OF DENISON UNIVERSITY. 89 



but has not been collected recently. It is possible that it is extinct. 

 No herbarium specimen. 



XCVI. LEMNACEAE. 



377. Spirodela Schleiden. 



776. S. polyrrhiza Schleid. 

 Swamps, ponds, etc., common. 



378. Lemna L. 



777. L. trisulca L. 



Licking Reservoir. Reported by W. C. Werner. 



778. L. minor L. 



Licking Reservoir and grounds, common. 



379. Wolffia Horkel. 



779. W. Columbiana Karsten. 



In the pool just south of the Lakeside Hotel at the Licking Res- 

 ervoir. This is in Fairfield county, just over the line. 



XCVII. ALISMACEAE. 



380. Alisma L. 



780. A. Plantago L. 



Wet places, common. August 15, 1888; July 4, 1890. 



381. Sagittaria L. 



781. S. variabilis Engelm. 



Licking Reservoir, very common. The following varieties are to 

 be found in the Reservoir and Licking River. 



782. Var. obtusa Gray. 



783. Var. latifolia Gray. 



784. Var. angustifolia Gray. 



785. Var. gracilis Engelm. Licking River at Toboso. 



786. S. heterophylla Pursh. 



Wet places, rather common. July 9, 1889; August 10, 1891. 



787. S. heterophylla Pursh. Var. rigida Engelm. 

 Shallow water in the canal at Newark. September 1, 1801. 



788. S. heterophylla Pursh. Yar. angustifolia, Engelm. 

 Reservoir, rare. July 9. LSS9. 



