(89) 



16, Psilocarphus Nutt. 



Necessaria. Superflua. Head oo-flowered. 

 flowers few, tubular, 5-dentate. 9 flowers 

 oo-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 palea). 

 Pappus 0. 0. Flowers inconspicuous. 



1. P. OREGANUS 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 Gaertn. 



Necessaria. Superflua. Head oo-flowered. 

 flowers tubular, few 9 flowers co-seriate, 

 filiform. Scales of the involucre few, 1-2- 

 seriate, scarious. Eeceptacle elongate (like 

 the axis of a spike), paleaceous externally, 

 naked in the center with the $ flowers. Pap- 

 pus 0. 0. Flowers inconspicuous. 



1. E. CAULESCENS Gray. Woolly annual. 

 Gravelly alluvium. San Rafael. Spring. 



18, Filago L- 



Superflua. Head oo-flowered. flowers 

 tubular, 4-dentate. ? flowers co-seriate, 

 filiform; external rows hidden between 



