CRUCIFER^ 17 



with yellow flowers, and auricled pinnatifid leaves wuth 

 linear segments, grows on dry mountain-sides in Switzer- 

 land. The other Swiss species are also English, and 

 are aquatic or moisture-loving plants of the lowlands, 

 viz.: N. officinale, Br., Watercress, with white flowers; 

 and N. sylvestre, Br. ; palustre, DC. ; and anij. 

 Br. ; all with small yellow flowers. 



4. Barbarea, Br. 



Stigma terminal ; flowers yellow ; sepals equal ; petals 

 clawed ; seed-vessel 4-angled ; seeds in one row. Not 

 alpine. 



B. vulgaris, R.Br., Winter Cress, with its sub-species, 

 is a very common hedgerow plant. 



5. Arabis, L. 



Stigma terminal ; flowers usually white ; seed-vessel 

 linear, compressed ; seeds in one row. 



A. Flowers blue: — A. ccerulea, Hsenke ; a very 

 pretty plant of the High Alps and Dauphiny, with pale 

 blue flowers and long erect seed-vessels. 



B. Flowers pale yellow ; stem-leaves amplexicaul, 

 auricled: — A. perfoliata, Link {Turritis glabra, L.) ; 

 plant nearly glabrous, stem-leaves sagittate, seeds not 

 winged ; stony places. A . Turrita, L. ; plant pubescent, 

 seeds winged ; stony places. 



C. Flowers cream-coloured : — A. stricta^ Huds. ; leaves 

 thick, shining, stem-leaves not amplexicaul ; Saleve, 

 Dauphiny, Pyrenees. 



D. Flowers pink or Hlac: — A. arenosa. Scop.; cal3^x 

 VOL. I. B 



