THE GENERAL, CHARACTERS OF SEEDS 



491 



Fig.SeeA Fig. 366B Kg. 8660 



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



Sneezeweed (.Belenmm dutizmnale) . B. Fetid Marigold (.DyssocUa papposa). 



C. Achenial hairs of Fetid Marigold. 

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



Yarrow {Achillea mMefolwrn L,). 



Aehenes one-twelfth to one-tenth in. long, ohlong to obovate, 

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

 what brownish ; sometimes slightly curved, base with prominent sear 

 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. 





B A 



Fig. 367A Fig. 367B 



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

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

 cular scar ; b, group showing the natural size. ' ■' 

 B. Mayweed (.Antheinis cotuhi) ; .i, a t;roup of pe^rlj: slicving the prevailing 

 lorms ; b, a grouii showing the nitural bize. 

 (After Hillman, Eul]. Nev. Agr. Exp. Sta.) 



Mayweed {Antliemis cotula L.). 



Aehenes one-twentieth to one-sixteenth in. long', rblnnj: \\\'A\ 

 prominent tubercled ribs, or occasionally siroothish curved, tl:i' lia^c 

 tipped with smooth nipple-like projections; pappus nbsrnt ; slr;iw- 

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

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



