160 THE JOURNAL OF BOTANY 
NOTES ON POTAMOGETON. 
By Artuur Bennett, F.L.S. 
(Continued from Journ. Bot. 1907, p. 377.) 
x PotamoGETON Cooper (=crispus x perfoliatus) Fryer in 
Bot. "Biol Club Rep. for 1895 (5 June, 1897); Pot. Brit. Isles, 
48, = 31, 32 (1900). 
P. perfoliatus var. Jacksoni F. A. Lees in Bot. Rec. Club Re- 
port for 1880, 150 (1882). 
P. undulatus v. — Fryer in Journ. Bit 1891, 289, t. 313 ; 
Cooper in Trans. Lei t. Soc. iii. 397 (1894). 
x P. cymatodes sine & Graebn. Syn. Mitteleur. Fl. i. 337 
(27 Aug 1897). 
Mr. Fryer’s name clearly takes precedence over P. cymatodes. 
Ascherson and Graebner place it as P. perfoliatus x Crispus, 
while Mr. bis gives it as crispus sé perfoliatus, his reason for 
so doing being founded on careful observations of the plant in the 
field and in cultivation 
Mr. Fryer at first yeferred this to P. undulatus Wolfg. = 
crispus X prelongus Caspary; but this was corrected by Beasts 
in Bot. Tidsskr. xxi. 221, t. 7 (1897). The plant of Wolfgang was 
gang, gathered by him in Lithuania. Baagée found it in Den- 
mark, and sent me a "beautiful series; Caspary in West and East. 
Prussia ; Ascherson and Graebner give it for Schleswig-Holstein, 
but it is not pon ee in Prahl’s Krit. Flora Sch.-Hol. 1890. 
P.N s Poir. Herr Baagée in his account of the Avo 
secre gathered in " Lieut. Olufsen’s second acy ir expeditio 
) 
P, AMERICANUS Cham. (P. lonchites Tuckerm.). To this are 
doubtless to be referred, as geographical varieties or eae 
P. occidentalis Sieb., P. Leschenaultit, P. O- fe ihiensis, P. syriac 
arensis, P. marianensis—all of Chamisso & Schl lechtendahl 
which has (or had) such highly vaectaftaad ila. with fifty endemic 
genera of plants, all the Potamogetons save two are widely spread 
ES ier ice ae 
