— 30 — 

 Ordo L Potamophila nob. 



Calamophyta aquatica, partim minuta et anomala, poly- 

 morpha (iz: Proteaceis), partim graminea ; embryo exalbumi- 

 nosus, quibusdam di- tetracotyhs. 



FAM. 41 LEMNACEiE. 



Plantula3 acaules, aquaticaej radicellis calyptratis v. arrhi- 

 zse, spiriductibus -+- — evolutis. Flores mono-diclini e fis- 

 sura raarginali v. pagina frondiculae, spalha tenerrima, mon- 

 diandri, anthera biloculari, transversim dehiscente ; ovarium 

 uniloculare, ovulis 1-7, erectis v. horizontalib., ana-amphi- v, 

 orthotropis. Capsula indehiscens, mono-plcjosperma, embryo 

 exalbuminosus : Wolfia^ Lemna^ Telmathojjhace, Spirodcla. 



F A M. 42. P O D O S T E M A C E ^. 



Hbse submersae, exoticas, Muscos, Hepaticas, irao Fueos e 

 p. siraulanles, spiriductibus destitutae, radiculis minimis adflxie, 

 phyllodils alternis, integr. v. lobatis ct filif. , astomisj cauli con- 

 tinuis. — Flores. raono-diclini, axill. v. terra., solitar. v. aggreg. 

 spicative , spathacei , sepalis O v. 2 - 3 - pluribuSj interdum 

 miilateralibus ; stam. 1, 2, c», hypogyna, inlerd. unilater. v. 

 monadelpha et quaedam ananthera, anlheris normal. <J , dorsi- 

 V. basifixis, ovatis v. oblongis. Orar. 2-3-loc. v. septis incom- 

 pletis unilocul. , ovulis CXDadscend., araphitropis, slylo indi- 

 viso V. 2-3-fldo. — Capsula 2-3-locul. septifraga, valvis 2-3, 

 placentam seminiferara nudantibus; seraina niinuta, imbri- 

 cata, exalbum., erabryone dicotyli , radic. brevi : — Genera 

 10. Mniopsis, Sphoerothylax , Hydrobryum, Podoste?non, Blan- 

 dovi>iai Moui^era, Lacis^ Tjisticha; — Hydrostachys et //a- 

 lophila ? 



FAM. 43. CERATOPH YLL ACE.«. 



Hbae subraersae, spiriductib. destilutye, caule ramisque le- 

 retib. articulatis, phyllodiis vcrticillatis, dicbotonio-filiformib.. 



