33 



I occidental L. Sycamore. Button Wood. 



296 Poa L. 



1 annua? L. 



2 aquatica W. jj americana Torrey. 



3 canadensis Torrey. Briza canadensis Mx. 



4 capillaris L. 



5 compressa L. Blue Grass. 



6 dentata Torrey. 



7 elongata Torrey. Torreyana Sprengel. 



8 eragrostis ? L. 



9 nemoralis L. 

 10 hirsuta Mx. 



I I maritima Muhl. Salt Marshes, Cambridge. 



12 nervata W. Briza canadensis JVutt. non Mx. 



13 palustris Muhl. 



14 pectinacea Mx. Springfield. 



15 pratensis L. English Grass. 



16 reptans Mx. Whitmore's Ferry, Sunderland. 



17 trivialis L. 



297 Podophyllum L. 



1 peltatum L. May Apple. Amherst, S. Parish. 



298 Podostemum Mx. 



1 ceratophyllum Mx. Thread Foot. Ct. River. 



299 Pogonia Brown. Arethusa L. 



1 ophioglossoides L. Snake Mouth Arethusa, 



2 verticillata L. Deerfield. 



30(TPolygala L. 



1 paucifoliaW. Flowering Wintergreen. 



2 sanguinea L. 



3 vetticillata L. Dwarf Snake Root. 



301 Polygonum L. 



1 amphibium L. Sudbury. 



2 arifolium L. Halbert Knotweed., 



3 articulatum L. Joint Weed. 



4 aviculare L. Knot Grass. 



5 cilinode Mx. 



6 convolvulus L. Bind Knot Weed. 



7 mite Pers. Tasteless Knotweed. 



