most or "free end" of this ridge, which is called the "nose," "beak," or "free end of the radi- 

 cle." The part from which the groove separates the ridge is broader in proportion to its 

 length than is the ridge. White sweet clover very clearly shows both the "notch" and the 

 "groove" as well as the "scar" and "nose." 



(a) In which four is the groove rather well denned, largely through its considerable 

 breadth, depth and length? 



(b) In which three is the groove narrow, but, largely through color and skin texture, 

 well defined? 



(c) In which one is it often rather broad, but not well denned? 



(d) In which one is it least prominent? 



5. Shape. Shape is one of the most satisfactory means that we have of identifying legume 

 seeds. 



(a) Of the seeds which you have for examination, which two are rather uniformly heart- 

 shaped? 



(b) Which one is in general "somewhat triangular" (though the corners of the triangle 

 are rounded instead of sharp), or as others describe it, "shaped like a boxing glove or catch- 

 ing mitt"? 



(c) Which two are rather uniformly notched near one corner? One .of these two kinds 

 of seed is usually much more notched at the corner than is the other one. 



(d) Which one is very uniformly oval or egg-shaped, and looks something like a plump 

 navy bean? 



(e) Which one is uniformly shaped something like the preceding one, excepting for a 

 small but prominent "nose," not far from the smaller end of the seed? 



(f) Which one is uniformly kidney shaped, or shaped much like a lima bean? 



(g) Which one is decidedly lacking in uniformity and has at least three diherent shapes? 



6. Size, (a) Which two or normally rather large? 

 (b) Which five are normally intermediate? 



(c) Which two are normally very small? 



7. Skin Texture, (a) Which one is very smooth and shining? 



(b) Which six are rather intermediate in smoothness and gloss? 



(c) Which one is rather dull and mottled? 



(d) Which one has a finely uneven and very dull skin? 



8. Color. At best, color alone is an unsatisfactory point of distinction. It is, however, 

 a distinction which impresses the eye strongly, and if coupled with more fundamental differ- 

 ences, shape for instance, is often of material value in seed identification. 



(a) Which one is rather uniform, and ranges from a light, yellowish brown to a golden 

 or reddish brown? 



(b) Which one is but slightly uniform, and ranges from a canary yellow to a yellowish 

 brown? 



(c) ' Which one is but slightly uniform, and ranges from greenish yellow to greenish 

 purple or greenish black? 



(d) Which one has little uniformity, and ranges from lemon yellow to a deep violet? 



(e) Which one is but slightly uniform, and is a dark olive green with a few green and 

 a few brownish seeds? Some of these seeds are partly covered with a rough whitish hull. 



(f) Which one is fairly uniform and ranges from a neutral yellow to a brownish yellow? 



9. Odor. Which two have a peculiar sweetish odor? 



10. Drawings. Make a careful drawing of what seems to be a typical specimen of the 

 seed of each legume, broad view. Make the dimensions of your drawings ten times that of 

 your specimen. The seed of one very important legume has more than one typical shape. 

 In this case make as many drawings as are necessary to illustrate these different types. Draw 

 these seeds in the same order as given in the list of supplies. 



108 



