196 FLORA OF THE EAST RIDING OF YORKSHIRE. 



1605. Potamog-eton pectinatus. Lmn., 83. 



(Fennel-leaved Pondweed). 

 Native, Brit., 1, 2, 6, 7. July, I. 



Common, particularly in Holderness; at Marfleet; Stone- 

 ferry in small ponds and dykes. In Teesdale's list as 

 P. mariiiHS. 



1606. P. interruptus. Kit, 48 ? 



Native, Eng., 2, 6. July, I. 



Frequent. Market Weighton Canal {C.W., fide Mr. Ar. 

 Bennett); drain near Marfleet; Holderness (C.W.). 



1609. Ruppia rostellata. Kodi, 40. 



Native, Brit., 2. Aug., III. 



Uncommon. Tidal pools, Easington, 1900, and Patrington 

 Haven, 1901 ; both first records of Mr. T. Petch. 



1 6 10. Zannichellia palustris. Linn., 71. 



(Horned Pondweed). 

 Native, Brit., 1-7. Summer. 



Very common in stagnant and sluggish watery places. 



161 4. Zostera marina. Linn., 55. 



(Grass Wrack). 

 Native, Brit., 2. Aug., II. 



Cast up within Spurn Head, 1888.* 



CYPERACE^. 



1622. Eleocharis acicularis. R. Br., 72- 



(Little Spike-rush). 



Native, Eng., 2, 6, 7. June, II. 



Not common. Near Pocklington and Dunnington Com- 

 mon, near York (B.); Hall Ings, Cottingham (C.W., June, 



