30 On the different Species, fyc. of the Genus Brassica. 



and I reared from its seeds several individuals resembling the 

 figures given by the ancients. We must not confound the 

 Navette of Dauphiny, with the Alsace Navette; Villars* has 

 described the former under the name of Brassica Napella, 

 but the variety j3, which he has subjoined, appears to me to 

 belong to some other species, which I cannot affirm to be the 

 Colsa, as he mentions that in another article, though he may 

 probably have mistaken it for the Brassica Najms oleifera, 

 which is the true Navette. This Ravette, or Navette of 

 Dauphiny, distinctly separated from every other kind of 

 oleiferous Cabbage by its leaves, which are free from glaucous 

 bloom, and covered with strong bristles, is preferred for cul- 

 tivation in the southern valleys of the mountains of Dauphiny, 

 in a soil unfavourable to every other oleaginous cruciferous 

 plant ; it is less productive than the Colsa, but being of a 

 more hardy nature, is useful notwithstanding ; the seeds are 

 sown after harvest, and ripen in the month of June following. 



Fourth Species. BRASSICA NAPUS. 

 The species to which I give this name, in common with all 

 botanists, though very nearly approaching the Brassica ole- 

 racea, and the Brassica campestris, deserves to be separated 

 from each ; it differs from the Brassica oleracea by a thicker 

 root and more slender stalk, by leaves more generally scol- 

 loped to the mid-rib, and particularly by its expanded 

 calyx. It differs from the Brassica campestris, by its glabrous 

 leaves, which are smooth even in their earliest age, and is 

 unlike both in the size of its seeds, which are little more than 

 half that of the others, also by its seed-pod spreading open 



* ViJlars Histoire des Tlantes tie Dauphine, Vol. iii. page 334. 



