126- P Y K 



141. PRUNELLA, 42, 39. 



pensyl-canica (heal -all, self-heal. J. y.) leaves petioledy 

 oblong-ovate, toothed at the base. 



121. PRUNUS, 36. 92. 



Girginiana (wild cherry, rum cherry, cabinet cherry.) 

 serotina (choke cherry w. J. 12 ) flowers in lax racemes : 

 leaves simply serrate, canadensis. pensiilvanica. bo- 

 realis. nigra. pygmaea (american sloe.) Jiiemalis (win- 

 ter plum.) chicasa (summer plum, chicasaw plum.) 

 sphaerocarpon. tnaritima. .pumila. deprcssa- spinosa 

 (english sloe.) susquehanna. cerasifera. cerasus (gar- 

 den cherry.) padus (bird cherry.) avium (small bird 

 cherry.) domestica (plum.) E. w. M. k peduncles sub- 

 solitary : leaves lance-ovate, convolute : branches thorn- 

 less. Var. Juliana (damson plum) fruit oblong, blue. 

 Var. claudiana (sweet plum, horse plum) round, at first 

 green, becoming yellowish. Var. enudeata (stoneless 

 plum) the putamen obsolete. 



21. PSILOTUM, 55, 5, 

 dkhotomum (naked ground pine. 



221. PTERIS, 55. 5. 



aquilina (common brake. Ju. If.^) frond phinate-3-part- 

 ed- atropurvure a (rock brake.) gracilis. caudata. 



101. PTEROSPORA. 

 andromeda (Albany beach-drops^ A. y-w. Au.) 



51. PULMONARIA, 41. 42. 

 qfficinalis (lung-wort.) parviflora. "virginica. sibirica* 



121. PUNICA, 36. 92. 

 granatum (pomegranite.) 



141. PYCNANTHEMUM, 42. 39. 



incanum (wild basil, mountain mint. w. r. Ju. Z.) leaves 

 oblong-ovate, acute, subserrate, white downy, arista- 

 cum. 



182. PYRETHRUM, 49. 55. 

 serotinum. 



101. PYROLA, 18. 51. 

 Toinndifolia (shin-leaf;- pear-leaf wintergrcen, w. J. U J 



