Seeds called "beans" are often included among the crops called "pulses" (legumes), although a narrower prescribed sense of "pulses" reserves the word for leguminous crops harvested for their dry grain. The term bean usually excludes legumes with tiny seeds and which are used exclusively for forage, hay, and silage purposes (such as clover and alfalfa). According to the United Nations Food and Agriculture Organization the term "BEANS, DRY" (item code 176) should include only species of Phaseolus; however, enforcing that prescription has proven difficult for several reasons. One is that in the past, several species, including Vigna angularis (adzuki bean), mungo (black gram), radiata (green gram), and aconitifolia (moth bean), were classified as Phaseolus and later reclassified. Another is that it is not surprising that the prescription on limiting the use of the word, because it tries to replace the word's older senses with a newer one, has never been consistently followed in general usage.
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