388 ASTERACEAE. 



ous pedicellate small few-flowered heads. Ray-flowers 

 fertile, 4-8, minute. Disk-flowers 1-4. Bracts of the 

 receptacle united and forming a cup which encloses the 

 disk-flowers, receptacle otherwise naked. Achenes slen- 

 der, compressed or obcompressed. Pappus none. 



1. H. exiguus Gray. Slender, 8-15 cm. high, hirsute, glandular 

 above, paniculately branched; the small heads on long filiform naked 

 peduncles; leaves linear, alternate; involucral bracts 5-8, lunate, 

 almost destitute of free tips, hispid-glandular; cup of receptacle 

 prismatic and very narrow, enclosing a single straight obliquely 

 obovate laterally compressed achene; ray-achenes obovate-lunate, 

 pointed by a small disk. 



Frequent on wooded hillsides in open places. May-August. 



2. H. minimus (Gray) Greene. Stems branching, only about 

 2.5 cm. high; leaves mostly opposite, the lowest oval or oblong, the 

 others linear, about 6 mm. long; achenes of the ray broadly obcom- 

 pressed, rounded at the summit, beakless. {Hemizonia minima 

 Gray.) 



Wilson's Peak, Davidson. 



42. LAGOPHYLLA Nutt. 



Slender, villous or hirsute, rigid and brittle, panicu- 

 lately branched annuals, with mostly alternate com- 

 monly entire leaves, and many small heads of pale 

 salmon-colored or yellow vespertine flowers, subtended 

 by foliaceous bracts. Bracts of the involucre 5, thin, 

 herbaceous, flat on the back, completely enclosing its 

 obcompressed achene and deciduous with it. Rays 

 cuneate, palmately 3-cleft, their achenes obovate-oblong, 

 smooth, nearly straight, pointless. Receptacle flat; 

 chaff a single row of distinct bracts surrounding about 

 5 perfect but sterile disk-flowers. Pappus none. 



1. L. ramosissima Nutt. Canescent with a loose silky pubes- 

 cence, 2-8 dm. high, diffusely paniculate; lowest leaves spatulate- 

 obovate, stem-leaves lanceolate to linear, all entire; heads 6 mm. 

 high, 12 mm. broad, including the expanded rays; achenes 3 mm. 

 long. 



Frequent in open places in the foothills and in the chaparral belt 

 of the mountains. May-September. 



43. LAYIA Hook & Arn. 



Vernal annuals with alternate leaves or the lowest 

 opposite, and usually showy heads of white or yellow 

 flowers terminating the branches. Bracts of the invo- 

 lucre flattened on the back, more or less completely 



