28 CRUCIFER/E. [Brassica. 



Tribe IX. Brassicece. De Cand. 



Siliqua dehiscing lengthwise. Septum linear. Seeds globose. Coty- 

 ledons folded together. 



19. Brassica. Linn. Cabbage, Turnep. 



Pod 2-valved (with a sterile, one, or many-seeded beak). Co- 

 tyledons conduplicate (O > > ). Calyx erect. Br. — Name de- 

 rived from the Celtic Bressic, a Cabbage, according to Theis. 



Tetradynamia. Siliquosa. 



1. B. Napus, Linn. Wild JVavew, Rape or Cole-seed. Root 

 spindle-shaped ; leaves smooth ; upper ones cordato-lanceolate, 

 heart shaped at their base, clasping the stem ; lower ones lyrate, 

 toothed. Br. Fl. 1. p. 303. E. Fl. v. iii. p. 217. E. Bot. t. 

 2146. 



Corn fields and waste grounds, frequent. Fl. May, June. $ . — 

 One to two feet high. Lobes of the lower leaves crenate ; upper 

 leaves entire, somewhat glaucous. Petals yellow, rather small. Pods 

 torulose. Cultivated for the oil produced by its seeds, which, after 

 pressure, are formed into cakes, and found useful for manure and feeding 

 of cattle. 



2. B. Rapa, Linn. Common Turnep. Root fleshy, orbicular, 

 depressed ; radicle leaves lyrate, rough, those of the stem nearly 

 entire. Br. Fl. 1. p. 308. E. Fl. v. iii. p. 217. E. Bot. t. 

 2176. 



Borders of fields and waste places. Very common about Dublin, 

 often mistaken for the last, but may be readily distinguished by its 

 larger flowers, which are of a much brighter yellow, and more orbicular 

 roots. Fl. April, May. $ . — Varying exceedingly in height according 

 to soil. Upper leaves amplexicaul, ovate-acuminate, somewhat glau- 

 cous ; all more or less toothed. Flowers yellow, rather large. 



3. B. campestris, Linn. Common Wild Navew. Root taper- 

 ing ; radicle leaves lyrate, rough ; stem leaves smooth, clasping, 

 oblong, partly pinnatifid ; all somewhat glaucous. Smith. — Br. 

 Fl. 1. p. 308. E. Fl. v. iii. p. 218. E. Bot. t. 2234. 



Corn fields near Dundrum, 1805, and near the village of Faughan, 

 County of Donegal ; Mr. Templeton. Fl. June, July. ©.— Root 

 fusiform, but slender. Stem hispid below. Flowers yellow. Pods 

 upright, cylindrical, or obscurely four-angular, veiny ; the seeds^ forming 

 slight prominences ; the beak awl-shaped, striated, square at its base. 



4. B. oleracea, Linn. Sea Cabbage. Root cylindrical, fleshy ; 

 leaves glaucous, waved, lobed, partly lyrate, all perfectly- 

 smooth ; pod without a beak. Br. Fl. 1. p. 308. E. Fl. v. iii. 

 v. 219. E. Bot. t. 637. 



Cliffs by the sea. On the cliffs near Youghal, sparingly ; Mr. J. 

 Drummond. Fl. May, June. $ ■ Varying in height, 1 — 2 feet. 



