Zanichellia. poxAMEiE 15- 



cantibus, foliis angustissime linearibus vel filiformibus, slipuh"s intra 

 foliaceis, carpellis;2-6 in umbellulam breviler pedunculafam congestis 

 compressis oblique oblongis vel sffipius semilunalis Irevibus vel mar- 

 gine dorsali convexo vel rarius etiam ventrali concavo crenato- 

 dentatis 'ifi . Ic. Nees Germ. - Z. dentata Willd. (forma carpellis 

 dentatis). — Planta quoad floris masculi longiludincm, carpella plus 

 minus longe pedicellata, plus minus longe stylata, margine integra 

 vel dentata formas pluresa nonnullis pro speciebus habitas sed qua? 

 intermediisconfluunt prffibens. 



x genuina Aschers. Fl. Brand., p. 668. — Floris masculi pedun- 

 culus elongatus, fructus breviter pedicellati subdcntati vel den- 

 tati stylo2-3 plo longiorcs. stigma denticulatum. — Micheli Nov. Gen. 

 tab. 34 fig. I. — Z. macrostemon J. Gay Z. repens et Z. major 

 Boenningh. Rchb. Germ., tab. XV[, fig. 20 et 24. — Z. polycarpa 

 Nolte fig. 23. 



/3 pedicellata Aschers. loc. cit p, 669. — Floris masculi pedunculus 

 abbrevialus, pedicelli carpello ?equilongi vcl vix breviores, stylus 

 carpellura sajpc ffiquans, stigma obscure denliculatum "^. \c. Mich. 

 tab. 34. fig. 2. — Z. dentata Willd. — Z. braclujstemon Gay. — Z. 

 pedunciitata Rchb. — Z. gibberosa Rchb. Ic. Germ. 21 et 22. 



Hab. omnes formte altera in altei-am transeuntes in aquis totius ditionis a 

 Grsecia (Heldr!) et Macedonia (Friv !), ad Egyptum et ejus Oases (Eiirenb • 

 Schweinfl Asch!), Persiarn ! regionem Caucasicam ! rognum Cabulicuni 

 (GrifT!). 



Ar. Geogr. Totus orbis (pra^ter Australiam). 



POTAMOGETON (L. Gen. 174). 



Florcs hermaphroditi spicati Perigoniuni herbaceum tetraphyllum 

 phyllis brevissime iinguiculalis PPstivalione valvatis. Antherje qua- 

 tuor subsessiles phyllis anteposilie dilhecece thecis conneclivo plus 

 minus sejnnclis. Carpella (|UHluor erecta uiiiovulala slyli> brevis- 

 simo vcl nullo, stigmate peltato. Ovulum sufune ventrali inlVa apicem 

 affixum pendulum campylotropum. NucuUe (juatuor vcl aborlu 1-2 

 suhdrupacece sessiles monospcrmfC,endocarpioduro,albumen nullum, 

 Embryo uncinalus, — Herbie aquaticie. 



§ I. Heterophylli Koch. — Folia inferiora submersa alterna 

 floralia natanlia subopposita dissimiiia, stipuke libcrte. 



1. P. natans (L. Sp. 182) caule longo subsitiiplici, Ibliis omni- 

 bus longepetiolalis, submersis oblongis, vel lanccolalissub anthesiob 

 laminam pulrcdine destruclam ad petiolum reductis, nalaiitibus co- 

 riaceis nervosis ovatis vel ovato-oblongis basi leviter cordatis cl ad 

 limbi ortum biplicatis, petiolissemiferetibus supra planis, pcdunculis 



