SPRING FLORA OF MANHATTAN. 36 



D. papposn, (Vent.) Hitchc. A low annual with pinnately parted 

 leaves and small heads with few, short and inconspicuous rays. Sterile 

 ground, common late in tlie season. 



ACHILLEA, L. 

 Bracts imbricated, margins scarious. Pappus none. 

 A. millefolium, L. Leaves alternate, 2-pin nately parted into narrow 

 divisions. Perennial. Prairie, common. 



CHRYSANTHEMUM, L. 

 Bracts imbricated. Receptacle broad and flat. Pappus none. 

 C Leucanthemum, h. Stem erect, naked above. Fields, not common. 



SENECIO, L. 

 Bracts equal, in one row. Pappus of capillary bristles. 

 S. BalsamitcB, Muhl. Erect, woolly. Leaves pinnatifid. Heads 

 several, corymbose. Open ground, common. 



