15. C. rigida, Good. Native. Highland type. Area C, D. Range 2, 3.
Plentiful about the peak of Cheviot. In Teesdale on a moor near the Caldron Snout (Sir W. C. Trevelyan. F!). Range 550-850 yards.
16. C. vulgaris, Fries. Native. British type. Area C, N, D. Range 1-3.
Everywhere common in inundated places, ascending to 750 yards on Highfield.
17. C. stricta, Good. Native. English type. Area N, D. Range 1.
Reported in the Flora from Heaton Dene and a marsh near St. Anthony's ballast hills, but we have never seen Northumbrian specimens, and the station of Westcrow Wood near Wolsingham is no doubt a mistake. In Durham we have seen the true plant in plenty at Hell Kettles near Croft, and received it from the Rev. A. M. Norman from Red Carr near Sedgefield.
18. C. acuta, L. Native. British type. Area C, N, D. Range 1.
Frequent by stream-sides and in swamps in the low country.
19. C. flava, L. Native. British type. Area C, N, D. Range 1, 2.
Frequent in inundated places, ascending to 550 yards on Cheviot, 600 yards on Highfield and Kilhope Law.
20. C. extensa, Good. Native. Maritime. British type. Area C, D. Range 1.
Salt marshes, not unfrequent. On the beach north of the village on Holy Island (Thompson), Warren Mills near Budle (Professor Oliver and W. H. Brown!), Howick and Alnmouth (T.). In Durham about the mouth of the Wear, and at Hartlepool and Seaton Carew.
