190 M. De CandoUe on the Species and Varieties 



name of Reps ohl, which is particularly used for lamps, after 

 having undergone the necessary pi-ocess of purification by 

 Thenard's method." At present we know of no variety of the 

 Brassica prcvcox, having a fleshy and tuberous root, as in the 

 preceding species; but it is probable from analogy that it might 

 be susceptible of the same development. 



Messrs. Waldstein and Kitaibel * think that the Brassica 

 elongaia might be cultivated with success as an oleiferous 

 plant. This species, known by the extraordinary peduncle of 

 the seed-pod rising above the discus, has several chances of 

 succeeding; in the first place, it is of a robust nature, and 

 thrives in tolerably good ground; secondly, it yields seed 

 abundantly; thirdly, its seed-pods are slow in opening, so 

 that the seeds which ripen first are not lost, while the rest are 

 ripening ; this species is cultivated in some parts of Hungary, 

 and I mention it here to attract the attention of botanists and 

 cultivators to it, as a novelty. 



In order to prevent confusion of nomenclature, I shall here 

 mention a few species of the Neighbouring Genera that have 

 been popularly confounded with the preceding. Of these the 

 First is the Moidardc blanche, Sinapis alba (White Mustard)f ; 

 it is cultivated in the Vosges, under the name ofNavette d'Ete, 

 but can in nowise be confounded with the plant that more ge- 

 nerally bears this name ; the leaves are more deeply divided, 

 and have their lobes more indented, but, above all, the seed- 

 pod is short, hispid, and terminated with a kind of depressed 

 horn, in the shape of a dagger ; it contains but a small quan- 

 tity of seeds, and these are of a pale colour. It is generally 

 employed for making mustard, but, as I before observed, it is 

 cultivated in some parts of France as an oleiferous plant, 

 under the name of Nave(te d'Ete, and sometimes it is called 

 Graine de Beiirre. 



The next is the Camelina sativa\, which is likewise desig- 

 nated in some provinces by the names of Navette d'Et^, and 

 Graine de Beurre ; in other places, from a curious confusion 

 of terms, it is called Camomillc! ; the Belgians name it Door ; 

 the Alsacians, Dotterle; the Germans, Dotter ; and the Ita- 

 lians, Dorella. Next to the true Colsa this is the most produc- 



* Waldstein & Kitaibel Plant, ra'r. Hung. vol. i. page 2(5, tab. 28. 



\ See De Candolle Reg. Veg. Syst. Nat. vol. ii. page 620. Smith Flora 

 Brilannlca, vol. ii. page 721. English Botany, plate 1677. Martyn Flora 

 Riistica, vol. ii. plate 70. 



X See De Candolle Reg. Veg. St/st. Nat. vol. ii. page 515. Myagnim 

 sativtim, Linn. Sp. Plant, ed. 2. vol. ii. page 894. Ali/ssum taiivum, 

 Smith Flora Britannicn, vol, ii. page 67!), and English Botan;/, plate 125t. 



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