430 SKETCH OF PALEOBOTANY. 



Dicotyledons, without Intimating that they differ in any essential re- 

 spect from oaks or elms. 

 The following is their system in outline: 



Class I.— VASCULAEES, or PLOWEEING PLANTS. 



Subclass 1. ExoGEN^, or Dicotyledons. 



Nymphseacese. 



Laurinese. 



LegumiuosaB. 



Ulmacese. 



Oupuliferae. 



Betulineae. 



SalicinesB. 



Myriceae. 



Juglandese. 



Euphorbiacese. 



Aceiineas. 



OonifersB. 



Cycadese. 



Doubtful. 



Subclass 2. Endogen^, or Monocotyledons. 



Marantacese. 

 Asphodelese. 

 SmilacesB. 

 Palmse. 

 Pluviales. 

 Doubtful. 



Flowering plants which cannot be with certainty referred to either 

 the monocotyk'donous or the dicotyledonous classes. 



Class II.— CBLLULAEES, or FLOWEELESS PLANTS. 



Bquisetacese. 



Pilices. 



Lycopodiacese. 



Musci. 



Oharacese. 



Algae. 



Plants the affinity of which is altogether uncertain. 



Stigmaria is put in tbe Euphorbiacete, Sphenophyllum in the Coniferse, 

 Annularia and AsterophylUtes in the Dicotyledons, Nceggerathia in the 

 Palmae, while Sigillaria and Volkmannia are classed with the last, or 

 wholly uncertain group. 



With the rapid increase of material for the study of fossil plants the 

 possibility of referring them to living families and genera has increased 



