(Aegle marmelos)
Aegle marmelos, commonly known as bael (or bili or bhel), also Bengal quince, golden apple, Japanese bitter orange, stone apple or wood apple, is a rare species of tree native to the Indian subcontinent and Southeast Asia. It is present in India, Bangladesh, Sri Lanka, Nepal as a naturalized species. The tree is considered to be sacred by Hindus. The bael fruit typically has a diameter of between 5 and 12 cm. It is globose or slightly pear-shaped with a thick, hard rind and does not split upon ripening. The woody shell is smooth and green, gray until it is fully ripe when it turns yellow. Inside are 8 to 15 or 20 sections filled with aromatic orange pulp, each section with 6 (8) to 10 (15) flattened-oblong seeds each about 1 cm long, bearing woolly hairs and each enclosed in a sac of adhesive, transparent mucilage that solidifies on drying. The exact number of seeds varies in different publications. The fruit takes about 11 months to ripen on the tree and can reach the size of a large grapefruit or pomelo, and some are even larger. The shell is so hard it must be cracked with a hammer or machete. The fibrous yellow pulp is very aromatic. It has been described as tasting of marmalade and smelling of roses. Boning (2006) indicates that the flavor is "sweet, aromatic and pleasant, although tangy and slightly astringent in some varieties. It resembles a marmalade made, in part, with citrus and, in part, with tamarind." Numerous hairy seeds are encapsulated in a slimy mucilage. Aegle marmelos is native across the Indian subcontinent and Southeast Asia, and is cultivated throughout Sri Lanka, Tamilnadu, Thailand, and Malesia. It occurs in dry, open forests on hills and plains at altitudes from 0–1,200 m (0–3,937 ft) with mean annual rainfall of 570–2,000 mm (22–79 in). It has a reputation in India for being able to grow in places that other trees cannot. It copes with a wide range of soil conditions (pH range 5–10), is tolerant of waterlogging and has an unusually wide temperature tolerance from −7–48 °C (19–118 °F). It requires a pronounced dry season to give fruit. The tree is a larval food plant for the following two Indian Swallowtail butterflies, the Lime butterfly Papilio demoleus, and the Common Mormon: Papilio polytes.