Myrtaceae : The Myrtle family, an extensive natural order of polypetalous exogens, either shrubs or trees. They have simple entire leaves , often dotted with resinous pellucid glands, and with an intromarginal vein, and regular, axillary, and solitary or spiked corymbose or panicled white, pink or yellow flowers with numerous stamens. Some yield useful products such as guavas, cloves, pimento and cajeput oil. The Eucalyptus tree is from this order.