872 NOTES ON POTAMOGETONS. 



P. FLUITAN8 " Roth." Specimens probably of this (certainly not 

 P. natans L.) occur in Sikkim, Hook, d- Thomson, 9000 ft. {Herb. 

 Vienna !) ; " India," Herb. Wright 1212 in Herb. Glasgoiv. ; Punjaub. 



P. EUFESCENS Schrad. Tibet; Nag-hoti, 15,000 ft., Strachey d 

 Winterbottom, No. 3. In neighbouring countries it occurs in Af- 

 ghanistan, according to Boissier's Ft. Oricntalis; Davuria, Tiirczinow. 



P. Zizii Eoth. Occurs in Kashmir, C. B. Clarke, 5150 & 29139 

 (Herb. Vienna I) ', Jacquemont, No. 393 [Herb. Kew\), and No. 613 

 {Herb. Paiisl); Himalaya, 6400 ft., Strachey d Winterbottom {Herb. 

 Kew\); Tibet, Hngel {Herb. Vienna\). It also occurs in Turkestan 

 {Herb. Petrop.) and China, Abbe DeJavay {Herb. Paris). 



P. DEciPiENS Nolte. Nynee-Tal. 5, 1845, Griffith {Herb. Kew !). 

 This and Dr. 0. Duhumberg's 1881 gathering in PI. Altaica are 

 the only Asiatic records I possess. 



P. PR^LONGUS Wulfen. Mr. H. C. Watson in Comp. Cybele Brit. 

 p. 344 (1869), gives this as a plant of the Himalayas. I do not 

 Imow where he obtained this record. Tlie only part of Asia I have 

 seen it from is Japan, where it occurs in a few lakes, gathered by 

 the Abbe Faurie in 1889 {Herb. Paris); and it is reported from 

 W. Siberia. 



P. FiLiFORMis Nolte. Shardo, C. B. Clarke, at 7700 ft.. No. 

 30502; Gwalior, C. Maries, 1890 {Herb. Mus. Brit. I). 



At page 567 Sir J. D. Hooker has curiously misplaced " subsp. 

 flabellatus" under P. pusillus ; of course he meant it to go under 

 P. pectinatus, 



I find in the herbarium of M. Casimir DeCandolle specimens of 

 P. polygon if alius Pourr. var. pseudo-Jluitans Syme, under the name 

 of " P. natans L. var. intermedins.'' These specimens were sent to 

 M. DeCandolle by Koch in 1824, and he speaks of them as being 

 the plant described in Kohling's Deutschl. Flora, ed. 3 (which was 

 edited by Mertens & Koch), page 836 (vol. i., 1823). Although 

 polygon if alius had been separated from natans by Pourret, Viviani, 

 Ba'tard, and others at this time, still it was generally i^laced under 

 natans as a variety ; Chamisso's adoption of it as a species was the 

 first real contrasting of its difi'erences, &c., from natans. The 

 extreme tenuity of some of the lower leaves is well shown in these 

 examples ; they will scarcely bear breathing over without being 

 disturbed. Chamisso seemed to be uncertain as to where this form 

 should go, he evidently having seen no specimens. 



The DeCandollean herbarium also contains a complete set of 

 the species and varieties of the 3rd ed. of Kohling's Flora, con- 

 tributed by Dr. Koch in 1824, with references, to the Flora; a very 

 valuable series. 



In fasc. 119 (April, 1894) of the Flora Brasiliensis, Dr. K. 

 Schumann describes the Brazilian Potamogetons, and figures four 

 species. He admits P. Jluitans Eoth as a species of Brazil, and 

 describes the fruit, evidently, from his note, not thinking that there 

 are two plants under this name, but considering that the vegetative 

 power may in some cases exceed the fruit-forming power. I must 

 admit that I am not sure of any specimens of Jiuitans in mature 



