MANUAL OF GENERAL AGRICULTURE. 59 



Drawings of Seeds. Make drawing from convex side. 

 Make drawing of cross section. 



Question : Give an illustration of a sod forming grass 

 and a bunch forming grass. Discuss the advantage of 

 each. 



55. IDENTIFICATION OF CLOVER AND GRASS 

 SEEDS. 



Materials: Lens. See Exercise 53. 



There is no work which requires more careful atten- 

 tion or is more valuable than the identification of grass 

 and clover seeds, and separating them from their adul- 

 terants. 



For examining the seeds a small lens is very use- 

 ful. Use the following artificial key, which is not in- 

 tended to describe the seed but simply calls attention to 

 the most prominent characteristics of each variety. It 

 is much better to first learn to identify by use of the 

 key than by use of the drawings. 



(a) Key for Identification of Clover Seeds 



Seed free (not inclosed in pod) 

 Seed bean-shaped 



Color, pinkish, % in. long Crimson Clover 



Color, mostly yellow; large seeds are kidney shaped Alfalfa 



(Turkestan alfalfa is same, but slate colored.) 



Seeds larger and more regular than in alfalfa Burr Clover 



Color, dark yellow to brown Yellow Trefoil 



Seed oval-oblong 



Color, yellow; seed notched near one end Bokhara Clover 



Seed heart-shaped 



Color, yellow to brown White Clover 



Color, dark green to black Alsike Clover 



Seed somewhat triangular 



Color, yellow to brownish Red Clover 



Seed inclosed in pod 



Pod large and corrugated, ^4 i n - l n g 



Color, brown; seed, bean-shaped Sainfoin 



Pod whitish, % in. long 



Color, yellow; seed oval, notched near end 



Yellow Sweet Clover 

 Pod brown, i/ 8 in. long 



Color, dark brown, seed mottled Japan Clover 



