Citrus japonica 'Hindsii' (common names: Hong Kong Kumquat or Wild Kumquat) is a species of Kumquat. It produces small edible round fruits the size of a pea. The fruit are bright orange when ripe. In warmer areas They are grown in gardens as an ornamental plant. They are also kept as houseplants and are used in bonsai. The branches have thorns.Carl Peter Thunberg originally classified the kumquats as members of the citrus genus in 1784 in his book Flora Japonica. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Plant