29 
PrantaGo lanceolata, Linn. May—Sept. 2. 6—12 in. Pastures 
and roadsides. 
PLatanus occidentalis, Linn. Button-wood. Sycamore. May. b. A 
very large tree. Banks of streams. Bark of the root cathartic. 
Poa annua, Linn. Ap.—Aug. %%. Grass 6—8 in. Fields. 
P. aquatica, var. Americana, Torrey. Aug. 2{. Grass 4—5 ft. 
Wet meadows. 
P. pratensis, Linn. Meadow-grass. May—July. 2. 2—3 ft. Mea- 
dows. 
P. trivialis? Linn. June—Aug. 2,. 2—3 ft. Meadows. 
P. compressa, Linn. Blue-grass. June, July. 2¢. 12—18 in. Fields 
and woods. 
P. serotina, Ehrhart. June. 2f, 2—3 ft. 
P. nervata, Willd. June. 2{. 3---4 ft. Wet meadows. 
P. Canadensis, Torrey. July, Aug. 2f. 3—4 ft. 
P. capillaris, Linn. Aug. 3. 1 ft. Sandy fields. 
P. pectinacea, Mich. July, Aug. %. 8—12in. Sandy fields. 
P. reptans, Mich. July, Aug. 3%. Low river banks. Creeping. 
6—8 in. Probably others undetermined. 
PopoPHyLium peltatum, Linn. May Apple. Wild Mandrake. w. 
May. 2. 12—18 in. Moist situations; banks of streams, shady 
woods, meadows, &c. Fruit large, ovate. Root a good cathartic. 
Poconta ophioglossoides, Brown. pale r. July. 2f, 8—12 in. Sphag- 
nous swamps. 
P. verticillata, Nutt. June, July. 2f. 1 ft. Moist shady woods one 
mile west of Troy. 
Potanisia graveolens, Raf. p. & y. July. 2. 8—12 in. Sandy pla-. 
ces and gravelly banks of the river. Nervine and anthelmintic. 
Properties depend on a volatile essential oil. 
Potyeata paucifolia, Willd. p. June. 2£. 3—4in. Woods. Flow- 
ers large. 
P. senega, Linn. Seneka Snake-root. whitish. June, July. 2. 1 ft. 
Woods. Root emetic, expectorant, diuretic, and diaphoretic. 
P. verticiliata, Linn. whitish. July—Oct. %. 6—8 in. Open woods 
and fields. 
Potyconum aviculare, Linn. Knot-grass. May—Sept. 2{. Procum- 
bent. Waste places, roadsides. Diuretic. ; 
P. erectum, Muhl. Aug. 2(. 1—2 ft. Roadsides and vicinity of 
cultivated grounds. 
P. tenue, Mich. w. July. %. 6—10 in. Rocky situations. 
P. lapathifoliwum? Linn. r-w, Aug. Sept. %. 2—8 ft. 
