476 



WEED FLORA OF l6WA 



:/ cv 



Figure 345A 



^^r j^r 



*«*« . » 



• ^ 



Mgure 345B. 



Fig. 345. A. doirimon' Plantain iPlantdgo inaiov'). a, a^ group of seeds, en- 

 larged, showiilg the relative form -arid size, " also the Surface ridges as dark 

 lines ; b, a group showing the natural size ; c, a cross section of a seed. 

 B. Plantago rugeUi. A, seeds, the upper two showing the scar. B, seed show- 

 : Injg t5i§ mucilage. ,; C, a seed-vessel. :D, seeds, natural size; ::■) 



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



RUBIACEAE, MADDER FAMILY. 



Cleavers {Galium aparine L.). 



Fruit iridehiscent, spherical, bne-tenth to one-eighth in. in diam- 

 eter, roughened with prickles, tuberculate when prickles are rubbed 

 off ; color blackish ;' embryo Curved ; endosperm horny ; fruit covered 

 with hooked trichomes. 



Fig. 346. Cleavers, or Bedstraw (Oalium aparine). 

 (After Wlnton.) 



