108 GENERA IN CLASS XX. GYNANDRIA. 



Order 9. Polyandria, comprehending such plants as hare 

 many stamina. This order contains eight genera, viz. Grewia... 

 Xylopia... Arum... Dracontium... Calla... Pothos...Amb1iosi- 

 NiA...and Zostera. 



Or, in another view of the Sexual System, as improved by 

 Wildenow, this class contains four orders, which embrace thir- 

 ty-three genera. 



Order 1. Monandria, comprehends such plants of this class 

 is have only one stamen, which contains twenty-six genera, which 

 branch out into two divisions : 1 . Orchideje, with spurs, con- 

 taining six genera; Orchis... Habenaria... Bonatea...Limodo- 

 BUM...DiSA...and Satyrium. 2. Orchide;e, without spurs, con- 

 taining tiventy genera ; Pterygodium... Disperis ... Corycium... 



OPHRYS...SERAPIAS (Ae//e6orme).,.NEOTTIA...CRANICHIS...THELY- 



mitra...Diuris...Arethusa...Epipactis...Malaxis...Cymbidium 

 .. ,Oncidium...Epidendrum... Vanilla. ..Aerides...Dendrobium 

 ...SxELis...and Lepanthes. 



Order 2. Diandria, comprehends plants with two stamina, in- 

 cluding four orders ; Cypripedium (ladies* slipper).,. Sty lidium... 

 Torstera . . . and Gunnera. 



Order 3. Triandria, comprehends plants with three stamens, 

 including two genera ; SALACiA...and Rhopium. 



Order 4. Hexandria, comprehends plants having six stamens^ 

 and has only one genus, Aristolochia ibirthwort). 



