(95) 



3. W. ANGUSTIFOLIA Nutt. P?ippus aristate. 

 Marin County. Spring. 



27, Helianthella Torr. & Gray. 



Frustranea. Head oo -flowered. Receptacle 

 flat; paleaceous. Akenes flattened; pappus 

 represented by 2, marginal, aristae, alternating 

 with 2, caducous paleae. 2. Flowers yellow. 



1. H. CALIFOBNICA Gray. Napa. Spring. 



28. Helianthus L, SUNFLOWER. 



Frustranea. Head co-flowered. Receptacle 

 flat, paleaceous. Akenes slightly compressed; 

 quadrangular. Pappus represented by 2, mar- 

 ginal caducous; palese with minute, intermedi- 

 ate ones. Ray-flowers yellow. 



1. H. ANNUUS L. Receptacle flat; paleaa of 

 receptacle 3-cleft; disc brown; lower leaves 

 cordate, serrate. Common. Summer. 



2. H. SCABERRIMUS Benth. Receptacle flat; 

 paleae of receptacle entire, aristate, the awn 

 as long as the disc-flowers; disc brown. 0. 

 San Rafael. Summer. 



3. H. EXILIS Gray. Receptacle flat; palea3 

 of receptacle entire, aristate, the awn longer 

 than the disc-flowers; disc brown. 0. Lake 

 county. Summer. 



