~ 52 — 



c. 7ii^^^^/e(^; pollen 3-hilat. botelliforme; flores psendo-her- 

 maphrod.; sligma sessile, peltatum; drupula^ pedicellatae ; sem. 

 pendul. ; cotyledon radiculoe maximtie accumbens: — Ruppia. 



d. Potamogetonece : pollen glolDOS. , flores pseudo- herma- 

 phrod. stam. bracteata <i, stigma simpl. v. peltatum ; semen 

 pendul. V. perietale ; cotyledon uncinata, clausa vel circinato- 

 revoluta, rimosa. Folia passim nervoso-costulata, allern. v. op- 

 posila : — ZannicJiellia , Halodule , Altlienia ; Potamogeton. 



Or clo IL Glii m ifl or ae- 



Caulis saltem ad basin nodosus; folia simplicissima, vagi- 

 nantia, elongata < v. abortiva ; flores glum.icei -<J , pcrigo- 

 nio exili, ovulo solitario -«^ ; caryopsis, allDumine plerumque 

 farinaceo ; ultimis capsula polysperma. 



FAfll. 45. GRAMINACEAE. 



Herbae pusillae v. altissimse et arborescentes, passim ca^spi- 

 tosse et stoloniferae, culmo (caule) tereti v. compresso, nodoso, 

 fistuloso , rarius farcto v. ramoso, nodis rarissime ad basin 

 internodii summi restrictis. Folia e nodis alterna , vagina 

 fissa (petiolus culmum amplexans), supernc passim ligulifera, 

 lamina angusta, raro ovala, multinervi, integerrima, margine 

 saspe scabra. Florcs monoclini, rarius diclini v. polygnmi, in 

 spiculas 1 - co - floras, spicatas, racemosas v. paniculalas , ra- 

 rius in spatha aggregatas, congesti. Cuilibet spiculae giumae 

 (bractea3 steriles) sicpe geminae , aiitica et postica , raro defi- 

 cientes v. plures — et glamellce (paleas, Kuntli), plerumque 

 geminatim in axi flexuoso alternanles , ni par unicum sit ; 

 glumella interna s. postica sa^pius binervis v. apice bifida, 

 externa 1 - 5 - co - nervis et ssepe arislala; liaic opponuntur 

 sepalidia carnosula, minima, bina (squamulae, lodicula), c. 

 staminibus hypogynis 5 alternanlia; nonniillis stamina 6, ad 

 ovarium verlicillata v. ad 1 anticum v. 2 lateralia reducta, 



