64 
Perennails. Flowers not very small. 
Flowers very large. A. succumbens. 
Flowers medium-sized. Northern plants. 
(A. nitidus.) 27. Hamosi. 
Flowers very small, mostly Mexican. 
29. Micranthi. 
Annuals. 28. Leptocarpi. 
Pods didymous to reniform, cross-ribbed small. 
Perennials. 
Flowers and fruit in dense heads. 
12. Hypoglottides. 
Flowers and fruit in spikes, 
13. Chaetodontes, 
Annuals. 30. Didymocarpi. 
