120 Illhio/s State Ldlioratonj of Xatiinil H/storif. 



Tribe VIII. Trichole.^. 



Inner involucre rough. TrirlioJea. 

 Inner involucre smooth. (hj}iinoseijphi(s. 



Tribe IX. Sacc'OGyne.*;. 



Cfii)8ule spirally twisted B 



Capsule regularly valved C 



Mouth of inner involucre fissured. Cah/pogeia. 

 Mouth of inner involucre irregular. Ciiicifuinhts. 



Inner involucre terminal, laterally pedunculate. Gi/di- 



itauthe. 

 Inner involucre lateral, sessile D 



Inner involucre not barbed at its insertion. Saccogyna. 

 Inner involucre barbed at its insertion. Geocalyx. 



Tribe X. Acole^. 



Calyptra exserted. Mtilopsis. 



Calyptra included in the involucre B 



Leaves of involucre free. AcoJea. 

 Leaves of involucre connate. Schisiiia. 



Tribe XI. Mesophylle.e. 



Involucre imbricate. MesoplnjJla. 



Involucre in a circle B 



Inner involucre exserted. Southbtja. 



Inner involucre included C 



Leaves of involucre opposite. AlicuJaria. 

 Leaves of involucre whorled. 3IarsupeIIa. 



