AQUATIC PLANTS OF FRESHWATER 



species of which 14 occur generally in the United 

 States and 3 only in the Southern States. 



Utricularia vulgaris (Linn.) or Greater Blad- 

 derwort. Hooded Water-milfoil, Pop Weed, etc. 

 Fig 131, occurs in ponds and brooks throughout 

 nearly the whole of North America. The deli- 

 cate 2 to 3 pinnately divided and much crowded 

 floating leaves have numerous bladders, racemose 

 yellow flowers and long recurved fruit. Flowers 

 June to August and also propagates by winter 

 buds, 



Utricularia minor (Linn.) or Lesser Bladder- 

 wort, Fig. 131, occurs in bogs and shallow ponds 

 from Greenland, Labrador and British Columbia 

 south to New Jersey, Arkansas, Utah and Cali- 

 fornia. The floating leaves are 

 short, much scattered, with 

 fewer divisions and not as many 

 bladders borne among the 

 leaves. The flowers are pale 

 yellow and the fruit has the 

 peduncle reflexed. Flowers 

 June to September in different 

 altitudes. 



Utricularia biflora (Lam.) 

 or Two-flowered Bladderwort, 

 Fig. 132, occurs on the mar- 

 gins of ponds in New Jersey and New York, Massa- 

 chusetts and Rhode Island to Illinois, south to 

 Louisiana and Texas. The leaves are finely divided 

 with few divisions and are copiously provided with blad- 

 ders. The flowers are yellow. Blossoms during warm 

 weather, later in the season the farther north it occurs. 

 Other generally distributed species are U. gibba. 

 Humped Bladderwort; U. intermedia. Flat-leaved 

 Bladderwort; U. clandestina. Hidden-fruited Bladder- 

 wort; U. purpurea. Purple Bladderwort; and U. subulata. 

 Tiny or Zigzag Bladderwort. 



The Bladderworts are beautiful floating aquarium 

 plants which thrive satisfactorily indoors. Any of the fig. 132. Two-flowered 



1 j-ij ■ J -ti r \ Bladderwort, Utricularia 



three described species, and occasionally some of the bijiora. Reduced one-third. 



FIG. 131. Greater Bladderwort, 



Utricularia vulgaris; and Lesser 



Bladderwort, Utricula ia minor. 



Reduced one-third. 



205 



