(89) 



16. Psilocarphus Nutt. 



Necessaria. Superflua. Head co-flowered. 

 ^ flowers few, tubular, 5-dentate. ? flowers 

 oo-seriate, filiform, each a rapped in a palea. 

 Scales of the involucre few, scarious. Eecep- 

 tacle convex, paleaceous externally, naked in 

 the center. Akenes enveloped in the palcce. 

 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 Gffirtn. 



Necessaria. Superflua. Head co-flowered. 

 ^ flowers tubular, few — ? flowers oo-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 $ flowers. Pap- 

 pus 0. — . Flowers inconspicuous. 



1. E. CAULESCENS Gray. — Woolly annual. 

 Gravelly alluvium. San Eafael. Spring. 



18. FilagoL. 

 Superflua. Head co-flowered. ^ flowers 

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

 filiform; external rows hidden between 



