SOUTH DURHAM BALLAST HILL FLORA. 137 
succeeded in detecting in the county that variety of P. 
dubium known as the segregate species, P. Lecoquit 
(Lamotte,) and which is distinguished by its stronger 
growth, more divided leaves, slightly different capsule, and 
yellow sap. 
Glaucium luteum, Scop—Old Hartlepool, scarce. 
Fumaria micrantha, Lag.—Rare; West Hartlepool. 
Corenopus didyma, Sm.—A single plant only observed at 
West Hartlepool. 
Coronopus Ruelli, Gaert.—Commen. 
Thlapst arvense, L.—West Hartlepool, scarce. 
Lepidium ruderale, .—Port Clarence, West Hartlepool, and 
Seaham. . 
Nasturtium. sylvestre, Br.—Common, West Hartlepool. 
Nasturtium terresire, Br.—Old and West Hartlepool. 
Nasturtium amphibium, Br.—A few plants on the more recent 
deposits at West Hartlepool. 
Sisymbrium Sophia, L.—Common and well established on the 
older part of the hills at Port Clarence and West 
Hartlepool. 
Sinapis muralis, Br. and S tenuifolia, Br. are among the most 
abundant plants of the Ballast Hills. 
Sinapis Schkuhriana, Reich.—I found a Sinapis growing on the 
oldest part of the West Hartlepool Ballast Hill, which 
I was unable to determine. Mr. J. G. Baker to whom 
I referred it, believes it to be the above named species. 
From its habitat, it has probably been established at 
Hartlepool for some years. 
Raphanus rhaphanistrum, L.—Frequent. 
Reseda fruticulosa, L.—Two or three plants at West Hartle- 
pool. £&. luteola and lutea are among the most abundant 
and characteristic plants ot the deposits. 
Saponaria officinalis, L.— Abundant and fine at the extremity 
of the Old Hartlepool Hills. 
Spergularia rubra, St. Hil—West Hartlepool, not common. 
The other species of the genus observed were S. marina 
(Lamb), and S. neglecta (Kind). 
VOL. V. PT. II. 5 12 
