126 Illinois State Laboratory of Xaftrml History. 



Tribe VIII. TRICHOLE^:. 



Inner involucre rough. Tricliolea. 

 Inner involucre smooth. Gymnoscyplut*. 



Tribe IX. SACCOGYNE^E. 



Capsule spirally twisted B 



Capsule regularly valved C 



Mouth of inner involucre fissured. Calypogeia. 

 B 



Mouth of inner involucre irregular. Cincinnultin. 



I Inner involucre terminal, laterally pedunculate. Gym- 

 C J nanthe. 



^ Inner involucre lateral, sessile D 



( Inner involucre not barbed at its insertion. Saccoytjmt. 

 I Inner involucre barbed at its insertion. Geocalyx. 



Tribe X. ACOLE^:. 



( Calyptra exserted. Mniopsis. 

 A < 



| Calyptra included in the involucre B 



\ Leaves of involucre free. Acolea. 

 I Leaves of involucre connate. 



Tribe XI. MESOPHYLLE.^. 



\ Involucre imbricate. Mesophylla. 



} Involucre in a circle B 



\ Inner involucre exserted. Southbya. 

 B < 



| Inner involucre included C 



Leaves of involucre opposite. Alicularia. 

 Leaves of involucre whorled. Marsupella. 



