(70) 
8. Hemizonia.—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. é 
b. Anthers almost distinct. 
i. 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. 
GYNANDRIA. 
I. Monandria. 
a. .Labellum calcarate. 
1. Habenaria. 
b. Labellum not calcarate. 
1. Epipactis.—Labellum geniculate. 
