Celastrales is a diverse order that has no conspicuous unique characteristic and is consequently hard to recognize. The flowers are usually small with a conspicuous nectary disk. The stipules are small or rarely absent. The micropyle has 2 openings and is therefore called a bistomal micropyle. Flowers with well-developed male and female parts are often functionally unisexual. The seed often has an aril. In bud, the sepals have a quincuncial arrangement. This means that 2 sepals are inside, 2 are outside, and the other has one side covered and one side exposed.