202 POTAMOGETON. ZOSTERA. 



47. P. OBLONGUM* = P. iiatans, var. 2. With. Bot. Arrang. ii. 

 212. In ditches, shallow ponds, and drains on all our moors. June- 

 Aug. 



48. P. PLANTAGiNEXJM. Eng. Bot. Supp. pi. 2848. Babington 

 in Berw. Club Trans, i. 178; Prim. Fl. Sarn. 99. —B. Ferney-rig 

 marsh in the parish of Eccles, Dr. R. D. Thomson, who had distin- 

 guished the plant as a species, and communicated specimens to me, 

 long previous to its publication as a native of England. 



49. P. HETEROPHYLLUM. B. Abundant in Coldingham lough. 



.50. P. LUCENS. In the Tweed, especially abundant in the still 

 water above the Union chain bridge, and it flowers at a season when 

 a visit to that beautiful work is made with most pleasure. " In the 

 summer season," says the Rev. J. Edgar, " it is much visited by 

 strangers and generally admired. The most commanding view of it 

 is obtained from the English side, about half way up the hill on the 

 road which leads from the bridge to the village of Horncliffe. There, 

 on a summer evening, the still and pellucid waters of the silver 

 Tweed, which assume here the quietude and smoothness of a lake ; 

 the light and fragile form of the bridge floating in the air, with its 

 shadow reflected from the stream beneath ; the tasteful clumps of 

 planting which adorn the banks ; the trees and woods of Paxton and 

 Tweedhill, in all the pride of vegetative luxuriance ; and the fisher- 

 men in their boats plying at their vocation on the unrufiled waters, — 

 present a scene highlv beautiful and imposing." Stat. Ace. Berwicks. 

 p. 162. 



51. P. RUFESCENS. B. In the Eden, and in ditches leading into 

 it. — N. Swinhoe lough south of Kyloe. Aug. 



52. P. PERFOLiATUM. Commou in the Tweed and Whiteadder, 

 and in large ponds. July. 



53. P. CRisPUM. Ponds and still waters, common. 



54. P. pusiLLTJM. In the Tweed, Whiteadder, and Eden, in 

 various places. 



55. P. GRAMiNEUM. R. Yctholm lough, R. C. Embleton; and 

 in pools at the W. end of Hoselaw loch. Rev. J. Baird. 



56. P. PECTiNATUM. Abundant in the lower parts of the White- 

 adder, and in the Tweed. D. Holy Island lough. July. 



57. P. FiLiFORME. B. In Coldingham loch. July. 



58. Zannichellia palustris. In ponds, not uncommon. Aug. 



59. ZosTERA MARINA. Covcrs the sandy flats between Goswick, 

 Fenham, and Holy Island. Sir Walter Calvery Trevelyan gave me 

 some specimens gathered on the shore of the island which he di- 

 stinguished from the true Z. marina by their much smaller size. 



* Potamogeton is made masculine by most, and neuter bj' others. We 

 follow Smith in doing so ; but it appears that the word is proi)erly feminine. 

 See Dr. Adams in Murray's North. Flora, p. iii. of the Appendix. 



