CRUCIFER^. 27 



Dr. Jacob, after giving the stations that have his name attached, 

 speaks of this as "by no means common elsewhere." That Avas over 

 forty years ago ; it is now thoroughly established in many other spots, 

 appearmg at them year after year. It is probable that even in Dr. 

 Jacob's time it was more generally diffused than he supposed. 



First record : Jacob, 1835. 



NASTUETIUM, R. Brown. 



55 N. officinale, Brown. Water Cress. 



Native ; in and by streams, rills, and ditches. Very common. 

 June to September. Area general. 

 The 'var. siifolium^ seems to be only a form or state of the plant 

 dependent on luxuriance. 



56. N. sylvestre, Brown. Creeping Yellow Cress. 



Native ; in rocky or stony places by rivers, and in damp ground. 

 Very rare. June to September. 

 D. III. Banks of the Tavy, near Maristow; Jacob, Fl. part 12; refound I 

 1875, Mr. F. H. Goulding. I have also seen it in the bed of 

 the Tavy at Tavistock, a little beyond the area. By the 

 Walkham at Double Water, very sparmgly, 1862 ; perhaps 

 now extinct. In plenty over many square yards of ground in 

 the new Stoke Damerel Cemetery ; apparently indigenous, but 

 overlooked in the damp marshy field until it was laid out for 

 a burying-ground, and drauied : discovered by my brother. 

 Major Briggs, in 1877. 

 First record : Jacob, 1836. 



57. N. palustre, D.C. 



Native ] Extinct ? No recent record, 

 c. I. Banks of the Lynher (Notter), near St. Germans ; Jacob, Fl. 

 part 12. 

 II. Branches of the Tamar ; Rev. C. A. Johns and Dr. Jacob; 

 Pascoe in Bot. Gaz. ii. 38 ; vnt\\ a mark attached to indicate 

 his having seen a dried specimen there. Mr. Pascoe may have 

 included the record for District i. in this statement. 

 First record : Jacob, 1836. 



ARMORACIA, Fl. der Wett. 



58. A rusticana, Bab. Blan. Horse Radish. 



Alien ; ahvays as a garden outcast ; or in spots where it was 

 origmally planted. Rather rare. June, 

 c. I. By a hedge-bank bounding a garden-plot, Antony ; waste spot, 

 Tideford. Sparingly at both spots. 



