POTAMOGETONACEiE. 295 



I. Harefield ! ; BlacJcst. Fasc. 89. 

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

 Thames bet. Hampton and Kingston. 



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



dant. Cran at Hospital Bridge and Twickenham. 



IV. Hampstead ; Irv. MSS. North End ; M. ^" G. 205. 



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

 Herb. Devon Institution, Exeter. 

 VII. New River Head, plentifully ; Pet. Midd. Pond by Copenhagen 

 House; M. cf G. 205. Paddington Canal, 1818; Bennett {v. s.). 

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

 {y.s.\ Thames, near Putney, 1817; Herb. G. ^ B. Bishop's 

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

 pentine. 



First record: Petivcr, 1695. 



714. P. crispus, L. 



Tribulus aquat. oninor quercusjt., 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, Roxeth ; Melv. 83. Hounslow ; Herb. Ktw. 



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



more. Cricklewood ! ; Warren. 

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

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

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

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

 rose Hill. 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. S{ 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. obtusifolius, Koch. P. gramineus, var. (L. Cat.). 

 ? P. gramineum f (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. zosterifolius, or P. acuti/oUus 

 not then differentiated. 



