Naias NAiADACtt.K 27 



ORD. CXXV. NAIADACEiE. 



(E. Meyer PreussensPflanzeiigattungen (1839) p. 64.) 



Flores unisexuales. moiioici vel dioici. Involucrum floris masculi 

 monandri duplex, feminei (in spec. Oricnlalibus semper) simplex 

 quodammodo ovarium uniloculare sistens, apice 2-3 stigmala gerens, 

 rarius duplex, tum inlerius stigmatiferum. Filamentum nullum vel 

 hrevissinuim. rarius elongatum, anthera 1-4-locularis. Ovulum soli- 

 tarium; erectum anatropum. Semen nucamentaceum involucro spa- 

 thaceo pcrsistenti inclusum exalhuminosum. Emhryo rectus macro- 

 podus radicula hilum spectante. — Plantie in aqua dulci et sub- 

 salsa vigentes. 



NAUS (L. G. 1096. — Caulinia \\m.). 



Flores monoici vel dioici ad hasin ramorum solitarii vel glomerati. 

 i/rtsc. Involucrum exlerius calyptneforine apice 2-4-fidum veltuhulo- 

 sum apicc attenuatum et denticulatum, inlerius cum aiithera coricre- 

 lum ct cum eadehiscens. Fem. Stigmata subulata introrsum papillosa. 

 — Herhjc aquatictB submersic annuiC, caulihus ramosissimis rigidis 

 gracilihus tblis linearibus spinuloso-dentatis vel subintegris hinatim 

 suhoppositis basi dilatatis, oblique decussatis, planis medianis parium 

 subsequentium spiraliter caulem amhieutibus, juniorihus in axillis 

 fasciculatis. Cf. cl. Magnus Beitrte^e zur Kenntniss der Gatt. Kajas 

 Berlin 1870. 



Sect. I. EuNAiAS Ascliers. FI. Brandenh. I. p. 669. — Flores dioici 

 solitarii. Involucrum floris masculi exterius obverse campa- 

 nulatum apice 2-4-dentatum. Anthera 4 locularis valvis 4 

 demum revolutis dehiscens. Caules plus minus aculeati. 



1. N. major (All. Ped. II. p. !2-21) caule ramoso lereti superne 

 pra?sertim aculeato, foliis lineari-lanceolatis acute repando-dentatis 

 dentibus spinulosis, vaginis foliorum iiitegerrimis, semine ovato 

 crustaceo duro obsolete reticulato-rugoso 0. Nees Germ. Ic. — A'. 

 marina L. Sp. 1441 ex parte. — N. monosper?nael j\\tetrasper?naWi\\d. 



Hab. in aquis lente fluentibus, pivninciae CaucasicB» (ex Ledeb), Persia ad 

 Asterabad (Ivarelinlj, desert. Arab. (Borszczovv!) regnum Cabulicum)GrifT!). 



Ar. Geogr. Europa, Asia temp. et trop., Alji;eria, Ins. Canar., Reunion, 

 America bor., Ind. Ooc.,Brasilia, Ins. Sandw.. Auslralia. 



2. N. muricata (Del. Egypte p. 375, tah. 50, flg I) caule ramo- 

 sissimo ut et rami transverse et crebre undique aculeato, foliis 



