INDEX. 



809 



Potauiogeton h y b r i d u s 



PENTAGN 35 



Potamogeton illinoensis MORONG 36 



Potamogeton interruptus KIT. 37 



Potamogeton lanceolatus SM 38 



Potamogeton loeselii R. and S. 35 



lonchites TUCKM 34 



Potamogeton lucens LINN 37 



Potamogeton lucens var. minor 



UFH 36 



lucens WEBB 38 



lucidus GULDENST 37 



major MORONG 37 



mucronatus NYM 36 



Potamogeton natans LINN 34 



Potamogeton natans var. 



angustatus MK 34 



natans var. flu i tans 



CHAM 34 



oederi MEY 37 



oblongus MEY 34 



palustris TEESD 35 



pauciflorus PURSH 39 



paucifolius OP 35 



Potamogeton pectinatus LINN ... 37 



perfoliatus LINN 35 



perfoliatus var. lanceo- 



latusRoBBiNS 38 



perfoliatus var. richard- 



soni BENNETT. 38 



petiolarisPR 34' 



Potamogeton praelongus WULF . 38 

 Potamogeton proteus var. het- 

 erophyllos CHAM, and 



SCHLECHT *35 



proteus f. lucens CHAM. 



and SCHLECHT 38 



proteus f . zizii CHAM, and 



SCHLECHT 36 



purshianusMoRONG 39 



Potamogeton pusillus LINN 36 



Potamogeton pusillus var. 



major FRIES 37 



Potamogeton rutilus WOLFG .... 37 



Potamogeton serratus WEBB. . 37 



vaillantii R. and S 37 



verticillatum WALT 384 



volhynicus BESS 38 



zizii ROTH 36 



Potamogeton zoster aefolius 



SCHUM 39 



Potamogeton zosterophyllus 



Dum 39 



Potamog-etonaceae 33 



Potaninia MAX 293 



Potentilla LINN 293 



anserina LINN 294 



argentea LINN 296 



arguta PURSH 298 



Potentilla bipinnatiflda 



DOUGL 297 



Potentilla canadensi* LINN . 294 



canadensis var. simplex 



(Micnx.).. 294 



Potentilla caroliniana POIR. . . 294 



conferti flora TORR 298 



floribunda PURSH 295 



Potentilla fruticosa LINN 295 



Potentilla fruticosa var. ameri- 



cana MARSH 295 



Potentilla hippiana LEHM 297 



Potentilla lacradorica LEHM.. 298 



leucophylla TORR 297 



PotenHUamillegrana ENGELM.. 298 



norvegica LINN. 289 



palustris ( LINN. ) 296 



Potentilla paradoxa NUTT 297 



Potentilla pensylvanica LINN.. 297 

 Potentilla pensylvanica var. 



arguta TORR 299 



pensylvanica var. bipin- 

 natiflda T. and G 297 



pensylvanica var. hip- 

 piana T. and G 297 



Potentilla pensylvanica var. 



strigosa PURSH 297 



Potentilla pumila POIR 294 



retusa MULL 295 



rivalis- var. millegrana 



WATS 298 



sarmentosa WILLD 294 



si mplex MICHX 294 



Potentilla supina LINN 297 



tridentota SOL 295 



Pothos foetidus MICHX 131 



Prasium concinneum WALT. . 446 



purpureum WALT 446 



Praxelis CASS 501 



Prenanthes LINN 565 



alba LINN 566 



-aspera MICHX 566 



crepidinea MICHX 567 



Prenanthes illinoeusis PERS. . . 566 



juncea PURSH 565 



miamensis RIDD 566 



ovata RIDD 566 



proteophylla RIDD 566 



Prenanthes racemosa, MICHX. . . 566 



Prenanthes rubricunda WILLD 566 



Prenanthes serpentaria PURSH. 566 



Prenantbes suavis SALISB 566 



Prestinaria SCH.-BIP 543 



Prieuria DC 375 



Primula O. KUNTZE 411 



, occidentalis OKi 411 



Primulaceae 411 



Primulopsis T. and G 381 



Prinos LINN 349 



gronovii MICHX^ 350 



confertus MOENCH 350 



verticillatus LINN 350 



Prionopsis NUTT 514 



Prismatocarpus L'HER 496 



Proteopsis Scn.-BiP 499 



Provenzalia ADANS 131 



Prunella LINN 446 



Prunophora NECK 305 



Prunopsis ANDR 305 



