466 WEED FLORA OF IOWA 



BORAGINACEAB, BORAGE FAMILY. 



Coniinon Hound's Tongue {Cynaglossum offk-maie L,.). 



Ovary dividing into 4 achenes, each 5-7 mm. in length., ovate to 

 round, flattened; lower side bearing large ovate sear; surface cov- 

 ered with straight, stiff, barbed prickles. 



Fig. 330. Common Hound's Tongue iCynoglossum officinale'), a, b, views of 



different faces of seed ; e, natural size. 



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



Wild Comfrey {Gynoglosswm boreale Femald.). 



Nutlets convex on the upper face, somewhat triangular, one- 

 seventh in. in diameter, bearing short barbed prictles on convex 

 surface; color brown. 



Fia. 331. Wild Comfrey (.Cynogloasum boreaie). 

 (Drawing by Ada Hayden.) 



Stickseed (Lappula echinata Gilibert). 



Ovary separating into 4 achenes, 2.5 mm. long, slightly flattened 

 from ovate, under surface tubereulate, bearing straight ridge from 

 point to middle ; on the upper side, the margins bear a double row 

 of slender barbed prickles. 



Beggar's Lice {Lappula virginiana (L.) Greene). 



Achenes 3 mm. long, borne in clusters of 4, broadly ovate, flat- 

 tened on outer side; the outer surface bearing short stiff barbed 

 prickles, the inner side cone shaped, free from hairs, and bearing 

 a trmngular scar. 



