276 



J. O. HAGSTROM, CFUTICAL RESEARCHES ON THE POTAMOGETONS. 



petiolatus WOLFG. 184, 189, 241. 



Phiala Post, Pl. Postianae fasc. VJ, in Bull. Hcrb. BoiBS. 



I, 1893, 409. — 74. 

 phialensia Post, 1. c. — 60. 

 phäippinensis Ak. Benn. 57. 

 pinguis Tis., Pot. Buec. exs. III, 1897, n. 126: pect. L., 



f. 19, 



pinnatU8 FlSCHER, 1. C, 1907. 110: pnsillus L., f. 

 pinnatus Walter, Fl. Carol. 1788, 90 ( = Myriophyll. 



scabratum, ex SCHtn/r., Mänt.». 

 planifcHiui .Mkvki:, Chloris han. 1830, 523: crispns L., 



v. — 60. 

 plantagineus Du Croz. — 155, 178. 

 Plantago Bastard. — 176. 

 platycarpus Fisch. — 102. 

 platyphyUus Mkyei:. 1. c, 520: gr amin. L., v. (is plathy- 



phyUus Rchb. /c/ .M. & K.). — 207. 

 pleiophyllns ii igsi r. 159. 



/Kila ris HAGSTR. — 17, 19. 



polygonifolius POURR. - 5, 67, 146-150, 175-180. 



182, 185, 192, 193, 215, 220, 263. 

 polygonif. X gramin. (/'. Seemenii Asch. & Gr.). — 231. 



232. 

 polygonif. X gramin. t ex EtOTJY: P. cariifolius THORE 



ex R. 193. 



polygonif. X heteroph. t ex Beebt, ap. Fkvf.k, Pot. Brit. 



Isles, 1898, 21: polygonif. Pourr. f. canceUata Prter, 



1. c. - 178. 

 polygonif. X pralongua i/'. Macvicarii Ar. Benn. in Ann. 



of Scott. Nat. Hist.. 1907, 106) ex Graebn. Pot., 



in EnGLER, 1. C, 1907. 139. 



polygonif ormis Hagstb. 113. 



polygonns Cham. & Scbx. 67. 80- 82. 85. 108. 112 



— 113. 

 polyphyUua Mor., in Coult., Bot. Gaz. V, 1880, 51: p«- 



8tK«« L-, v. - 124, 125. 

 pdlystachyus Schtjltes, .Mantissa in vol. III C. a LinnJ 



i. etc., 1827, 364: pect. I... v. 

 porcatus Mim... Cat. pl. Amer. sept., 1813, 18 (.Funnw 



leaved Pondweed» Mini. Specimens in herb. 



J. !'.. Sm., lab. •■/'. porcatum n:<> 54. l793»iBsaid to 



i>c /'. sjnrilhis Tuck., ex An. Benn. in The Journ. 



Bot. 1890, 207 i. 



porrectifoliua Ar. Benn. ap. Graebner, Pot. in Engler, 



I. c., 1007, 83: Zizii M. K., var. 

 porrisens II \<.~ 1 i: 169, 172. 



poriorieensia Graebn. in Urban, Symb. antill. IV, 1903. 



7.'!: /iri, .-i/I i mm //.s'4'll. H Scill... V. I 10, 186. 



prcelongifoliua Fisch., 1. <■.. 16: alpin. Balb., f. 

 praslongifoliu8 Tis. 224 227, 230. 

 pnBlongna Wi u bn. «. 7, LO, 12, 61, 62, 63, 144, 149. 

 152, 177, 215, 228, 234, 241, 243 217. 260 255, 



257, 25*. 



pr al. / eriaput ex åscH. & Gr., Byn, mitt. Fl. I, 1897, 



pral. / gramin. ex Asch. & Gr., I. <•., 330 

 pral. X håterophyUut t ex Ar. Benn. in Journ of Bot 

 1903, 166. 



pral. X Inrrns* (/'. ilriipirns Xm.ll.l c\ A-MI., Flora 



Prov Brand! etc. 1864, 662. 243 



pral. X polygonif. (/'. Macvicarii An. Bknn.. in Ann. 

