ol 
PoTAMOGETON heterophyllum, Schreber. g. July, Aug. 24. River. 
Upper leaves floating. 
P. diversifolium, Barton. g. July. 2{. River. Upper leaves floating. 
P. perfoliatum, Linn. g. July, Aug. 2¢. Hudson river. 
P. lucens, Linn. g. July, Aug. 2. River. 
P. crispum, Linn. r-g. July. 2(.. Mohawk river. 
P. pectinatum, Linn. g. July. 2. River. 
P. gramineum, Mich. g. July, Aug. 2f. River. 
P. compressum, Linn. g. July, Aug. 2f. Water. 
PorenTitLA WNorvegica, Linn. Norway Cinquefoil. y. June—Aug. 
x. 8—18in. Fields. 
P. Canadensis, Linn. Five-finger. y. May. 2f. Procumbent. 2— 
18 in. Fields and woods. Root tonic and astringent. 
P. argentea, Linn. y. June—Sept. 2(. Ascending. 4—10 in. Fields 
and roadsides. 
P. anserina, Linn. y. June—Oct. 2f. Prostrate, creeping. Shores 
of the Hudson. Somewhat astringent. 
P. Comarum, De Cand. Marsh Cinquefoil. p. June. 2f. 12—18 in. 
Sphagnous swamps. Flowers large. Root astringent. Coma- 
RUM palustre, Linn. 
P. arguta, Pursh. pale y. June. 2. Rocky and stony hills. Boortra 
sylvestris, Bigelow. 
PRENANTHES alba, Linn. y-w. Aug. 2(. 2—4 ft. Woods. Deob- 
struent and somewhat narcotic. 
P. altissima, Linn. yellowish. Aug. 2f. 4—6 ft. Woods. 
P. cordata, Willd. yellowish. Aug. 2{. 
Prinos verticillatus, Linn. Winter Berry. w. June. b. 6—8 ft. 
Swamps. Berries bright scarlet; adhering in the winter. Bark 
tonic. 
P. ambiguus, Mich.? w. 6. Shrub. Wet. 
ProserPInaca palustris, Linn. Mermaid-weed. July, Aug. 2. 
Swamp 3 miles west of Albany. 
PRuNELLA vulgaris, Linn. Heal-all. p. June—Aug. 2{. 6—12 in. 
Fields, meadows, &c. 
Prunus Virginiana, Linn. Wild Cherry. w. May. &. Large tree. 
Fruit purplish black. Bark tonic and narcotic. 
. serotina, Willd. w. June. 5. Berries astringent. 
. Pennsylvanica, Aiton. w. May. 6. 8—15 ft. 
. Americana, Marshall. w. May. >. 
. pumila? Linn. w. May. >. Low shrub. 
. pygmaa? Willd. w. &. Shrub. 2—3 ft. Fruit black, size of a 
large pea. Green Island. 
nf ag ag 
