BULLETIN OF THE UNITED STATES FISH COMMISSION. 261 



LABIATE. 

 Mint Family. 



64. Mentha rotundifolia, L. Round-leaved Mint. Maine, New Jersey, 



and Pennsylvania. 



65. Mentha viridis, L. Spearmint. Common (natural from Europe). 



66. Mentha piperita, L. Common (natural from Europe). 



67. Mentha aquatica, L. Water Mint. Delaware. 



68. Lycopus Yirginicus, L. Bugle-weed. Common, especially north- 



ward. 



69. Physotegia Virginiana, Benth. False Dragonhead. Western New 



York to Wisconsin and southward. Bocks, Potomac shore. 



GENTIANACEiE. 

 Gentian Family. 



70. Limnanthenmm lacunosum, Griesbach. From Maine and New York 



to Virginia and southward. 



71. Limnanthemum trachyspermum, Gray. Floating Heart. Maryland 



and southward. 



POLYGONACE^. 



Buckwheat Family. 



72. Polygonum arifolium, L. Halberd-leaved Tear-thumb. 



73. Polygonum hydropiperoides, Michx. Mild Water-pepper. 



74. Polygonum sagittatum, L. Arrow-leaved Tear-thumb. Common. 



PIPERACE^. 



75. Saururus, L. Lizard's-tail. Common. 



URTICACE^E. 



Nettle Family. 



76. Pileapumila, Gray. Richweed; Clearweed. 



77. Bcehmeria cylindriea, Willd. False Nettle. Common. 



ARACE^E. 

 Arum Family. 



78. Peltandra Virginica, Raf. Arrow Arum. Common. 



79. Calla palwtris, L. Water Arum. New England to Pennsylvania, 



Wisconsin, and common northward. 



80. Orontium aquaticum, L. Golden- Club. Massachusetts to Virginia, 



and southward. 



