Manchester Memoirs, Vol. liv. (1910), No. 15. 3 



how many cruciferous aliens make their appearance in 

 these Hsts. 



Sinapis jnnccn, Linn. This is an unlocked for species, 

 although it has occasionally been reported in European 

 floras. It occurred in profusion over many portions of 

 the St. Anne's sandhills, and I had it under observation 

 for several summers, without being able to associate it 

 with any plant then known to me. It grew on a cinder 

 path on the south side of my old residence (Atherstone 

 House) ; other portions of the sandhills produced a more 

 fleshy plant, which I was a long time in connecting with 

 the plant of the cinder walk. Upon searching my herba- 

 rium for its counterpart, it seemed best to agree with 

 examples of ^. juncea, from Swinemiinde, in Pomerania, 

 collected there in August, 1889, July and August, 1890, 

 and August, 1892 — the latter under the synonym of 

 Brassica Willdenovii, Boiss. ; it has been reported at 

 Port Juvenal, in France, by Spach, and is one of the oil 

 plants of China and Japan. Doubt, however, attached to 

 this determination of the St. Anne's plant, on account of 

 its lacking the "ramis fasciculatis " of the 'Prodromus' 

 (vol. I, p. 218). In the summer of 1908 there reached 

 me a plant, which required a name, from Mr. James E. 

 Macdonald, of Heaton Norris, and the specimen sent 

 furnished the fasciculate branches given as one of the 

 characters in the ' Prodromus ' ; under the name of 

 S. juncea, Linn., I distributed numerous examples through 

 the Botanical Exchange Clubs. At the date of de Can- 

 dolle's work (1824) it is described as a Chinese plant 

 growing in Egypt in fields of Trifolitim Alexandrimnn. 

 It is right to add, however, that some British botanists 

 regard the St. Anne's plant as being only Sinapis nigra, 

 Linn., but in St. Anne's — where S. nigra is abundant — 



