268 



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



dimorpli. X pusillus (P. dhnwphoides Hag,Str. )• — 263. 

 dissimilis Ae. Benn., New Pot., in Journ. of Bot. 1910, 



150. — 52, 53. 

 distaehyus Bellardi. — 205. 

 distachyus Fiscii., Bern. Pot. etc. in Mitt. Bayer. Bot. 



Ges. 1914, 106: Zizii M. K., lusus. 

 dlstinctus Ak. Benn., Notes etc. in Journ. of Bot. 1904, 



72. — 198, 247, 248. 

 divaricatus Wolfg. — 221. 



diversifoUus Barton, PI. Pliiiad. Prodr. 1815, I, 27 ( = 

 dimorfhus Raf. et setaceus Pursh, e Raf., Am. 

 monthly Mag. etc. 1817, 358). 

 diversifoUus Mert. & Koch in Rohl., Deutschl. PI., 



1823, 849: lucens L., var. 

 diTersifolius Raf. — 127, 134, 136—138. 

 Drucei Fryer. — 146 — 147. 

 Drummondii Benth., in Benth. & Mull., F1. austral. 



VII, 1878, 171. — 169, 172, 173. 

 drupaceus Lang, in Flora II, 1846, 472. — 40. 

 drapaceus Koci-i ap. Lang., 1. c, pectinatus L. p. 

 dualis Hagstr. (panormit. X pusillus). — 103, 104. 

 duhius TiS. — 217, 219. 

 Buschlii FisciL, Bayer. Pot. 1907, 42: gessnacensis FiscH. 



var. 

 elegans Tis. Pot. suec. exs. II, 1895, n. 85, 86: prcel. 



WULF. f. — 251. 

 elegans Wallich, Catal. 1828, n. 5178. — 156, 176. 

 elUpticij alius RouY, Fl. Fr. T. XIII, 315: prcelongus 



WuLF. p. 

 elUpticus G-AUD., Fl. liolv. 1, 1828, 467: natans L. v. 

 ellipticus Kirschlager, Fl. d'Als. 2, 114: fluitans Rth. 



var. 

 elongatus Bge ap. Hagstr. — 226. 

 elongatws Bge ap. Dalla Torre & Sarnth., FI. Tir. 



VI, 1906, 134: fiUformis Pers. var. 

 elongatus An. Benn. in Macoun, Cat. Canad. pi. V, 1890, 



371: pusillus L., v. — 124. 

 elongatus Ch. & Schl. — 117. 

 elongatus FisCH., 1. c, 37: natans L., f. — 1. c, 115: 



pusillus L. f. 

 elongatus Hagstr. — 60. 

 elongatus Kuehn ap. Abromeit, Ber. etc. in Scbr. Pliys. 



Ok. Ges. Kon. 1893, 43: fluitans Rth., f. — 188. 

 elongatus Langb ap. Hervier, Rech. fl. Loir, 1885, 49: 



polygonif. PouRR. var. 

 elongatus Mert. & K. ap. Rohl. Deutschl. Fl. I, 1823, 



845: heteroph. ScHR., var. (a dubious form). 

 elongatus Mert. & K. ap. Fieb., Pot. Bohm. 1838, 26 

 Cf. Reichenb., Ic. 1845, 24: ZiMi M. K., var. — 

 214, 215. 

 elongatus AVahlenb. — 94. 



epihydrum Raf. in Med. Repository VI: 5, 1808, 354 

 (by Ar. Benn. considered to be identic with P. 

 Nuttallii which is contradicted by the description 



of the subm. leaves: foliis submersis sub- 



cordatis: Raf., Med. Rep. 1811, 409. — The name 

 is to be rejected). — 139. 

 epihydrum (P. Clayt.) X angustijolius {Zizii) ex Ar. 

 Benn., Notes etc. in Journ. of Bot. 1904, 71 (sug- 

 tion of hybridity: Ar. Benn., 1. c. ). 



ericetorum Syme, Engl. Bot. ed. 3. vol. IX, 1869, 28: 



polygonif. PouRR., var. — 177. 

 eu-Cooperi Graebner. — 62. 

 eu-decipiens Ascn. & Gr. — 246. 

 excelsus Hagstr. — 235. 

 exignus Hagstr. — 104, 106 — 107. 

 exornatus Hagstr. — 256. 

 explanatus Mert. & K. — 184. 



exstipulatus Muhl., Cat. pi. Am. sept. 1813, 18 (not 

 further known; only described by a name: dHoI- 

 low-leaved pondweedii). 

 exstipulatus Willd. in Sohulte.?, Mantissa etc. 1827, 

 365 (A dubious form; = ped. L. ex Cham., Linnsea 

 1827, 166, and others). 

 extensus Tis. ap. Hagstr. — 225, 229, 230. 

 falcatus ASCH. & Gk., Syn. I 1897, 326: gramineus X 



nitens, var. 

 falcatus Fryer. — 209, 221, 231. 

 fallax Ascn. & Gr., 1. c, 330 {nitens X perfoliatus). 

 fascicidatus Wolfg. — 14, 17, 18. 

 Fauriei Ar. Bbenn. Notes etc. in Journ. Bot. 1904, 76. 



~ 84. 

 Faxoni MoR. — 200. 

 fennicus Hagstr. 24, 52. 

 ferrnglneus Hagstr. — 161, 162. 

 flbrosns Hag.str. — 160, 183, 195. 

 Fieberi Rouy, Fl. Fr., T. XIII, 320: pusillus L., race I. 

 filicaulis Schur. — 40. 

 filifoliiis Phil., Florula atac. 1860, 50 (= Ruppia ob- 



twsa Hagstr.). 

 filiforrals Pers. — 14—30, 33, 34, 43, 47. 

 filif. X pectinatus, ex Almqulst. — 20 — 24. 

 filif. X vagimdus, ex Fontell. — 24, 26. 

 fiUformis Raf., in Med. Rep. N. Y. 3: 2, 1811, 400 (can- 

 not be identified). 

 JPisc/jeci Graebner, Syn. mitteleur. Fl. 1913, 504: {^jer- 



foliatus X gramin., ox Fischer). 

 F'ischeri Hagstr. — 62. 

 flabellatus, Bab. — 22—23, 40, 41, 48, 49. 

 flabellatus Crep., Notes etc. 1864, 45: pectin. L., var. 

 flavescens Fiscil, 1. c, 116: pusillus L., f. 

 flexicaulis Deth. — 250. 

 flexuosus Weed. — 250. 

 floridamis Ar. Benn. — 198, 204, 235. 

 floridaniis Small; Fl. of the Southeast U. S., 1903, 37 



(probably belonging to the group AmpUfolii). 

 fluctuans Tis. Pot. suec. exs. I, 1894, n. 28—29. — 145, 



206. 

 fluitans Coss. & Germ., Fl. env. Par. 1845, 571: lucens 



L., V. — 237. 

 fluitans Rth, Tent. fl. Germ. I, 1788, 72 (Variously con- 

 ceived by different authors: Smith, Fl. Brit. 1800 

 = alpin. Bale.; so also Fl. Dan. t. 1450, but t. 2105 

 = P. sterilis Hagste. — Cham., Adn., 1815 = natans 

 L., var. — DC, Fl. fr. = rariifolius Thore, — 

 Meyer, Chlor. han. 1836 = oblongus Viv. a, etc.). 

 — 180, 184, 185, 217, 238, 240, 241. 

 fluit. X natans {P. Schreberi Fisch., 1. c, 59 — 01, = na- 



tans X nodosus ex Hagstr.). — 185. 

 flumineu.s Hagstr. — 225, 228. 



