106 



NAIADACE^E. 



ARUM. (Arum, Cuckoo-pint.) 



A. maculatum. L. (Cuckoo-pint, Wake Robin, 



Lords and Ladies.) 

 Groves and hedges. 4, 5. 

 Very common in all the hedges. 



ORDER CIV. PISTIACE^:. (DUCKWEED TRIBE.) 



LEMNA. (Duckweed.) 



1. L. trisulca. L. (Ivy-leaved Duckweed.). 

 Clear stagnant waters. 7, 8. 



Grove Pond, Harrow; Harrow Park Lake. Pond in 

 Payne's Lane, Pinner. 



2. L. minor. L. (Lesser Duckweed.) 

 Stagnant waters. 7, 8. 

 Everywhere abundant. 



3. L. polyrrhiza. L. (Greater Duckweed.) 

 Stagnant waters. It never flowers in Britain. 



Pond at Harrow. Brook in Moll Cobb's Lane, Pinner. 



4. L. gibba. L. (Gibbous Duckweed.) 

 Stagnant waters. 6-9. 



Ponds at Roxeth. With the last in Moll Cobb's Lane, 

 Pinner. Greenford Road. (Farrar.) Harrow Weald. 

 (Flor. Midd.) 



ORDER CV. NAIADACE^E. (PONDWEED TRIBE.) 



POTAMOGETON. (Pondweed.) 



i. P. densus. L. (Opposite-leaved Pondweed.) 

 Ditches and rivers. 6, 7. 



