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ginkgo

ginkgo gĭng´kō [key] or maidenhair tree, tall, slender, picturesque deciduous tree (Ginkgo biloba) with fan-shaped leaves. The ginkgo is native to E China, where it was revered by Buddhist monks and planted near temples; it is unclear if any truly wild stands still exist. A living fossil, the ginkgo is the only remaining species of a large order (Ginkgoales) of gymnosperms that existed in the Triassic period. Its form has not changed in millions of years, as is shown by fossils widely scattered over Europe, North and South America, and Asia. The ginkgo is valued today as a street tree, being exceptionally tolerant of smoke, low temperatures, and minimal water supply. Slow growing, the ginkgo is also long-lived. The male and female strobile (see cone) are borne on separate trees. The fruit, botanically a seed, is surrounded by a malodorous pulp, making the male trees more desirable as ornamentals; however, the seed kernel is highly esteemed in East Asia as a food. The herbal remedy ginkgo biloba, an extract of ginkgo leaves, is said to enhance concentration and short-term memory, but the claim has not been verified in controlled studies. The ginkgo is classified in the division Pinophyta, class Ginkgoopsida, order Ginkgoales, family Ginkgoaceae.

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