22 CRUCIFERiE. 



D. III. Mutley ! Keys, S. D. Lit. Chron. 385, I have not seen it in the 

 locality for several years ; idem, in Fl. ii. 40. There in 1879 ; 

 but may be soon destroyed by bnildmg. Under the south 

 boundary wall of the Plymouth Cemetery, 1879, and in pre- 

 vious years. Road on the eastern side of Penlee Villas, 

 Stoke Damerel. By a foot-path, Ford, 1867. Near Pounds, 

 1870. Garden in Caroline Place, Stonehouse, 1871. Crownhill, 

 Knackersknowle, 1868 ; also 1871. 

 IV. Catdown ! Keys, S. D. Lit. Chron. 385; also in Thyt. iii. 1024, 

 2^\A Fl. , ibid. In many places around Plymouth, and occa- 

 sionally as a weed in gardens in the toAvn : on a wall at the 

 back of Sherwell House ; in waste ground near West Hoe 

 Terrace, &c. Between Hartley and Compton village. One 

 plant at RidgAvay, August, 1872. On the line of the Great 

 Western Railway at Crabtree, with Linaria supina; the two 

 plants doubtless brought with limestone rubble from Cattedown, 

 1877. 

 At many, perhaps all of the above stations, the plant is the large form, 



Bahingtonii. 

 First record : Keys, 1846 ? (See under D. murcdis.) 



SISYMBRIUM, L. 



43. S. oflB.cinale, Scoi^. Hedge Mustard. 



Native ; in waste spots, by roadsides, and as a weed m cultivated 

 land. Very common. May to October. Area general. 



44. S. Alliaria, Scop. Garlic Hedge Mustard. 



Native ; on hedge-banks and in waste spots. Very common. 

 April to iMay. Area general ; m the immediate neighbour- 

 hood of the town ; at Mutley, Tothill, &c. Biennial. 

 So early m the year as March some plants ^ill be found of large size ; 

 others so small as to have only the cotyledones and a couple of im- 

 mature leaves. Seed shed in the summer does not spring up until the 

 early part of the following year, and the plants produced do not flower 

 until the spring of the succeeding year. The large spring plants are a 

 year in advance of the small ones. 



S. Sox)hia, L. Near Denham Bridge ; Jacob. Fl. Statement uncon- 

 firmed. 



ERYSIMUM, L. 



45 E. cheiranthoides, L. Treacle Hedge Mustard. 



Colonist ; a weed in arable land, and adjacent waste spots. Rare. 

 July to October. 



