Botany. 63 



SINAPIS, L. (MUSTARDS). 



137. S. nigra,L. (BRASSICA NIGRA, Koch. ; B. SINAPIOIDES, Roth.), 

 BLACK MUSTARD, 6 9, A. Arable fields, ditches, etc. ; 

 frequent. 



1. All over the Thames Marshes. Dod. 



139. S. arvensis, L. (B. SINAPISTRUM, Boiss. ; B. SINAPIS, Vis.), 



CHARLOCK, 5 9, A. A v. abundant weed of cultivation. 



140. S. alba, L. (WHITE MUSTARD), 5 7, A. Colonist ; a relic of 



cultiv. only. Seedlings used with " Cress " (LEPIDIUM 

 SATIVUM) in " Mustard and Cress." 



(43) DIPLOTAXIS. DC. (ROCKET). 



142. D. tenuifolia, DC. (SINAPIS Sm. ; BRASSICA, Boiss.), 69, P. 



Old walls, etc., nr. the sea ; when inland prob. a denizen. 



1. Belvedere. Webb. 



2. Railwav bank, St. Mary Cray ; Woolwich Ars. Dod. 



3. Abt. in Charlton Pit, '07. R.H.C. and C.H.G. 



a. Charlton Chalk-pit (1836), Greenhithe Chalk-pit ('35), 

 Northfleet ('77). 



143. D. muralis, DC. (BRASSICA Boiss. ; B. BREVIPES, Syme), 



5 9, A. or B. Colonist ; fields and waste places ; common. 

 1. Garden plot, Chelsfield Rly. Stn., '04. W.H.G. 



var. b.) Babingtonii, Syme. 



1. Plumstead, Dartford (often growing with the type). 



Dod. 



The variety is more common, esp. on the chalk, than the 

 type. The var. has strong side branches from which the 

 fl. peduncles come ; in the type the peduncles arise from 

 the main axis. 



144. CAPSELL A bursa-pastoris, Mcench, (BURSA PASTORIS, Weber), 



SHEPHERD'S PURSE, 3 11, A. Waste ground everywhere. 

 Fls. self-fertilised. The pi. is often attacked by a yellow 

 rust (CYSTOPUS CANDID us). According to Willis, the fls. 

 may be bi-sexual or /., or both. 



(45) CORONOPUS. Rupp. (SENEBIERA, Poir.). 



145. C. didymus, Sm. (S. DIDYMA, Pers.), 7 9, A. A seacoast 

 straggler. 



1. Woolwich Arsenal, '92. Dod. 



