■3 



CRYPTOGAMIA. 



736. HYMENOPHYLLUM. Sorus marginalis, recepta- 

 culo cylindraceo insertus. Indusiuvi bivalve, sorum 

 includens. 



V. HYDROPTERIDES. 



737. ISOETES, Capsula membranacea, non dehiscens, 



frondis basi immersa, 1-locularis, 5ct/?j«q angulata, 

 receptaculis pluribus filiformibus inserta. 



738. SALVINIA. Indusia imbricata, connata, capsulam 



unilocularem mentientia. Semina receplaculo cen- 

 tral! inserta. 



739. AZOLLA. Capsula unilocularis, radicalis, globosa, 



polysperma. 



^* 



I. GO NOPTE RIDES, 



65 i 



713. EQUISETUM. Gert. p/. 1614. 



1. E, caulibus sterilibus simpliciter ramosis^ ramis scabrius- arvense, 



culis tetragonis, fructificationibus simplicibus, vaginis 



cylindraceis inciso-dentatis, deniibus acutis. Willd. 



enum. 1065. IFilld. sp.pl. 5. p. 1. 

 Icon. SchkuhrJiUc. t. 167. 

 In low and sandy fields : Pensylvania and Virginia. 1/ . 



April, May. v. v. 



2. E. caulibus sterilibus fructificantibusqueduplicato-ramo- sylvaficum^ 



sis, ramis scabriusculis deflexis tetragonis, ramulis 



subtriquetris, If^illd. enum. 1005, ^P'illd. sp. pi. 5. 



p. 3. 

 Icon. SchkuhrJiUc. t. 166. Fl. dan. \\82. 

 In low shady woods : New York to Virginia. 1/ . April 



— June. V. V, 



3. E. caulibus subramosis, ramis subquaternis tetragonis 



glabris, spica cylindracea terminali, — Willd. sp. pi. 5. 

 p. 4. 

 In swamps : New York to Virginia. If. , May. v. v. 

 Resembles E. limosum. 



4. E. caulibus simpliciter ramosis glabris sulcatis, ram'S 



pentagonis apice spjciferis. iVUld. enum. 10t3.'>. 

 IF Hid. sp. pi. 5. p. 5. 



uUsinosum. 



palustre. 