 Scott. Nat. Hist. 1907. 106). 



pral. x Zizii ex Graebner, Pot. in Englbr, 1. e., 1907. 



139. 

 Preussii Ar. Bknn. 87, 108, 114. 129. 

 prolisus Kticii, Syn. Fl. Genn. et Helv. 1844, 775: un- 



tans L.. v. - 192. 

 prolixus Ha<;.-tr. 254. 256. 

 promontoricus Hagstb. - 175, 182 — 183. 

 protensus Asch. & Gr., Syn. etc. 1897. 314: perfci. L., 



subv. 

 protensus CHAM. & SCHL., in Limnra 1827, 190: periol. 



L., f. 

 protensus Fisch., I. c, 1907. 37: notan* L. f. 

 protensus PiSCH., I. C, 61: Schreheri V., f. 

 protensus YV.u.i.r. — 48. 

 Proteus Cham. & Schl. - 205, 210. 221, 233. 



prusstCUS HAGSTR. (alpinus X perjoliain* ). 148. 



pseudo-densus ASCH. ».V <In.. Synopsis ot<\, 1897, 314: 

 perfol. L., var. — 256. 



pseudo-fluitans Stme, Engl. Bot. IX, 1869. 28: poly- 

 font/. Pourr., var. I7s. 



))scudolueens HAGSTB. (illinoens. X Ute.). — 199,200. 

 p8eudomarinu8 Ar. Benn. in Tians. Norf.& Norw. Nat. 



Hist. Soc, 1882, 381: pectin. I... v. 

 pseudo-nitens Ar. Benn. in Journ. of Bot. 1881, 344: he- 



terophyUu8 Schreb., v. 207, 231. 

 pseudopoljgronns Hagstb. 81. 



pseudo-rutUuS Ar. BENN-, in 1. e., 1901. 4: ]>us. L., v. 

 pseudo-Zizii HaGSTR. (/'. gram. X Min. X lurens). 



200, 210. 

 psUostochyUS GDSSONE, Fl. sie. Synopsis II. IS45. 790: 



Inc. I,., var. 

 puleheUus Tis. 244, 245. 

 pnlcher Tockerm. 10, 151. 163, 158. 

 pulcherrimua Hagstr. 214. 

 pumUus Nuttaix, ap. Ar. Benn., Hem. etc in Ann. 



Natnrli. Hofni. Wien. 1892. 202 | Hohhinsii 



Oakes, ex Benn., 1. e. |. 



puniilus WOLFG. - 139. 



purpurascens Seujl, in Presl, Fl, Cech. 1819. 37. I II, 



142. 

 1'urshii Tuck., Observ. in Am. Journ. Sci. and Arts, 



1848, 228 196. 



puaUliformia Hagstr. (mucronatus x pus.). 97 98. 

 puaUloidea II lgs i r. 1 12, 1 15. 

 pusillns L. 9, 13, 63, 64. 72. 75. 70. 88. 90, 91, 93.94. 



07 104, 107, I 16, I 17. 118. 120 129, 134, I 19, 



160, 196, 250. 202. 203. 

 jinsiliiis x trirh. (/'. franconicua Fisch. ). 104. 126. 

 puaiUua X Voaeyi (/'. laterolia Mor.) ex llu.-n; 



126. 127. 



puyenaia Hagstr., New Pot. in Bot. Not. 1908, 107: or- 



gutvlua Hagstr., f. 

 pycnoafogua Khu.m. ;i|>. Hagstr. Cfr. Tra., L c, 111. 



1897. aotuln 1 15 no. 16. 18. 

 pygmaoidea II los in. 192. 



pygmaua (i\ri>i\. Fl. helv. I. 1828, i<'>7: milans L., v. 



192. 

 pygmaua II igs in 124, 







