THE GENERAL CHARACTERS OF SEEDS 



491 



Pig. 366A Pig. 366B Fig. 366C 



Fig. 366. Seeds and achenial hairs of Sneezeweed and Fetid Marigold. A. 



Sneezeweed (Helenium autumnale). B. Fetid Marigold (Dyssodia papposa). 



C. Achenial hairs of Fetid Marigold. 

 (A and B, drawings hy Charlotte M. King; C, from drawing hy Mary A. Nichols.) 



Yarrow (Achillea millefolium L,). 



Achenes one-twelfth to one-tenth in. long, oblong to obovate, 

 somewhat compressed ; light on the margin, the remainder some- 

 what brownish ; sometimes slightly curved, base with prominent scar 

 with slightly raised border ; apex larger with a notch in the center 

 and a projecting knob ; surface of the achene marked with fine 

 lines; pappus absent. 



Fig. 367A 



Fig. 367. Seeds of Yarrow and Mayweed. A, Tarrow (Achillea millefolium) ; a, 

 seeds (achenes) in side view, the two at the left showing the minute, cir- 

 cular scar ; b, group showing the natural size. 

 B. Mayweed (Antliemis cotula) ; a, a group of seeds showing the prevailing 

 forms ; b, a group showing the natural size. 

 (After Hillman, Bull. Nev. Agr. Exp. Sta.) 



Mayweed (Anthemis cotula L.). 



Achenes one-twentieth to one-sixteenth in. long, oblong with 

 prominent tubercled ribs, or occasionally smoothish curved, the base 

 tipped with smooth nipple-like projections; pappus absent; straw- 

 colored to light brown; bearing a projection scar; base with round, 

 light-colored scar. Common in clover and grass seeds. 



