SYSTEMATIC ARRANGEMENT. 229 



Monopetalous Exogens. 



c. The Nio-htsliade Tribe (Solanaceae), Plate XV. 2. 



d. The Gentian Tribe (Gentianaceaj), Plate XIII. 1. 

 The Wormseed Tribe (Spigeliacess). . 



The Apoc}Tium Tribe (Apocynacese), 



The Asclepias Tribe (AsclepiadacesD), Plate XLV. 2. 



e. The Olive Tribe (Oleacea?), Plate XIII. 2. 



The Jasmine Tribe (Jasminacese), Plate XLV. 1. 



Subclass III. Incomplete Plants. 



The groups are five ; namely — 



1. Rectembryous ; calyx imperfect; embryo straight. 



2. Achlamydeous ; calyx entirely wanting. 



3. Tubifcrous ; calyx tubidar, often resembling a 



corolla ; embryo straight ; ovary usually one- 

 celled. 



4. Columnous ; calyx perfect ; ovary 3-6-ceUed ; em- 



bryo straight. 



5. Curvembryous ; calyx perfect ; embryo amoved like 



a horse-shoe. 



The common natural orders belonging to these 

 groups are as follows : — 



Group 1. Rectembryous. 



a. The Oak Tribe (Corylacea3 or Cupulifcra)), Plate 



X. 2. 

 The Birch Tribe (Betulaceai). 

 The Garry a Tribe (Garryacea)). 



b. The Nettle Tribe (Urticacea^), Plate XL 1. 



