74 



Order 96.— AIISMACEJE. 116. 



1. Alisma, L. 



Plantago, L., var. Arnericanuin, Gr. (Water Plantain.} 

 Rivulets and marshy places. Frequent. July. 



2. Sagittaria, L. 



variabilis, Engelm. (Arrow-head.) 



Muddy shores, ditches, and wet meadows. Common, 

 July, 

 heterophylla, Pursh. 



Similar places; Cherry Island. Not common. July 

 heterophylla, var. elliptica, Gr. 



Ditches; Cherry Island. Not common. June, 

 simplex? Pursh. 



Ditches; Cherry Island, J. Jefferis'. Not common, 

 July, 

 pusilla, JYiift. 



Muddy shores of Shellpot Creek; Robinson's, &c. 

 Not common. 



Order 97.— HYDROCH ARID ACE^E. 117. 



1. Anacharis, Rich. (Udora, Nutt.) 



Canadensis, 1 Plane. OYater-weed.) 

 Slow streams, &c. Common. July. 



2. YALLiSNERrA, Micheli. 



spiralis, L. (Tape-grass. Eel-grass.) 



Slow streams; mill-races, &c. Common. Aug. 



Order 98— ORCHIDACEiE. 119. 



1. Orchis, L. 



spectabilis, L. (Priest in the Pulpit.) 

 Rich woods. Frequent. May. 



2. Gymnadenia, E. Br. (Habenaria, Hook.) 



tridentata, Lindl. 



Swamps and wet thickets; Thompson's, Lea's, &c. 

 Frequent. July. 



1 A singular form occurs in the Christiana Creek near Shakespeare': 

 Mills. 



