262 Mr Arnott's Tour to the Pyrenees. 



it to be S.erkoides, Poir.), Cyttsus argenteiis, and NigeUa ar- 

 vensis. But there were other plants much more rare, and wliich 

 we had not previously observed in our excursions: one was An- 

 tirrhinum molle, a species closely allied to A. sempervirens, but 

 very distinct : it was exceedingly scarce, and not well in flower. 

 Near it was Stipa parviflora^ Desf. and Delphinium cardiope- 

 talum, DC. We also found Lavandula pyrenaica in great 

 abundance, and Alyssum alpestre, 



I may here take the opportunity of observing, that when I 

 first saw Mr Brown's amended character of the genus Alyssum 

 in the Appendix to Denham and Clapperton's Narrative, it ap- 

 peared to me, by the paragraph " ad Alyssum sic constitutum 

 et herbas plerumque annuas pube stellari foliisque integerrimis 

 complectens pertinent A. campestre et calycinum Linn., strigo- 

 sum Russell, minimum Willd., et striatum ejusd. a quo densi/lo- 

 rum Desf. vix differt, fulvescens Sm., umhellatum Desv., ros- 

 tratum Stev., micropetalum Fisch., hirsutum Bieb. aliaeque spe- 

 cies ineditae," that he had the intention of restricting it to these 

 species. Under this impression, I wrote the note printed long 

 after at p. 323. of the Number of this Journal for October last. 

 Having had, however, another opportunity last summer of look- 

 ing over Mr Brown's paper, I felt inclined to attach more im- 

 portance to the word " plerumque," than I had at first done, the 

 few species mentioned by Mr Brown being all of them decidedly 

 annual. On that account, it was my intention to have cancelled 

 the note, as it passed through the press, and to have given in 

 place the following observations, not upon, but in addition to, Mr 

 Brown's remarks ; but this, from my absence last autumn in Rus- 

 sia, I was prevented from doing. 



at the base, but entire above, and tuoice as long as the silicules. This character 

 will at all times distinguish this species, independent of the shape of the sili- 

 cules, which are decidedly globose, and scarcely depressed at the apex. In 

 F. media and officinalis the silicules are decidedly depressed or almost obcor- 

 date. But in F. media the sepals are ovate, lanceolate, acute, much toothed, 

 and scarcely the length of the silicule : in F. officinalis, they are of the same 

 shape and size as in F. media, but nearly entire. That F. capreolata is a good 

 species, I cannot doubt ; but I suspect much that F. media is the F. officinalis, 

 growing in a rich soil. Among fields of potatoes, or in a kitchen-garden, I 

 only find F. media, and when the soil is peculiarly rich, this plant has the 

 leaves as thick and succulent, and the peduncles nearly as cirrhose, as F. cO' 

 preolata. 



