Black Matpe Beans

Urad (Vigna mungo), also referred to as urad dal, udad dal, urd bean, urd, urid, black matpe bean, black gram, black lentil (not to be confused with the much smaller true black lentil (Lens culinaris)), maas (in Nepali), đậu đen (Vietnamese, literally: black bean) or white lentil (Vigna mungo), is a bean grown in southern Asia. It is largely used to make dal from the whole or split, dehusked seeds. It, along with the mung bean, was placed in Phaseolus but has been transferred to Vigna. It was at one point considered to belong to the same species as the mung bean.
Black gram originated in India where it has been in cultivation from ancient times and is one of the most highly prized pulses of India. It has also been introduced to other tropical areas mainly by Indian immigrants.