FAMILIES OF FLOWEEING PLANTS 



139 



perfumers in the manufacture of sachet powders and other perfumes. 

 The odor is due to a principle known as coumarin. 



Tribe Viceae. From the economic standpoint this and the follow- 

 ing are the most important groups of the Papilionaceae. The genus 

 Pimm comprises all forms and varieties of the cultivated pea, while the 



Fig. 122. Hairy vetch, Vicia villosa, showing also enlarged flower, column of stamens and pod. 

 After TraC3^ Bull. No. 15, Div. of Agrost. U. S. Dep. Agric. 



fragrant sweet pea belongs to the genus Lathyrus, of which there are 

 many wild species. Vicla, a closely related genus, includes the wild 

 vetches and tares, so troublesome in grain fields, but it also contains 

 the hairy vetch ( V. villosa), an important forage plant of the southern 

 States (see Fig. 122). The European genus Lens furnishes the lentil, 

 while Cicer is the gram or chick pea. 



