112 Annals ok the Carnkgie Musf.u.m. 



* A. Dracontium (Linmxius). Green dragon. 



Stenvtt Township, low woods near (". C. Mellor's j)lace, July, 

 1886. 



CALLA Linn;i:;us. 

 § C. palustris Linnfeus. Water arum. 



SPATHYEMA Kafinesque. 

 S YMPL O CA RF US Sal i sbu r y . 



* S. foetida (Linna.His). Skunk cal)bage. 



ACORUS Linn;^nis. 



* A. Calamus Linnaeus. Calamus-root. 



LEMNACE^ Dumortier. 

 DUCKWEED FAMILY. III-to. 

 LEMNA Linn?eus. 

 t L. minor Linnaeus. Lesser duckweed. 



f L. trisulca Linnaeus. Star duckweed. 



VALLISNERIACE^ Dumortier. 



TAPE-GRASS FAMILY. III-6. 



VALLISNERIA Linnaeus. 



* V. spiralis Linnaeus. Tape -grass. 



O'Hara Township, Allegheny River above Aspinwall, September 

 20, 1899. 



ALISMACE^ De Candolle. 



WATER-PLANTAIN FAMILY. III-5. 



ALISMA Linnaeus. 



* A. Plantago-aquatica Linnaeus. Water-plantain. 



