THE SWEET-FLAG FAMILY. 419 



HABITATS AND LOCALITIES. 

 1. Great Dtjckmeat — [Lemna polyrhiza.) 



Ponds and stagnant waters, rather uncommon. Ponds behind the 

 Art Treasures Exhibition site. Seaman's Moss Pits, abundant, and 

 in the canal not far off. Styal. Bowdon. Near Jackson's Boat. 

 Pond near Mill Bank, Poynton, abundant. (W. H. Heyes, Esq.) Fl. 

 summer, but very rarely. 



E. B. XXXV. 2458. 



2. IvT-LEAVED DucKMEAT — (^Lemnu trisulca.) 



Similar situations, not rare. Old Trafford ; Bowdon ; Chorlton ; 

 Withington ; Seaman's Moss Pits. Longford, in the same pits as the 

 Hydrocharis, exceedingly abundant. Fl. as L. polyrhiza. 

 Curtis, iii. 439 ; E. B. xiii. 926. 



3. Common Duckmeat — [Lemna minor.) 



Covers every stagnant pond with a close film of minute green 

 spangles. Fl. summer, but not commonly. 



Curtis, iii. 440 ; E. B. xvi. 1095 ; Baxter, vi. 424. 



4. Gibbous Ditckmeat — {Lemna gibha.) 



Similar situations, but rare. Chorlton. Seaman's Moss Pits, 

 sparingly, and abundant in pits at the edge of the canal alongside. 

 These pits are interesting as containing all four of the British Lemnas. 

 Fl. as L. polyrhiza. 



Curtis, iv. 583 ; E. B. xviii. 1233. 



All the Lemnas, except •polyrhiza, make excellent aquarium plants, keeping 

 the water clean, and tempering the light of the sun. 



CXLIII.-THE SWEET-FLAG FAMILY. Orontidcece. 



The Orontiaceae, like the Arum family, are remarkable in having 

 their flowers borne upon a " spadix." In general appearance also they 

 are very similar to the Araceaj, but their flowers are bisexual, without 

 any tendency to become unisexual, and in the principal portion there 



29 a 



