THE NAKKOW- LEAVED WALL MUSTAKD 
247 
Marsh, Bristol, in the year 1878, and since then it 
has greatly increased, and covers all the waste ground. 
The stem of Diplotaxis tenuifolia is about a foot to 
a foot and a half in height, and its narrow, acute, pinna tifid, 
or twice-pinnatifid, smooth leaves emit a nauseous scent 
when crushed ; but from June to September it bears pale 
yellow flowers possessing a sweet almond-like fragrance, 
It would be interesting to know if this little plant is^ 
beautifying other unsightly refuse heaps in other parts of 
the country besides those we have in the city of Bristol. 
