Some Common Adulterants pound in Agricultural Seeds. :)\ 



The Malta Thistle in Clover Seed. 



Plate I, figs. 3 and 4; Plate II, figs. 2 and 3. The seeds of 

 the Malta Thistle {Centaurea melitensis, L.) are oblong in 

 outline, with darker grey longitudinal markings, and often witli a 

 shiny coat. The base terminates in a small hook, and the apex may 

 be tipped with stiff hairs. The seeds are easily recognized in 

 clover, as the short stiff hairs seldom fall away and the seeds of clover 

 are quite devoid of hairs. 



The vSi'EAR Thistle in Clover Seed. 



Plate I, figs. 5 and 6: Plate III, figs. 1 and 3. The seeds of the 

 Spear Tliistle (Cnicus hnrccolafus, L.) are fiattened, oblong in 

 outlipf, shining, light-grey in colour with blackish longitudinal 

 markings, and the apex is tipped with long feathery hairs. As the 

 feathery hairs often become detached from the seed, the large 

 size and tlie presence of the long-itudinal black markings have to be 

 relied upon for distinguisliing these seeds from that of clover. 



Russian Tumble Weed in Clover Seed. 



Plate I, figs. 7 and 8; Plate III, figs. 2 and 8. The seeds of 

 Russian Tumble Weed (SnlsoJn Ixoli) are very small, irregular in 

 shape, somewhat resembling a flattened top, and are reddish-yellow 

 in colour. It can at once be distinguished from clover seed, which 

 are oval or kidney-shaped, by the small projection in the middle of 

 the seed. The seeds of the Salsola are so small that a magnifying 

 glass should be used to detect them. 



The Mexican Poppy in Bras ska Seed. 



Plate I, figs. 9 and 10; Plate lY, figs. 1 and 3. The seed of the 

 Mexican Poppy (Argemone Me.riomia) is spherical, black in colour, 

 with a pitted surface and is crested on one side. 



It resembles the seed of the brassica very much, but can be at 

 once distinguished by the pitted surface. 



The Milk Thistle in Artichoke Seed. 



Plate I, figs. U and 12; Plate IV, figs. 2 and 3. The Milk 

 Thistle (Silyhujn marianuin) has oblong flattened seeds, blunt at 

 the base, shining, and brown in colour, with numerous black 

 markings. At the apex are long fine hairs which often fall away 

 when the seed is dry. They resemble the seed of the artichoke 

 in shape, but ore not so long and are darker in colour. 



N .B. — The seeds were photographed by Dr. E. P. Phillips of this 

 Division, 



