— 100 — (8) 



10. P. javanicus Haskl. Ad, Soc, Neerl. 1, 26, 1856 

 = P. tenuicaulis Muell.! Frag. FI. Austr. 1, 90 and 244, 1858. 

 — 7. 217 = F. parvifolius Buch. ! in Reliq. Rutenberg., 32, 1880 

 = P. hybridus Hook. et Thorn. non Michx « Khasia »! = P.Eud- 

 lensis Wehvitsch in herb. Kew î = P. octandrus Reich. in herb. î 

 non Lam. 



3 sbeets collected by Goudot in Madagascar (circa 1839) in a 

 younger state tban usual. Tbis plant is evidently one of tbe 

 comnioner species of tbe genus in tbat country. Wbetber ail tbe 

 spécimens referred to tbis species are really so is difficult to 

 décide. ïbere is some discrepency ainong autbors as to tbe 

 nervation. Mueller says « foliis subniersis... uninervia. » Bucbenau 

 does not notice tbe nervation of tbe submerged leaves, neitber 

 does Bentbarn and Hasskarl. 



In spécimens from Nyssa Africa Barter n° 1089 tbere is a 

 central nerve witb one on eitber side. In Anstralian spécimens 

 « Centennial Park. Port Jackson District », tbe submerged 

 leaves are 5-veined. 



11. P. Preussii Ar. Benn. — «P. javanicus Hask. — 

 Kamerun. Af 'rica-Staudt. 462 ». — Not javanicus, but is P. Preussii 

 Ar. Benn. in FI. Trop. Africa VIL 2. 222, 1901. 



12. P. perfoliatus L. var. mandschuriensis Ar. Bennett, 

 var. nov. 



Usually differs from tbe ordinary Asiatic form of tbe species. by 

 tbe ligbter color of tbe foliage, tbe longer internodes of tbe lower 

 parts, tbe elongate undulate leaves with waved margins, mucb 

 like on a small scale tbose of tbe N. America var. Richardsoniï 

 Ar. Benn. Tbis form seems to prevail tbrougbout Mandscburia, 

 near it in Soongaria (Scbrenk!) wbile tbe Mongolian spécimens 

 Gobi; Krigbignor! leg. Potanin, are more like tbe tbin-leaved 

 states of tbe ordinary plant. Spikes tbicker, with more numerous 

 fruits, and tbe central keel (carina) is decidedly winged. I bave 

 seen Litwinow's n os 405, 424, 425, 474, 2480, 3348 and 3413 

 wbicb represent tbis form. 



In Siberia and Japan tbe spécimens are mucb darker in 

 color, except one of Turczaninow from Ircutia 1828, wbicb is very 

 like tbe Mandscburian spécimens. 



Tbe typical forms of P. perfoliatus in N. America are mostly 



