155 



iinbrlcata, in caule ramisqiie decurrentia et cum eo colliquescen- 

 lia, tenerrinia, stomalihiis destituta, integra v. liiciniata, laciniis 

 plerumque capillaribus. Stipulae nullae. Flores parvuli, per- 

 fecti V. imperfecti, axlllares v. terminales, solitarii sive aggregati, 

 distiche spicati v. subraceraosi, singuli intra spatham simplicera 

 tubulosam, irregulariter rumpentem, v. di-tri-polyphyllam, pri- 

 mum sessiles, dein saepissinie in stlpitulo plus rainus longo, basi 

 a spatha vaginato elevati. Perigonium nunc nullum, nunc di- 

 tri-polyphylluni, foliolis distinctis, membranaceis, concaviusculis, 

 angustis, acutis, interdum unilateralibus. Stamen unicum, duo 

 V. indefinita, sub germine inserta, illud cingentia v. unilateralia, 

 eidem adpressa; Jilamenta distincla v. basi cohaerenlia, rarius ia 

 tubum coalita, compressa, acuta, apice interdum bifurca, non- 

 nulla saepius ananthera; antherae introrsae, biloculares, dorso 

 supra basim affiAae, v. basi insertae, ovatae v. oblongae, loculis 

 oppositis, conliguis v. conueclivo inlerpx>sito sejunctis, longitu- 

 dinaliter dehiscentibus. Germen globosum v. ellipticum, di-tri- 

 phyllum, bi-triloculare, trophospermiis e loculorum angulo centrali 

 late tumentibus, v. septis incomplelis uniloculare, trophospermiis 

 ad carpophyllorum margines parietalibus. Gcmmulae plurimae, 

 adscendentes, ampbitropae, raicropyle prope punctum insertionis 

 fere basilari. Stijli carpophyllorum numero, indivisi v. bifidi, 

 persistentes, intus stigmatosi. Capsula costata, stylis superata, 

 bi-trilocularis, septifrage dehiscens, valvis trophospermia in co- 

 lumnam cenlralem coalita nudantibus. Semina plurima, minima, 

 in Irophospermii foveolis erecta, imbricata, integumento exteriore 

 tenui, pellucido, laxo, celluloso, mucilaginoso, interiore solido, 

 fuscescenti-bruneo. Embryo exalbuminosus, rectus, coUjledoni- 

 bus duabus plano-convexiusculis, radicula brevissima, infera. 



G E N E R A. 



1831. Mniopsis ^ffl^r^ 1834. Lacis Z?>^A 



Crenias S^rewg-. 1835, Trisficlia T/iouars. 



183|. Hydrobryum £^w<//. Dufouiea 5ory. 



1832. Podosfemon L. C. Rich. Finiocrena Bonir, 



Dicraeia iVio««r«. Genera dubia. 



1833. Mourera /4,v/>/. monc tr , , , rri 



Lacis Schreb. ^^^^' Hydroslachys Thouars, 



a. Neolacis Cham. 1S37. Halopliila T/iouars. 



h. Marathnim //. et B. 



c. Mouievei Aiihf. 1 Lemnopsis 2! tppel, 



Affiuitas. Ordo diu cum Najadeis et Juncagineis confusus, al) iisdem 

 embryone manifeste dicofyledoneo longe alienus est, (luo ad veram affinitatem 

 niagnopere dubius. 



Creo^rapllia. Podostemmeae, quarum nonnullae Muscos et Junger- 

 mannias habitu mirabililer ludunt, aliae foliis capillaceo-mullifidis et capsiilis 

 costatis distylis Uinbelliferam planfam mentiunlur, v. fronde lobata cum caule 

 coalita Fucos quosdam referunt, inter tropicos Americae et Asiae, Jiec non in 

 Madagascaria, in maris erylliraei ora et in insulis Mariannae, aquas quietas 

 et aestuaria incolunt, radiculis minimis ad scopulos v. ad arborum truncos de- 



