(70) 



3. Heraizonia. Involucre 1 - seriate, each 

 scale with its base half embracing a ray 

 akene. Pappus of ray akene 0. 



4. Madia. Involucre 1-seriate, each scale 

 completely enwrapping a laterally com- 

 pressed ray akene. Pappus 0. 



b. Anthers almost distinct. 

 1. Iva. 



c. Anthers calcarate. 



1. Evax. Scales of involucre 1 2-seriate. 

 Pappus 0. 



2. Stylocline. Scales of involucre very few. 

 Flowers of the ray bracteate by a cari- 

 nate palea, but not enwrapped by it. 

 Pappus a few caducous bristles. 



3. Psilocarphus. Scales of the involucre 

 few. Each ray flower enwrapped in a 

 palea. Pappus 0. 



V, Monogamia. 

 1. Downingia. 



QYNANDKIA, 

 I, Monandria, 



a. Labellum calcarate. 

 1. Habenaria. 



b. Labellum not calcarate. 



1. Epipactis. Labellum geniculate. 



