p R o isr 



44. POTAMOGETON, 15. 6. 

 natans (pond weed, g J. U .) leaves long-petioled, float- 

 ing, lance-oval ; at first some of them are subcordate. 

 fluitans. setaceum. perfoliatum. lucens. crispum. pee- 

 tinatum. gramineum (grass pond weed.) compressum. 

 1213. POTENTILLA, 35. 92. 



1. Leaves ternate. 



norwegica (cinquefoil.) tridentatu (mountain cinque- 

 foil.) hirsuta. 



2. Leaves digitate in Jhes 9 rarely in sevens* 



canadensis (common fivefinger. y. M. % .) procumbent, 

 subramose, whitish-silky : stipules ovate, gashed, pu- 

 inila (dwarf fivefinger.) simplex, argentea (silver five- 

 finger.) recta. 



3. Leaves more or less pinnate. 



fruticosa (shrubby cinquefoil.) Jloribunda. anserind 

 (tansy cinquefoil.) pensylvanica. supina> 



2013. POTERIUM, 54. 92; 

 sanguisorba (burnet. E. J. if.) stem somewhat angled, 

 unarmed, leaved pinnate. 



41. POTHOS, 2. 7. 



foelida (skunk cabbage, p. ap. i.) stemless : leaves ra- 

 dical, heart ovate, very large. 



181. PRENANTHES, 49. 53. 

 alba (white lettuce, wtp. Au. i.) radical leaves angled- 

 Ivastate, toothed, somewhat lobed. altissima. ~ cordata. 

 virgata. rubicunda. 



51. PRIMULA, 2U 34. 



acaulis (primrose.) Ten's (cowslip primrose.) elatior 

 (oxlip primrose.) auricula (auricula tulip.) farinosa 

 (birds' eye primrose, mistasinica. 



61. PRIM OS, 43. 95. 



verticillatus (winter berry, false alder, w. J* ^ .) leavevS 

 oval, serrate, acuminate, pubescent beneath, glaber (ink 

 berry.) laevigattis. ambiguus. 



33. PROSERPINACA, 15. 22. 



palustris (mermaid weed. g. Ju. .) leaves linear-lan- 

 ceolate, serrate above water $ pinnatifid (below, pecti- 

 nata* 



