274 



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



myriophyllus Eobb., in Asa Grat's Man. Bot. 1867, 



487: gramin. L., v.? — 206, 209. 

 mysticus MOR. — 259. 

 najadoides Graebner. — 60. 

 natans L. — 12, 134, 146, 147, 152, 163, 176, 184, 185, 



189, 191—197, 209, 215, 216—220, 234, 237—241, 

 242, 257, 263. 



natans X al-pin. 9 (P. Drucei Frter) ex Frter, Pot. 



Brit. Isles, 1898: 31. — 146. 

 natans X gramin. ex AscH. & Ge., Synopsis, I, 1897, 



333. — 215. 

 natans X lucens ex Beebt, On P. fluit. Rtli in Journ. of 



Bot. 1890, 204. 

 natans X nodosus ex Hagstr. — 185. 

 natans X polygonifolhts ex Almqu. in Bot. Not. 1889, 



66. 

 natans X pdlygonifolius (P. gessnacensis Fiscn., Beitrage 



etc., in Mitt, bayer. Bot. Ges. 1905, 472 et in 1. c. 



1907, 42: wahrsclieinlich: P.). — 185, 192, 193. 

 natans X polygonif. 9 (P. Kirhii Stme) ex Fryer, ap. 



LiKTON, Hybr. etc., in Journ. Bot. 1907, 300. 

 natans X trichoides (P. varii^olius Thoee) ex Hagstr. 



— 193—195. 



natans x Zizii (P. crassifolius Fryer) ex AscH. & Gr., 



Synopsis etc. 1897, 332. 

 navicularis Hagstr. (gramin. X prcel.). — 232. 

 neidensis Hagstr. — 227, 230. 

 nericius Hagstr. (alpin. X gramin.). — 145, 203. 

 nerviger Wolpg. {alp. X prcelongus). — 149. 

 nervosior Hagstr. — 63. 

 niagarensis Tuck., Observ. in Amer. Journ. Sci. and Arts 



1849, 354. — 91. 

 nigrescens Fr. — 205, 208, 209, 230. 

 nipponicns Making, HI. Fl. Jap. I, 1891,2, t. 58 (The 



material is scanty: Benn. in Journ. of Bot. 1900). 



— 57, 198. 



niiens Cham., Adnot. ad fl. berol. 1815, G: lucens L., p. 



— 235. 



nitens FiscH., Bayer. Potamog. 1907, 68: Zizii M. & K., v. 

 nitens Willd., ap. Cham., 1. c, 6 (= nitens Cham.). 

 nitens Weber. — 11, 148, 201, 209, 210, 216—218, 221 



—231, 233, 244, 252, 254, 255. 

 nitens X heteroph. ? ex Fryer, Supposed liybr. etc., in 



Journ. of Bot. 1890, 178. 

 nitens X perfoliatus ex Gr., Pot. in Engler, 1. c, 1907, 



138. 

 nodosijolius Hagste. — 220. 

 nodosus Poieet. — 7, 12, 147, 148, 154, 155, 162, 183— 



190, 192, 195, 200, 201, 220, 235, 237, 242, 248. 

 nodosus X Nuttalii (P. subsessilis Hagstr.). — 190. 

 nodosus X Michardsonii (P. rectifolins Ar. Benn.) ex 



Hagstr. — 148, 190. 

 Noltei Ae. Benn. — 98. 

 Noltei FiscH., Beitr. etc., in Mitt, bayer. Bot. Ges. etc. 



1904, 375. — 185, 238. 

 normalis Tis., Pot. suec. exs. I, 1894, n. 22: gramin. L., f. 

 norvegicus Hagste. — 177. 



notabilis TiS., 1. c, II, 1897, n. 133: pectin. L., f. — 49. 

 Notarisii Gandog. — 58. 

 novceboracensis MoE., Eevis. N. Am. Naj., in Mem. 



Torr. bot. Club III: 2, 1893, 20—21: lonchitis 



Tuck., v. 

