4"^« année. N° 8. Août 1896. 



BULLETIN DE L'HERBIER BOISSIER 



]SrOTES 



JAPANESE POTAMOGETONES 



Arthur BEIViVETT 



It would seem by récent collections that Japan when throughly 

 searched, will be found to bevery rieh in this genus. 



Perhaps, nowhere eise in the world, in the same space, will be found 

 such a commingling of species as thèse isles afford. Species that occur 

 in some, or other of the five great divisions of the earth are hère found 

 in juxtaposition. 



It posseses endémie species in P. OxyphyUus Miquel. Prol. H. Jap. fas. 

 7, 325, 1867. P. Miduliikimo Makino 111. FI. Japan, t. 54, 2, 1891. (This 

 may be compared with P. lateralis Morong a rare N. American species). 

 P. nipponicus Makino 111. FI. Japan, t. 56, % 1891 (affinity of this plant ill. 

 understoad as yet),material being scanty. It shares with China, Manchuria 

 and Ussuria, P. cristatus Regel & Maack. H. Uss., t. 10, fig. 3, 6, 1851 : 

 with China, India, Siberia and Australia, P. Tepperi Ar.Benn. Jour.Bolany 

 178, 1887; and with the Ladrone (Marienne) Isles, China, Spice Archipe- 

 lago, and Bornéo, P. Gaudichaudii Cham. Linnsea, 2. 199. 1827. 



In the collection of the Père U. Faurie (Herb. Boissier) are spécimens of 

 P. zoserifolius Schum, a species otherwise rare in Asia, whence. I bave it 

 from « Lacus Baikal », and W. Siberia. P.prœlongus Wulf, is another rare 

 Asiatic species, I bave seen no spécimens other than Japanese, but Mr. H. 

 C. Watson reports it from the « Himalayas. » A near alley occurs in Aus- 

 tralia; ie, P. acutifolius Link., P. javanicus Haskl. Act. Soc. Neer., t. 26, 

 BULL. HERB. Boiss., août 1890. 37 



