NAJADE.ii 249 



superiora ovato-oLloBga sub-cordata, spica cylinclrira 

 brevis pedunculata. P. Jluitans non differt nisi foliis 

 utrinque attenuatis nec sub-cordatis. 



^ 2. P. ohlongus — Viv: fragm: fl: ital: fasc: I. 

 t. 2. = DC. £1: fr: suppl: p. 3 10. = P. natans var: 

 Spr: syst: I. p. 49^- ( ^'^ paludosis sutnmi verticis 

 della Scaggia supra Pegli \n plaga occid: Ligiirice 

 Viv: 1. c). DiiTert a prcecedenti statura minori, foliis 

 conformibus , sed pariter natanlibus nec submersis, 

 latnina angustiore utriuque acuta , stipulis longiori- 

 bus j ceterum simillimus. 



# 3. P. rvfescens = Spr: sjst: I. 49^- ^^ Scbrad: 

 = P. ohscurum DG. fl: fr: suppl: p. 3 11. P. Jluilans 

 Sui: non Roth: P. serratum Roth: non L. P. alpi- 

 nuni Balb: misc: bot: p. i3. = P. annulatum Bellard: 

 Act: Taur: vol. VH. p. 44^- ^' ^* ^- ^- {Llu^" pas.siiE. 

 Pedem: in alpibus Augustanis , specialim in lacu Clia- 

 mollet Balb: 1. c. et in parvo lacu di Brona BrLLATtr: 

 sub P. annulato). Tjndique rufescens, folia infcriora 

 sessilia lanceolata superfora brevi-petiolata ovato-ot- 

 longa, stipulae lato-lanceolatte, pedunculus folia sub- 

 sequans. 



^ 4- P- heterophjllus = Scbreb: spicil: p. 21. = 

 Spr: syst: I. 49^- P- heterophyllum et gramineinn^SSi . 

 sp: I. 713. 716. DC. fl: fr: n. 1872. 1873. = Oed: 

 fl: dan: t. 22. Raj: angl: III. p. i^Q. t. 4- f- 3. (^i/?:, 

 Amer: bor: Pedem: secus Padum in aqua minus pro- 

 funda, in rivub's prope J illaregia , Caselle , la Ve- 

 neria All: n. 882. sub P. gramineo. Re fl: tor: L 

 p. 109. In orvzis uliginosis uli alla Torreita dei Bnr' 

 nahiti vulgaris P. heterophyllus Biroli fl: acon: I. p. 53. 



