CARNIVOROUS PLANTS OF CANADA. 



323 



that induces these tiny members of the animal 

 king-dom to press open the door, as it were, 

 force an entrance into this death trap, is as 

 yet an unsolved riddle. Mr. Kerner sug-g^ests 

 that it may be to escape being" drowned by 

 larger predaceous inhabitants of the pool. 

 Certainly none ever come back to warn their 

 fellows. 



We g"ive for those who may desire to ex- 

 amine these curious plants a brief account of 

 the few species indigenous to Canada : 

 flowers yellow, one petaled, two lipped. 



Ultricularia vulgaris, the g-reater bladder- 

 wort ; bears numerous bladders interspersed 

 among- the leaves, from 3 to 20 flowers, 

 found from the Atlantic to the Pacific. 



U. intermedia, Flatleaved bladderwort ; 

 the bladders with rare exceptions are borne 

 on leafless branches ; flowers i to 5, reported 

 from Newfoundland, New Zealand, Quebec, 

 in Ontario, from Ottawa west to London and 

 northward at Lake Huron, Lake Superior 

 and Lake Nipigon, also in Manitoba and the 

 Rocky Mountains. 



U. gibba. Humped bladderwort produces 

 few very small bladders scattered among 

 the leaves, and only one or two flowers ; 

 found at the eastern end of Partridge Lake, 

 Addington County, Ontario (Macoun), and 

 near Westminster, London, Ontario (Dear- 

 ness). 



U. clandesiina, Hidden fruited bladder- 

 wort ; this species, like our wild violets, has 

 two kinds of flowers, one kind like those of 

 the other species, in number 3 to 5 ; the 

 others very numerous and borne among the 

 bladders under water, strictly cleistogamous, 

 that is, fertilized in the bud, reported from 

 Kent and Albert Counties, N. B. 



U. minor, Lesser bladderwort ; the blad- 

 ders of this species are very small, about 

 one-twelfth of an inch in diameter and not 

 numerous, sometimes not any ; the flowers 

 from I to 10, flower stalk from 2 to 6 inches 

 high. In a marsh at Mount Stewart, Prince 



Edward Island, (Macoun) Labrador to 

 British Columbian (Britton). 



U. comuta. Horned bladderwort, grows 

 in the mud at the margin of small lakes and 

 ponds, flowers i to 6 ; very abundant along 

 Gulf River, between Big and Little Bushkong 

 Lakes ; at Chicken Bay, Lake Huron, Mc- 

 Intyre's Bay, Lake Nipigon (Macoun) ; re- 

 ported from Newfoundland, Nova Scotia, 

 New Brunswick and Quebec. The writer 

 has seen it in bloom on the borders of small 

 lakes near Gravenhurst in the month of July, 

 but could not find any bearing bladders. 



Pitcher Plants. The pitfall contrivance is 

 formed by the metamorphosis of the leaves 

 of the pitcher plants into sacs. There is 

 one member of this family common in Can- 

 ada, from the Maritime Provinces to the 

 Rocky Mountains, growing in mossy bogs 

 and marshes, Sarracenia purpurea. Pitcher 

 plant, Huntsman's Cup. See Fig. 1879, 

 showing the rosette of leaves and flowers 

 borne singly upon the upright stalk. 



As will be seen by the engraving, the 

 leaves, arranged in the form of a rosette 



Fig. 1879. 



