i3§ 
P. lucens (L ). Fig. 657. Great Pondweed. Native. P. VI. 
Ponds and ditches. Very rare. 
L. Formby Marsh (D.). 
C. 1895, Pond near Ledsham (Dr. g.). 
P. perfoliatus (L.). Fig. 658. Perfoliate Pondweed. Native. 
P. VII. 
Canals and ponds. Very rare. 
L. Canal between Bootle and Litherland (H.). And on to 
Halsall, &c. (r.b.). 
P. crispus (A.). Fig. 659. Curled Pondweed. Native. P. VI. 
Ponds and ditches. Frequent. 
C. Birkenhead Park ; Bidston Ford ; Leasowe. 
b. s err at us (Finds.). 
Is often met with in the district. 
P. densus (L.). Opposite-leaved Pondweed. Native. P. VI, VII. 
Ponds and ditches. Very rare. 
L. Ponds in brickfields between Edge Lane and Wavertree 
Road ; on E. side of the Botanic Gardens (f.m.w.). 
Note. — This locality was probably destroyed by the building of the 
Exhibition in 1886. 
P. obtusifolius ( Mert . and Koch.). Fig. 660. Grassy Pondweed. 
Native. P. VI, VII. 
Ponds and ditches. Occasional. 
L. Stream in Croxteth Park ; Crosby Marsh ; near High- 
town Station (D.). Pond in quarry N.W. of R. C. Chapel, 
Little Crosby (j.h.l.). 
C. Near Rock Ferry (D.). In ponds in the following 
localities, viz. : halfway between Hadlow Road Station and 
Hailwood Farm; W. end of Capenhurst ; near Hargreave 
Hall ; by the footpath from L. Sutton Station towards Over- 
pool ; near Rake Lane, Bromborough ; in Hooton Park ; 
between Ledsham Station and Hadlow Road ; and thence 
westward towards the Chester Road (r.b.). Ponds near Raby 
and Backford (Dr. g.). 
P. pusillus (L.). Small Pondweed. Native. P. VI. 
Ponds and ditches. Frequent. 
C. Near Willaston ; Helsby Marsh. 
b. tenuissimus (Koch.). Fig . 661. 
C. Langfields, West Kirby ; Newton ; Backford ; S. U. 
Canal (Dr. g.). 
