P R U 177 



strobile? cvate ; terminal, scarcely longer uan the leaves. The bark 

 is used in tanning leather. 



1610. PISUM. 

 Exotic. 



Sati"vum, (pea. p. w. J. <v)) petioles terete ; .stipules round and cre- 

 nate at the base ; peduncles many flowered. Var. umbcllatum, (bo- 

 quet pea,) has the stipules 4-cleft acute. Var. quadratum, (quadrate 

 pea,) fruit ash colour, 4-sided. Var. humile, (dwarf pea,) stem erect, 

 not climbing; leafets roundish. 



32. POA. 



Pratcn"sis, (meadow grass. O. J. TJ.) panicle diffuse; upper leaves 

 much shorter than the smooth sheaths; florets acute, 5 nerved, 

 webbed at the base ; stipule short truncate ; root creeping. 2 3. f. 



121. PODOPHYLLUM. (From pous, a foot, tmdphutton, a leaf.) 



Pelta'tum, (wild mandrake, may-apple. O. w. M. 7J.) stem terminated 

 with 2 peltate palmate leaves ; flower single, inserted in the fork, 

 formed by the petioles of the leaves. Sometimes the plant is three 

 leaved, and sometimes the flower is inserted on the side of one of 

 the petioles. 1 2. f. 



IQ 6. POLYGALA. (From polus, much, and gala, milk.) 



Paucifo'lia, (flowering wintergreen. O. r. M. 9+) small, large flow- 

 ered ; stem simple, erect, naked below ; leaves ovate, acute, gla- 

 brous near the top of the stem ; flowers crested, terminal, about in 

 threes. 3 4. i. 



208. POPULUS. 

 Exotic. 



Dilata'ta, (loinbardy poplar, Italian poplar, Ap. Q) leaves glabrous 

 both sides, acuminatf. serrate, deltoid, the breadth equal to, or ex- 

 ceeding the length; branches erect, close to the stem. 



1113. POTENTILLA. (From potentia, power.) 

 Leaves digitate in fives, rarely in sevens. 



Canaden'sis, (common five finger. O. y. M. 1J.) procumbent, sub-ra- 

 mose, whitish silky ; stipules ovate, gashed ; leaves wedge obovate. 

 gash toothed ; stem ascending, and creeping hirsute ; peduncles so- 

 litary, elongated; divisions of the calyx lance-linear, petals orbicu- 

 lar, sub-entire, of the length of the calyx. 



131. PRUNELLA. 



Vulga'ris, var. pennsylvanica, (heal-all, self-heal. O. J. r 2|) leaves peti- 

 oled, oblong-ovate, toothed at the base; lips of the calyx unequal; 

 upper one truncate, awned ; stem ascending. 6 12. i. 



