Lagerstroemia speciosa, commonly known as the Queen's Crape Myrtle or Banaba, is a species of flowering tree native to Southeast Asia. It belongs to the Lythraceae family and is known for its attractive flowers and medicinal properties.

Here are some key characteristics and information about Lagerstroemia speciosa:

1. Appearance: Queen's Crape Myrtle is a deciduous tree that can reach a height of 20 to 30 meters (65 to 100 feet) and has a spread of about 8 to 15 meters (25 to 50 feet). It has smooth, grayish bark and a dense, rounded crown. The leaves are simple, oblong to elliptical in shape, and about 20 centimeters (8 inches) long. They are green and turn red or yellow before shedding in the fall.

2. Flowers: The tree produces large, showy flowers that are usually white or pink. The flowers have crinkled petals and are arranged in dense, terminal panicles that can be up to 30 centimeters (12 inches) long. The flowering period typically occurs during the summer months.

3. Fruit: After the flowers fade, they give way to small, woody capsules that contain numerous tiny seeds. These capsules persist on the tree throughout the winter season.

4. Medicinal Uses: Lagerstroemia speciosa has a long history of use in traditional medicine. Various parts of the tree, including the leaves, bark, and flowers, are used in herbal preparations. The tree is particularly valued for its potential antidiabetic properties, and extracts from the leaves are often used to help regulate blood sugar levels.

5. Ornamental Plant: Due to its attractive flowers and overall appearance, Lagerstroemia speciosa is commonly planted as an ornamental tree in gardens, parks, and streetscapes. It thrives in tropical and subtropical climates and is often used as a shade tree.

6. Cultivation: The tree prefers full sun and well-drained soil but can tolerate a range of soil types. It is relatively drought-tolerant once established but benefits from regular watering, especially during dry periods. Lagerstroemia speciosa can be propagated through seeds or vegetative methods such as stem cuttings.

It's worth noting that while Lagerstroemia speciosa has several potential medicinal uses, it's important to consult with a healthcare professional or an expert in herbal medicine before using it for any therapeutic purposes.