POTAMOGETONACE^. 295 



I. Harefield ! ; Blackst. Fasc. 89. 



II. Grand Junction Canal, W. Drayton! ; Newb. Queen's Eiver, Hampton. 

 Thames bet. Hampton and Kingston. 



III. Thames at Twickenham, abundant. Colno, Staines Moor, &c., abun- 



dant. Cran at Hospital Bridge and Twickenham. 



IV. Hampstead ; Irv. MS8. North End ; M. ^ G. 205. 



V. Canal at Greenford and Apperton ! ; Melv. 83. Brent, near Ealing ; 

 Herb. Devon Institution, Exeter. 

 yil. New Eiver Head, plentifully; Pet. Midd. Pond by Copenhagen 

 House; M. # G. 205. Paddington Canal, 1818; Bennett (v. s.). 

 Ibid., 1869; Warren. Lea and Hackney Canals, abundant ; Cherry 

 (v.s.). Thames, near Putney, 1817; Herb. G. # B. Bishop's 

 Walk, Fulham ; Herb. Hardw. Ornamental basins at head of Ser- 

 pentine. 



First record : Petiver, 1695. 



71ft. P. crlspus, L. 



Tribulus aquat. minor quercusji., Ger. em.* (Johns., Blackst.). 



Cyb. Br. iii. 15. Syme E. B. ix. t. 1413. 



Ponds and streams ; rather rare ?. P. June — August. 



I. Harefield ; Blackst. Fasc, 100. Wax-well, Pinner. Pond by Church, 

 South Mims. 



III, Grove pond, Eoxeth ; Melv. 83. Hounslow ; Herb. Kew. 



IV. Hampstead ; Irv. M8S. Lake in Harrow Park ; Melv. 83. Stan- 



more. Cricklewood ! ; Warren. 

 V. Canal, Greenford ; Melv. 83. Near Willesden Junction ! ; Warren. 

 VII. New Eiver, M. ^ G. 207. Marylebone Park ; Herb. Budge. Isle 

 of Dogs, E. F.; Herb. Miis. Brit. About London ; Johns. Ger. 823. 

 Paddington Canal ; Warren. Hackney Canal. Pond beyond Prim- 

 rose HiU. Ornamental basins, head of Serpentine. 

 First record: Johnson, 1633. P. serratus, Huds., is a state with the 

 leaves not crisped (the young leaves are usually so) ; it is figured in 

 flower in Pet. H B. Cat. v. fig. 8. About West End, near Hampstead ; 

 M. ^ G. 208. Canal, Greenford ; Herb. Harr. 



715. P. zosterifolius, Schum. P. gramineus, var. (L. Cat.). 

 Cyb. Br. ii. 14. Syme E. B. ix. t. 1415. 



Streams ; very rare. P. June. 



V. In the Brent Canal by Brentford, A. Irvine ; Herb. Syme. 



The only record. Was this merely floating in the water, or growing rooted 

 in the soil ? 



716. P. obtusifollus, Koch. P. gramineus, var. (L. Cat.), 

 ?P. gramineumf (M. & G.). 



Cyb. Br. iii. 12. Syme E. B. ix. t. 1417, 



» The figure in Ger. em. is P. crispus, but the description is that of P. densus. 

 t By this name may have been intended either this or P. zoiteri/oUui, or P. acuti/olius 

 not then differentiated. 



