i6 



427 Greenei Morong 



428 hyperboreum Laest. 



429 minimum Fries 



430 natans L,. 



431 simplex Huds. 



432 angustifolium (Michx.) 



Engelra. 



433 multipedunculatum Morong 



POTAMOGETONACEAE 

 Zostera 55 



434 latifolia Morong 



(Z. Padfica Wats.) 



435 marina L. 



436 minor (Carol.) Nolte 



437 Oregana Wats. 



Phyllospadix 56 



438 Scouleri Hook. 



439 Torreyi Wats. 



Potamogeton 58 



440 alpinus Balbis 



{P. rufescens Schrad.) 



441 amplifolius Tuckerman 



442 confervoides Reichb. 



{^P. Tuckermani Robbins) 



443 crispus L. 



444 Curtissii Morong 



445 diversifolius Raf. 

 {P. hybridus Michx.) 



446 multidenticulatus Morong 



447 trichophyllus Morong 



448 Faxoni Morong 



449 filiformis Pers. 



450 occidentalis (Robbins) 



Morong 



451 Macoimii Morong 



452 foliosus Raf. 



(jP. pauciflorus Pursli) 



453 Californicus Morong 



454 Niagarensis (Tuckerman) 



Morong 



455 Friesii Rupr. 



456 gemmiparus (Robbins) Morong 



457 heterophyllus Schreb. 



458 graminifolius (Fries) 



Morong 



459 minimus Morong 



460 myriophyllus (Robbins) 



Morong 



461 Hillii Morong 



462 lUinoensis Morong 



463 interruptus Kitaibel 



464 lateralis Morong 



465 latifolius (Robbins) Morong 



466 lonchites Tuckerman 

 (Z'. fluitans Roth) 



467 Noveboracensis Morong 



468 hicens L. 



469 Connecticutensis Robbins 



470 marinus L. 



471 mucronatus Schrad. 



472 Mysticus Morong 



473 natans L. 



474 Nuttallii C. & S. 



(/•. Pennsylvanicus Cham.) 



475 Cayugensis Wiegand. 



476 Oakesianus Robbins 



477 obtusifolius Mert. & Koch 



478 pectinatus L. 



479 perfoliatus L. 



480 Richardsonii A. Bennett 

 {P. perfoliatus var. lanceolatus) , 



481 praelongus Wulf. 



482 pulcher Tuckerman. 



483 pusillus L. 



484 Panormitanus (Biv.) 



Morong 



485 polyphyllus Morong 



486 Sturrockii A. Bennett 



487 Robbinsii Oakes 



488 rutilus Wolfg. 



489 spathulaeformis (Robbins) 



Morong 



490 Spirillus Tuckerman 



491 Vaseyi Robbins 



492 Zizii Roth , 



493 Methyensis (A. Bennett) 



Morong 



494 zosteraefolius Schum. 



Buppia 59 



495 curvicarpa Aven Nelson 



496 maritima L,. 



497 occidentalis Wats. 



498 pectinata Rydb. 



