3S 



CRUcfFER*; 



mcilia. — A variety with double Ilowers is fre([iient in gardens under 

 the name of \'ellow Rocket. — Y\. May — August. Biennial. 



2.* B. venia (American Cress), differing in a more slender 

 habit, narrower leaves, larger/Zr'it'fVj- in a closer raceme and longer 

 pods, and flowering earlier, is a common garden escape, being 

 grown as a salad. 



5. Araris (Rock Cress). — Herbs growing in dry places, mostly 

 local in Britain; radical leaves spathulate; //ozt'^rj small; sepals 



short ; pelals clawed ; pods 

 linear, compressed, keeled, 

 not elastic. (Name from 

 Arabia, the native country 

 ot'several of the species.) 



T. A. alphia (Alpine 

 Rock Cress). — A low-grow- 

 ing plant, with its caitline 

 leaves downy with branched 

 hairs, lanceolate, acute, 

 amplexicaul, toothed, and 

 its pflds erect, on spread- 

 ing hairy stalks, occurs on 

 the Cuchullin Mountains 

 ill the Isle of Skye. Peren- 

 nial. 



2. A. petrcta (Mountain 

 Rock Cress). — Generally 

 glabrous ; stem 3 — S in. 

 liigh, branched below ; 

 radical leaves lyrately pin- 

 iratifid ; catiliiic leaves sub- 

 entire, stalked ; flowers 

 corymbose, white, tinged with jnirple. -'^C)n rocks in Wales and 

 Scotland, — Fl. June — August. Perennial. 



3. A. scdira (Bristol Rock Cress), with hispid, sinuate dentate 

 radical leaves, sessile cai/line leaves and creani-coloured ll'ioers, 

 grows on limestone rocks at Bristol and Cheddar. — Fl. March 

 May. Perennial. 



4. A. cilidla (Ciliate Rock Cress), with leaves smooth on both 

 sides, but fringed with forked hairs at the edges, and white 



y?07fv;-,r, grows on rocks by the sea near 'Tenb\', and in tlie south 

 and West ol Ireland. — Fl. July, August. Perenniak 



5. A. hirsiita {Wm)< Rock (_'ress). — llispid ; slenis many, about 

 1 foot high, witli numerous caiili/ie leaves, heart-sha|ied at the base 