 Novce-Anglice Hagstr. — 120, 121. 

 nnmasakianns Ae. Benn., Notes etc. in I'Ann. Conserv. 



Geneve, 1905, 104. — 129. 

 Nnttallii Cham. & Schl., De plan tis etc., in Linnsea, 



1827, 226. — 4, 121, 134, 135, 139, 140, 155, 170, 



189, 190, 200, 201, 262. 

 Nuttallii X gramineus (P. concilius Ar. Benn., Journ. 



of Bot. 1908, 250). 

 Oakesianus Eobb. — 196, 197. 

 oblongifolius Ar. Benn., in Ber. Schw. bot. Ges., 1896, 



96: perfoliatus L., v. 

 oblongifolius DuM., Fl. belg. 1827, 163. — 256. 

 oblongifolius Hooker f., Handb. N. Zeal. Fl. 1802, 742 



(is P. Oheesemanii Ae. Benn. ex Benn.). 

 oblongo-rufescens Schultz, in Flora, 1849, 230. — 148. 

 oblongus Schneider, in Verb. bot. Ver. Brand., 1872, X 



(is P. gramin. L. v. terrester Fr., ex Graebner). 

 oblongus Spennee, Fl. frib. I, 1825, 32: perfol. L. '(. 



— 256. 



oblongus ViV. — 175, 180. 



obovatifolius Tis., ap. Fryer, in Journ. of Bot., 1891, 



289: nitens Web., f. 

 obrntus Wood, Classbook, 1845, 170 (is P. alpin. Bale., 



f., ex RoBB., in Gray's Man. 1867, 486). 

 obscunis DC. — 141, 143. 

 obtusifolius PiEB., Pot. Bohm. 1838, 32: crispus L., p. 



— 59, 61. 



obtusifolius Meet. & Koch. — 7, 20, 22, 56, 58, 64, 91, 



96, 97, 99, 105, 106, 109, 115—121, 205. 

 obtusif. X Friesii{P. semifructus Ar. Benn.) ap. Graeb- 

 ner, Potam. in Engl., 1. c, 1907, 138). — 96. 

 ■ obtusifol. X panormitanus (P. SturrocMi Ae. Benn.) 



ex Hagstr. — 117. 

 obtusifol. X pusillus ex Almqu. in Bot. Not., 1889, 66. 

 obtusifol. X ptisillus (P. saxonicus Hagstr.). — 118. 

 obtusifol. X trichoides (P. gallicus Hagstr.). — 118. 

 obtusifolius Meyer, Cblor. ban., 1836, 523: hicens L. f. 

 obiusior FiscH., Bayer. Potam. etc, 1907, 101: mucro- 



natus ScHR., f. — 95. 

 obtusus Du Ceoz ap. Gaud., 1. c, 1828, 468. — 141. 

 obtusus FiEB., 1. c, 38: obtusifol. M. K., f. 

 obtusus Hagstr.: suecicus Richt. 8. — 20, 22. 

 obtusus Hagste.: nitens Web., f. — 226, 230, 231. 

 obtusus Schlechtend., Fl. berol. I, 1823, 117: compressus 



L., V. (is obtusifolius M. & K: Schult. Mant.). 

 occidentalis Graebner, Potam. in Engler, 1. c, 1907, 



91: nitens Web., C- 

 occidentalis Robb., in King's Explor. 40 Mer. U. S. A., 



1871, 339: marinus L., v. — 18, 19. 

 occidentalis Sieber. — 184. 

 oclireatus Raoul. — 10, 58, 79, 86. 

 octandrus Poieet ap. Lam., Enc. Suppl. IV, 1816, 534 



(= Hydrogeton-s'pecies). 

 octandrus Reichenb. herb., ex Ar. Benn., in Ann. Nat. 



Hofm. Wien, 1892, 288 (is javanicus Hassk. ex 



Benn.). — 131. 

 odontocarpus Gandoger in Bull. Soc. bot. France, 3, 



ser. VI, 1899, 393 (planta dubia). 



