298 THE NOMENCLATURE OF POTAMOGETONS. 



from Muhlenberg, named " P. porcatum, No. 54, 1793. Penn- 

 sylvania/' It lias received several names ; among others : — 

 P. Zetterstedtii Wallman ap. Sch. et Mohl. Bot. Zeit. i. 256 (1843) ; 

 P. diversifolius Eafinesque, Medical Reports, ii. 46, 1811, non 

 Barton; P. delicatulus Bert. Misc. Bot. 15 (1854); Zanniehellia 

 Cochlospermum Al. Braun in Herb. Berlin ! ; Spirillus Tuckcnnanii 

 Gay in Herb. Kew ! ; Cochlosperma Nuttall Herb., fide Trimen, 

 Journ. Bot. 1879, 314. 



P. pauciflorus Pursh. Fl. Amer. Sept. i. p. 121 (1814). P. 

 foHorum Eafinesque, Medical Reports, 46, 1811. " P. gram.. Michx. 

 Fl. Bor. Am. nee non Linn.," Rafiuesque, I. c. — This is P. 

 exstipulatum Muhl. Cat. PI. Am. Sept. No. 8, in Herb. Willd. 

 n. 3206, fol. 1-3 ! (1813). — I am not aware that Muhlenberg pub- 

 lished any description of it ; if he did so before 1814, his name will 

 take precedence. P. cxstipulatus Bonpland MS. is P. angustifolius 

 H. B. K. Nov. Gen. et Sp. i. 370, and is to be referred to P. 

 pectinatus (aggregate). It is contained in Herb. Willdenow at 

 Berlin, No. 3206, f. 4, 5. 



P. mexicanus Ar. Benn. Journ. Bot. 1887, 289. — This was 

 named P. peruviana by Presl (ined.) in Herb. Prague ! 



P. angustifolius Presl. — The date of this is 1821, as I supposed 

 (Journ. Bot. 1889, 263): fascicles 1-10 of the 'Rostlin' were pub- 

 lished in that year; Roth's name P. Zizii (1827) is thus antedated 

 by six years. 



P. rufescens Schrad. — In writing of this (Journ. Bot. 1889, 

 243) I expressed an opinion that Roth's serratus (Fl. Germ. i. 73, 

 and ii. 205 (1788-1800) ) from his reference to the plate in Fl. 

 Dauica must be Ulceus, but he also refers under litems to the same 

 plate, so it must have been a slip ; and the serratus of the Beitrage 

 (ii. 126, 1783) most certainly, from the description, applies to 

 rufescens. 



P. Wrightii Morong, Bull. Tor. Bot. Soc. (1886) xiii. 158, t. 59. 

 P. viucronatus Presl, Epimeliaa Botanicaa, p. 215 (1849), non auct. 

 — This is No. 1381 of Cuming's plants from the Philippine Islands. 

 There is no doubt Morong's name is preoccupied by P. malaina 

 Miquel, 111. Fl. Arch. Ind. p. 46 (1871). A very poor and imperfect 

 specimen, communicated by Dr. Buchenau from Kashmir, W. Hima- 

 laya, alt. 5800 ft. (Schlagintweit, 9 Cat. No. 10449), I believe to be 

 the same, though there is neither flowers or fruit. It is named 

 Jluitans, which it is not. The fruit of /'. Wrightii is very distinct 

 and characteristic. 



P. Liebmanni Buchenau, Nat. Ver. Bremen, iii. 349 (1873). — 

 An authentic specimen of this plant, gathered by Liebman, and 

 communicated by Dr. Buchenau, is Schollera graminea Willd. = 

 Heteranthera graminea Vahl. ; so it would seem that this Mexican 

 plant must be excluded from the genus. 



v P. javanicus Hassk. — In this Journal for 18S7, p. 177, I ex- 

 pressed an opinion that this might be different from P. tennicaulis 

 Mueller ; but Dr. Schinz, of Zurich, who possesses a type specimen 

 of javanicus, assures me they are the same species; the P. parvifolia 

 Buch. must also certainly be referred to javanicus. The synonymy 

 will be — 



