426 SYSTEMATIC BOTANY, OR 



These primary divisions were again divided into Sub-classes, 

 Cohorts, and Nixus or groups of nearly allied Natural Orders. 

 In 1838, Lindley modified his views so far as regarded Exo- 

 gens, and proposed the following divisions for that class of 

 plants: — 



ExoGENS, OR Dicotyledons. 



Albumen extremely abundant ; embryo 



minute 1. Albuminosse. 



Albumen absent, or in small quantity. 

 Sexes in the same flower. 



Ovary inferior 2. Epigynosae. 



Ovary superior. 

 Flowers, if monopetalous, not with 



a dicarpous ovary . . .3. Polycarposse. 

 Flowers monopetalous, Avitli a di- 

 carpous ovary ... 4. Dicarposae. 

 Sexes in different flowers . . .5. DichnosjK, 



In the year 1839, Lindley proposed to increase the number 

 of the primary classes of plants to eight, in the following 

 manner : — 



State 1. Sexual, or Flowering Plants. 



, ^ , {Class 1. Exogens. 



Division 1. Exogens . ^^^^ogens. \qy^^^^^ Gymnogens. 



i Class 3. Homogens. 



, Spermogens. \ Class 4. Dictyogens. 

 ^. . . ^ ^ ^ Class 5. Endogens 



Division 2. Endogens j ^^^^^ ^ Sporogens, or 



V llhizanths. 



State 2. EsExuAL, or Flowerless Plants. 



Class 7. Cormogens 

 (distinct 

 stem). 



Class 8. Thallogens 



(no distinct 

 stem). 



Lindley finally, in the year 1845, modified his views again, 

 and proi)Oscd the following scheme, which is that adopted by 

 him in " The Veffetable lungdom." 



LINDLEY'S NATURAL SYSTEM, 1846. 

 1. Asexual, or Flowerless Plants. 

 Stem and leaves undistinguisliablc . Class 1. Tliallogens. 

 Stem and leaves distinguishable . Class 2. Acrogcns. 



Division 3. Acrogens 



