5° 



CRUCfFERJE 



Two other small species allied to C. ddnica, C. grcenldndica, 

 with fleshy leaves, and C. micdcea, a perennial with long claws 

 to its relatively large petals, are found in the north of Scotland. 



1 8. Armoracia (Horse-radish).— Perennial glabrous herbs, 



with rhizomes ; flowers 

 small, white or yellow ; 

 pods short, broad, nearly- 

 globose, with no dorsal 

 veins. (Name of uncertain 

 origin.) 



i. A. rusticdna (Horse- 

 radish). — Rhizome stout, 

 long, cylindric, white and 

 pungent ; branches 2 — 3 

 feet high ; radical leaves 

 8 — 12 in. long, on stalks a 

 foot long, oblong, wavy, 

 crenate ; cauline leaves sub- 

 sessile, lanceolate, serrate ; 

 flowers small ; pods not 

 ripening in England. — 

 Waste-ground; a common 

 escape from kitchen gar- 

 dens ; but not indigenous. 

 — Fl. May — June. Perennial. 

 2. A. amphibia (Amphi- 

 bious Yellow Cress). — 

 Roots fibrous ; rhizome 

 short, stoloniferous ; leaves 

 pinnatifid or deeply serrate ; 

 petals, twice as long as the 

 calyx. — A large plant, 2 — 4 

 feet high, growing on the 

 banks of rivers, or partly 

 submerged, remarkable for 

 its numerous runners or 



ochleAria officinalis {Common Scurvy-Grass). 



stolons. — Fl. June— September. Perennial. 



*iq. Camelina sativa (Gold of Pleasure) is another escape 

 from cultivation. It has tall, slender stems ; with obtuse, auricled 

 cauline leaves ; small yellow flowers and obovoid inflated pods. — 

 Fl. June, July. Annual. (Name from the Greek chatnai, dwarf, 

 linon, flax.) The plant is cultivated for the oil in its seeds. 



