30 
PoLyGonum punctatum, Elliott. Water Pepper. w. Aug. Sept. 2. 
1—2 ft. Inundated grounds. Very acrid. 
P. mite, Persoon. w. or pale r. July, Aug. #. 18 in. Wet places. 
P. Virginianum, Linn. w. July, Aug. 2f. 2—4 ft. Shady woods. 
P. persicaria, Linn. r. July, Aug. %. 1—14 ft. Low grounds. 
Acrid, diuretic. 
P. Pennsylvanicum, Linn. 7. July—Sept. 3%. 2—4 ft. Along 
ditches and low grounds. | 
P. amphibium, Linn. 7. Aug. Sept. 2f. Low and wet grounds. 
P. coccineum, Willd. 7. Aug. 2¢. Creeping along the muddy banks 
of an island in the Hudson, above Troy, from 6—12 fi. Float- 
ing in a pond near Schenectady. 
P. articulatum, Linn. r-w. Sept. %. 9—15 in. Sandy situations ; 
woods 3 or 4 miles west of Albany. 
P. sagittatum, Linn. w. July, Aug. 3. Prostrate. Wet grounds. 
P. arifolium, Linn. pale r. Aug. Sept. 3%. Prostrate or climbing. 
Wet grounds. 
P. Convolvulus, Linn. July—Sept. %. Climbing. 
P. scandens, Linn. w. or reddish. July, Aug. 3%. Climbing. Sha- 
dy places. 
P. fagopyrum, Linn. Buckwheat. r-w. July, Aug. 1—2 ft. Fields. 
Introduced. 
P. orientale, Linn. Prince’s Feather. r. July, Aug. 3%. 4—6 ft. 
Introduced. 
Potypropium vulgare, Linn. July. 2. Fern 6—10 in. Rocky 
woods and banks of ravines. Anthelmintic. 
P. hexagonopterum, Mich. July. 2;.. Fern 12 in. Shady woods. 
PonTEDERIA cordata, Linn. Pickerel-weed. b. July, Aug. 2f. 1— 
2 ft. Ponds. 
Poputus tremuloides, Mich. White Poplar. American Aspen. April. 
b. Tree 20—380 ft. Woods. Bark tonic. 
P. grandidentata, Mich. Ap. >. Tree 40—50 ft. Woods. 
P. Jevigata, Aiton. 
P. monilifera, Aiton. Ap. b. Tree 70—80 ft. River banks. 
P. dilatata, Aiton. Lombardy Poplar. Italian Poplar. Ap. 5. Cul- 
tivated. Bark tonic. 
Portutacca oleracea, Linn. Purslane. y. May—Aug. %. Stem 
and leaves succulent. In cultivated fields, door yards, &c. 
Poramoceton natans, Linn. Pond-weed. g. July, Aug. 24. Water. 
Upper leaves floating. 
P. fluitans, Linn. g. July, Aug. 2!. River. Upper leaves floating. 
