398 ASTERACEAE. 



branous, subtending the disk-flowers. Ray-flowers white 

 or pink, pistillate. Disk-flowers perfect, fertile, yellow. 

 Achenes oblong or obovate, slightly compressed. Pappus 

 none. 



1. A. lanulosa Nutt. Pubescent or nearly glabrous, simple or 

 corymbosely branched above, 3-6 dm. high; basal leaves and those 

 of the sterile shoots petioled, those of the stem sessile, all narrowly 

 oblong or lanceolate in outline, finely dissected into narrow pinnatifid 

 segments; heads numerous, 4-6 mm, broad, in terminal compound 

 dense corymbs; rays 4-6, white. 



Rather common in the pine belt of the San Gabriel and San 

 Bernardino Mountains. 



59. MATRICARIA L. 



Annual or perennial herbs with alternate leaves dis- 

 sected into filiform or narrowly linear segments, and 

 discoid or radiate peduncled heads. Involucre hemi- 

 spheric, its bracts imbricated in few series. Receptacle 

 conic or elongated, naked. Rays in ours wanting. 

 Disk-flowers yellow, perfect, fertile, 4-5-toothed. 

 Achenes 3-5-ribbed. Pappus a coroniform border or 

 none. 



1. M. matricariodes (Less.) Porter. Annual, glabrous; stems 

 leafy, becoming much branched, often more or less decumbent, 

 1-3 dm. high; leaves 2-3-pinnately dissected into linear acute lobes; 

 heads numerous, 6-8 mm. broad; involucral bracts oval or oblong, 

 green with broad white scarious margins, much shorter than the 

 ovoid disk; achenes oblong, faintly nerved; pappus an obscure 

 crown. {M. disco idea DC) 



Frequent along roadsides and in waste places. May-July, 



60. COTULA L. 



Low annual or perennial herbs with alternate lobed or 

 dissected leaves, and slender peduncled discoid short- 

 hemispheric heads. Involucral bracts in about 2 series, 

 greenish. Receptacle naked, flat or nearly so. Mar- 

 ginal flowers pistillate and apetalous. Disk-flowers 4- 

 toothed, fertile or sterile. Achenes pedicellate, com- 

 pressed, spongy-margined or narrowly winged. Pappus 

 none. 



1. C. coronopifolia L. Perennial, usually subaquatic, somewhat 

 succulent and glabrous; stems clustered, stoutish, decumbent, 

 25-30 cm, long; leaves linear-lanceolate, laciniate-pinnatifid or the 

 upper entire, clasping or sheathing at the base; heads much de- 

 pressed, 8-12 mm. broad; apetalous flowers in 1 row, their achenes 

 with a thick spongy wing; disk-flowers yellow, their achenes with 

 wing reduced. 



