IIVIIM I 



\ \1 \|. \. I . 1. 





Order XL. NAIADACEjE.— Nai 



Naiad 



i 



i. Wu. M 

 . I 282. i 



I 



■ - 



Water-plants, inhabiting both the ocean and fresh water. I 



■ I reins, and membranous interpetiolar Btipules. flowers iucoiw 

 arranged in terminal B] 



nth "I 2 or i pieees, often 

 ciduous, rarely wanting Stami 

 definite, hypogynous Ovaries I <>r 

 more superior ; stigma simple; 

 ovule solitary, pendulous and <iit1 1<»- 

 or campylotropal, or erect and 

 anatropaL Fruit dry, very rarely 

 opening by regular valves, l-cel 



era or pendulous ; 

 albumen none : embryo with a 

 greatly enlarged radicle, and a hv- 



cleft for the emissi f 1 1 1 * - 



plumi 



In this < hrder we hi ve the i 

 approach t" ii class of Thal- 



i is. Man) i f them live under 

 water. The perianth i I to 



a few i:n 



is in - i either a t'>- 



tal al Bpiral v< ssels, or that 



form <>!' tissue exists ina very rudi- 

 mentary Btate Pollini assel ts, 

 cording to De Candolle, that Bpiral 

 . exist in them ; but Ami- 

 ci, on the other hand, maintains 

 that there is no trace of them, at 



in Caulinia. The man 

 finity of Naiads t'> Arrow 

 determines a relation on the part 

 of the former to Arads, which is 

 confirmed by the tendency to | 

 duce a rudimentary Bpathe in some 

 of them, and by their undoubted re- 

 semblance to the D It is 

 remarkable that Adanson was aware 

 of this relationship between Arads and Naiads, to wh Ii, 

 N a ere a very heterogeneous assemblage, >li'l not ass nt 

 as now circumscribed, are generally translucent cellular , 

 having no epidermoidal layer, and perishing rapidly upon •- 

 Been the sap circulate in the transparent joints ol Caulii ■ 

 the unknown plant upon which Corn' ma 

 See Amici in Ann. da Se. > 42. Mr. Griffith has i 

 ence between the development of thi 

 genera] sufficiently apparent, an exception h 

 in v Inch the future pistil seems t.> be di i a an am 

 body, which subsequently becomes the ovule ! 



Pig \i iv. Zannlchellia palustris. I. I 

 ibit the ovule ; -t. :i v. rtical ■• cUon o 



S. an o\ »r; 



