THE GENERAL, CHARACTERS OF SEEDS 



501 



Fig. 380B 



Pig. 380. Lettuce Seeds. A. Lactuoa scariola; A, side view of an achene, en- 

 larged. B, a group of the same, natural size. C, an achene bearing Its 

 beak and fragile pappus. 



B. Prickly Lettuce (.Laotuca scariola var. integrata.) 



(A, after Hillman, Bull. Nev. Agr. Exp. Sta. ; B, drawing by L. R. Collins.) 



toward the beak, somewhat flattened, on one side margined, faces 

 convex, with 5-7 longitudinal nerves; scar circular, with a small 

 depression. 



Rattlesnake Root {Prenanthes alia L.). 



Achene oblong or columnar, truncate, somejvhat flattened, 4-5 

 angled, brownish; upper part with a projecting ring to which the 

 bristles of pappus are attached ; scar at the base whitish, not prom- 

 inent; one-eighth in. in length; pappus tawny. 



Fig. 381A Fig. 381B 



Fig. 381. Seeds of Rattlesnake Weed and False Calais. A. Rattlesnake Weed 



(.Prenanthes alba). B. False Calais (Agoseris cuspidata). 



(Drawings by Charlotte M. King.) 



