The name is also used to describe other edible seeds from the Fabaceae like the pigeon pea ( Cajanus cajan ) , the cowpea ( Vigna unguiculata ) and the seeds from several species of Lathyrus . The name is also used to describe other edible seeds from the Fabaceae such as the pigeon pea ( Cajanus cajan ) , the cowpea ( Vigna unguiculata ) , and the seeds from several species of Lathyrus .