(89 ) 
16. Psilocarphus Nutt. 
Necessaria. Superflua. Head o-flowered. 
¥% flowers few, tubular, 5-dentate. ¢ flowers 
o-seriate, filiform, each wrapped in a palea. 
Scales of the involucre few, scarious. Recep- 
tacle convex, paleaceous externally, naked in 
the center. Akenes enveloped in the palez. 
Pappus 0.—@©. Flowers inconspicuous. 
1. P. Orzaanus Nutt. Covered with loose, 
white wool; akenes cylindrical.—Low ground 
near creeks. Spring. 
2. P. TenELLUS Nutt. Covered with ap- 
pressed grey wool. Akenes fusiform.—Low 
ground near creeks. Spring. 
17. Evax Gertn. 
Necessaria. Superflua. Head o-flowered. 
8% flowers tubular, few—? flowers o-seriate, 
filiform. Scales of the involucre few, 1-2- 
seriate, scarious. Receptacle elongate (like 
the axis of a spike), paleaceous externally, 
naked in the center with the é flowers. Pap- 
pus 0.—©. Flowers inconspicuous. 
1. E. cavtescens Gray. — Woolly annual. 
Gravelly alluvium. San Rafael. Spring. 
18, Filago L. 
Superflua. Head o-flowered.. % flowers 
tubular, 4-dentate. @ flowers -seriate, 
filiform; external rows hidden between 
