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This article presents information on the registration of Flor de Mayo 2000 common bean. Flor de Mayo 2000 common bean or Phaseolus vulgaris was developed and released by the Valle del Guadiana Experiment Station of the National Research Institute for Agriculture, Forestry and Livestock of Mexico as a high-yielding, disease-resistant cultivar for rainfed conditions in the highlands of Mexico. The commercial for de mayo bean class in Mexico is classified as a medium-sized bean with a light pink-purple circular marbling pattern on a chamois background that becomes progressively less frequent from the hilum to the dorsal side of the seed. Flor de Mayo 2000 was tested extensively in both the subhumid and semiarid highlands of Mexico for yield and agronomic traits at 23 locations from 1994 to 2003. Flor de Mayo 2000 averaged 40 cm in height and exhibits an indeterminate Type IIIa growth habit, with pod distribution throughout the plant canopy. Flor de Mayo 2000 produces white blossoms and flowers 45 d after planting, although flowering is delayed at elevations above 2300 m asl in the subhumid highlands. Flor de Mayo 2000 is a midseason cultivar, maturing 94 d after planting with a range in maturity from 90 to 99 d, depending on season and altitude.