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Nicotiana glauca is a species of flowering plant in the tobacco genus Nicotiana of the nightshade family Solanaceae. It is known by the common name tree tobacco.Its leaves are attached to the stalk by petioles (many other Nicotiana species have sessile leaves), and its leaves and stems are neither pubescent nor sticky like Nicotiana tabacum.
Mitragyna speciosa is a tropical evergreen tree of the Rubiaceae family (coffee family) native to Southeast Asia. [3] It is indigenous to Cambodia, Thailand, Indonesia, Malaysia, Myanmar, and Papua New Guinea, [4] where its leaves, known as "kratom" have been used in herbal medicine since at least the 19th century. [5]
The fruit is a long, thin legume-like capsule, 20–40 cm (7.9–15.7 in) long and 10–12 mm (0.39–0.47 in) in diameter; it turns brown in the fall and often stays attached to tree during winter (and can be mistaken for brown icicles). The pod contains numerous flat, light brown seeds with two papery wings.
Although its weak wood, irregular form, and prolific seeding might make it seem like a poor choice for a landscape tree, A. negundo is one of the most common maples in cultivation. Long-term success has been noted as far north as Yellowknife. [26] Many cultivars have been developed, such as: [5] 'Auratum' – yellowish leaves with smooth undersides
The leaves are about 8 to 20 cm (3–8 in) long, smooth, toothed, [11] soft, and irregularly undulated. [12] The upper surface of the leaves is a darker green, and the bottom is a light green. [11] The leaves have a bitter and nauseating taste, which is imparted to extracts of the herb, and remains even after the leaves have been dried. [12]
They develop from stipules [10] (small leaf-like structures that grow at the base of leaves), and since stipules are paired at the base of leaves, the spines will be paired at the bases of leaves. They range from .65–2 cm ( 1 ⁄ 4 – 3 ⁄ 4 in) in length and are somewhat triangular with a flared base and sharp point.
It grows as a spreading tree up to 20 m (70 ft) tall, with its trunk covered by a white, beige and grey thick papery bark. The grey-green leaves are egg-shaped, and cream or white bottlebrush-like flowers appear from late spring to autumn. It was first formally described in 1797 by the Spanish naturalist Antonio José Cavanilles.
The plant's flowers are yellow and grow up to an inch in diameter, with five petals attached at the base. Flowers grow on stalks and can either be found in clusters or individually where the stalk meets the leaf stem. [4] Pod-like capsules produced by the plant consist of 12-15 wood segments that form cup-like rings.