'^LIBRARY 



ARACEiE. Arum Family. 



ARIS.E.MA. Martins. Indian Turnip. 



24115. A. TRIPHYLLUM, Torr. (Jack in tlic Pulpit.) 

 Rich low woods. Common May 3. (D.) 

 CALLA, L. Water Arum. 



2408. C. PALUSTIUS, L. 



Swamps and margins of ponds and rivers. Common. May 3. (B ) 

 ACORUS, L. Calamus. 



2411. A. CALAMUS, L. (Sweet Flag.) 

 Marshes and river margins. Abundant. June 2 (R.) 



LEMNACEiE Duckweed Family. 

 LEMNA, L Duckweed. 



2412. L. trisulca, L. 

 Submersed in water. Very common. A very pretty plant for an 



a<[iiarium. Several fronds usually grow attached together by 

 slender stalks, in apparently trifoliate leaves. Inflorescence 

 very rare here. Rootlets green, twisted. 



2413. L. MINOR, L. (Lesser Duckweed.) 

 Floating on all stagnant water. Fronds almost round, rather thick, 



producing a single rootlet beneath. Young fronds produced from 

 a cleft in the side of the frond. This curious plant may usually 

 be found in flower if carefully looked for in warm undisturbed 

 nooks in the latter half of June The inconspicuous flowers are 

 pushed out from a cleft in the side of the frond and then turn 

 upwards, when they may be detected by the colour of the anthers. 

 SPIRODELA. 



2414. S. POLTRRHIZA, L (Large Duckweed ) 

 Lemna polyrrhiza, L. 

 Floating on all still waters. Easily distinguished from the above by 



the large fronds which are dark green above, purple beneath and 

 bear several rootlets. I have never found this in flower. 

 WOLFFIA, Horkel. 



2415. W. Columbiana, Karsten. 

 Abundant in the St. Louis Dam, growing with Lemna minor and 



floating just beneath the surface film of the water. Fronds pale 



