178 



J. O. HAGSTROM, CR1TICAL RESEARCHES ON THE TOTAMOGETONS. 



f. (or var.) htncijolius Cir. & Schl. Both occur in rivulets. The same is the case 

 with v. pseudo-fluitans Sy me. — F. rotundifolius Fischer is probably the same as 

 ericetorum Syme. — If the f. cancellatus Fbyeb is not a hybrid, it might be consi- 

 dered a form of v. lancifolius. Its short-petioled submersed leaves (Fryer, Pot. 

 Brit. Isles, 1898, 21, t. 12) make it a more dubious form. 



Distribution: P. polygonif olius occurs in many places of the Scandinnvian 

 peninsida up to a line drawn from South Helsingland, Stråkärra, the most northern 

 station in Sweden (coll. Zetterstedt, hb. Uppsal, et Lund.), through south Dalarne 



(Grangärde) to the middle of V ermland 

 (Råda, coll. Hagström, hb. Stockholm), 

 and from thence westward through 

 Norway, where it follows the western 

 coast to South Nordland (Melö, 66° 50' 

 according to Blytt, Norges Fl. I, 1902, 

 46). Eastward it has spread to Alan- 

 dia (Geta, Svartträsk, 01, Palmgren 

 & Klingstedt, hb. Stockholm.), but 

 is wanting in Oland and in Gothland, 

 and does not in the whole of Europé 

 transgress the 20th degree east longi- 

 tude. From Europé it has spread to 

 the eastmost parts of Canada (New 

 Foundland and Sable Island to Nova 

 Scotia). From the above said north- 

 ern boundary, corrcsponding to the 

 year-isotherm of + 4 to +5 degrees, 

 it has ranged the whole of Europé and 

 northwestern A (riva (Algeria, Morocco, 

 to Madeira and the Azores) reaching 

 the year-isotherm of -l 20°, but surely 



Kg. 98. /'. polMonifoliu* Poöeb. Å, Late in the year deve- "Ot much t ransgrcssing it. SpecimeilS 



loped floating leaf from the top ol a brancb, }. B Floating leal ol fr()m Maduqusair lield for P. poh/Uo/li- 



tbe t. norvegtcu* Haostb., ,. C, Floating leal "i tbe I. maderensls J r • '•' 



Haostk., j. 1>, Part of a transverae Beotion of the stam, ap, epi- foliuS are /'. jHirtlldt us HAOSTB. 



dermis, /, lacnna, i, interc llnlar canal, f, Btrengtbening liM^, /<, bast- ......... 



bnndle, '/• /■:. Pistil, a Bide riew, b back riew, e, from above, ',". All ÅSiatlC (list limit ion-area is al BO 



recorded (»Siberia altai (Led.) to Mön- 

 golia, and China to India and Japan*: Ar. Bknnett, Pot. polygonif. in Bot. Gaz. 

 1901, 59. »Sibirien bis Ostasien-: GrAEBNER, Pot. 11)07, 66). 1 1 1 1 1 I have scen no 

 specimens of brue P. polygonif. from those regions, and the Bpecimens reoorded Ironi 

 New Zealand may be the new Bpecies treated of here below. 



V. coloratns Vaxll. 



In IIornkm \N, Flora. Danira, 1813, t. 1449. 

 Roemer et Scin i/iks, Syst. reg. Ill, isis. 504. 



/'. plantagineuå Du Croz ap: 



/'. In lodi s I )i MTOÄT1BR, Flor. 



