Cress or Yellow Rocket. Waste places. Fl. May to 

 July. 



(10) Arabis. ROCK-CRESS. 



A. Thaliana : annual ; stem slender, erect ; lower leaves 

 stalked, oblong, with a few coarse teeth, upper few, small, ses- 

 sile; flowers small, white. Thale-cress. Banks and waste 

 places. Fl. April. 



A. Turrita : biennial ; stem stiff, erect ; lower leaves stalked, 

 upper sessile, stem-clasping, oblong-lanceolate, slightly toothed; 

 flower small, whitish. Tower-cress. Walls, rare. Fl. May. 



(11) Cardamine. BITTER-CRESS. 



C. amara : sterns weak, ascending ; leaves pinnate with 5-7 

 large ovate or orbicular segments, the upper ones angular 

 toothed; flowers largish, white, in few-flowered racemes. 

 Sides of streams and watercourses. Fl. April, May. 



C. pratensis : stems stiff, erect ; leaves pinnate the seg- 

 ments of the lower roundish, those of the upper ones narrow 

 and entire ; flowers largish, pale pink or blush-coloured. 

 Ladies' -smock or Cuckoo-flower. Moist meadows. Fl. 

 April, May. 



C. hirsuta : stems ascending or erect, more or less hairy ; 

 leaves pinnate, with small roundish-oblong angularly toothed 

 segments; flowers small, white. Moist shady places. Fl. 

 March to June. 



(12) Alliaria. GARLIC MUSTARD. 

 A. officinalis : annual or biennial ; stem erect ; lower leaves 



