138 SOUTH DURHAM BALLAST HILI FLORA. 
Arenaria serpyllifolia, L.—This well known plant has been re- 
cently split up into three so called ‘‘ segregate species.” 
A. serpyllifolia (lL), A. leptoclados (Gussone), and A. 
Lloyd (Jordan). A. leptoclados is a plant with smaller 
capsules, smaller and thinner leaves, more slender stems 
and diffuse habit than the segregate serpyllifolia, and is 
the common form in this district. A. Lloydii on the 
other hand is of robuster growth, larger in all its parts, 
with ‘‘ viscid stems and calyces, the latter strongly and 
irregularly nerved.” It was first distinguished in our 
islands by Mr. A. G. More, who gathered it two years 
since on the coast sandhills at St. Helen’s in the Isle of 
Wight. This summer I found it at West Hartlepool. 
A. serpyllifolia, the intermediate form, is apparently scarce 
in South Durham, I have only noticed it in one locality 
near Sedgefield. 
Medicago sativa, L.—Common, Old and West Hartlepool. 
Medicago minima, Lam.—Two or three square yards of the 
West Hartlepool Ballast Hills were completely covered 
with a profuse growth of thousands of this little southern 
plant. Many of the specimens were as fine as any that 
I have gathered in Jersey. 
Melilotus vulgaris, Willd.—This species and the more common 
officinalis (Willd), are among the more abundant, and 
characteristic plants of the hills. 
Trifolium repens, L.—A viviparous form of the Dutch clover, 
in which the place of petals is supplied by little leaves, 
covers many square yards of ground at Seaham. 
Trifolium arvense, L.—Frequent in all the localities referred 
to in this paper. 
Trifolium scabrum, L.—Confined to one spot at West Hartle- 
pool, but there abundant. 
Onobrychis sativa, Lam.—Widely scattered over the Old Har- 
tlepool deposits. 
Scleranthus annuus, L.—The two Hartlepools. 
Petroselinum sativum, Hoffm.—West Hartlepool, not common. 
Oenanthe crocata, L.—Two or three plants, West Hartlepool. 
