蜜桃av

Ginkgo (Ginkgo biloba)
DBH: 73.31 cm measured on 2/18/2022


From Wikipedia the free encyclopedia,

Ginkgo biloba, commonly known asginkgoorgingko()also known as themaidenhair tree,is a species of tree native to China. It is the last living species in the order, which first appeared over 290 million years ago. Fossils very similar to the living species, belonging to the genus, extend back to theapproximately 170 million years ago.The tree was cultivated early inand remains commonly planted.

Ginkgo leafis commonly used as a, but there is nothat it supports human health or is effective against any disease.

The genus name is regarded as a misspelling of thegin kyofor the銀杏 meaning "silver apricot",which is found inliterature such as日用本草(Daily Use) (1329) and本草綱目published in 1578.

Despite its spelling, which is due to a complicated etymology including a transcription error, "ginkgo" is usually pronounced, which has given rise to the common alternative spelling "gingko". Theis also documented in some dictionaries.

first introduced the spellingginkgoin his bookAmoenitatum Exoticarum. It is considered that he may have misspelled "Ginkyo" as "Ginkgo". This misspelling was included byin his bookMantissa plantarum IIand has become the name of the tree's genus.

Ginkgos are large trees, normally reaching a height of 20–35m (66–115ft),with some specimens in China being over 50m (165ft). The tree has an angularand long, somewhat erratic branches, and is usually deep rooted and resistant to wind and snow damage. Young trees are often tall and slender, and sparsely branched; the crown becomes broader as the tree ages. A combination of resistance to disease, insect-resistant wood, and the ability to formand sprouts makes ginkgos durable, with some specimens claimed to be more than 2,500years old.

Leaves[]



Ginkgoleaves in summer



Ginkgoleaves in

Theare unique among seed plants, being fan-shaped with veins radiating out into the leaf blade, sometimes bifurcating (splitting), but neverto form a network.Two veins enter the leaf blade at the base and fork repeatedly in two; this is known as. The leaves are usually 5–10cm (2–4in), but sometimes up to 15cm (6in) long. The old common name,maidenhair tree, derives from the leaves resemblingof the maidenhair fern,.[]Ginkgos are prized for their autumn foliage, which is a deep.

Leaves of long shoots are usually notched or lobed, but only from the outer surface, between the veins. They are borne both on the more rapidly growing branch tips, where they are alternate and spaced out, and also on the short, stubby spur shoots, where they are clustered at the tips. Leaves are green both on the top and bottomand have stomata on both sides.During autumn, the leaves turn a bright yellow, then fall, sometimes within a short space of time (one to 15days).[]

Branches[]

Ginkgo branches grow in length by growth of shoots with regularly spaced leaves, as seen on most trees. From theof these leaves, "spur shoots" (also known as short shoots) develop on second-year growth. Short shoots have very short(so they may grow only one or two centimeters in several years) and their leaves are usually unlobed. They are short and knobby, and are arranged regularly on the branches except on first-year growth. Because of the short internodes, leaves appear to be clustered at the tips of short shoots, and reproductive structures are formed only on them (see pictures below – seeds and leaves are visible on short shoots). In ginkgos, as in other plants that possess them, short shoots allow the formation of new leaves in the older parts of the crown. After a number of years, a short shoot may change into a long (ordinary) shoot, or vice versa.[]

Ginkgo bilobacross section of tree trunk (source:)Ginkgo prefers full sun and grows best in environments that are well-watered and well-drained. The species shows a preference for disturbed sites; in the "semiwild" stands at, many specimens are found along stream banks, rocky slopes, and cliff edges. Accordingly, ginkgo retains a prodigious capacity for vegetative growth. It is capable of sprouting from embedded buds near the base of the trunk (, or basal chichi) in response to disturbances, such as soil erosion. Old individuals are also capable of producing aerial roots on the undersides of large branches in response to disturbances such as crown damage; these roots can lead to successful clonal reproduction upon contacting the soil. These strategies are evidently important in the persistence of ginkgo; in a survey of the "semiwild" stands remaining in, 40% of the specimens surveyed were multistemmed, and few saplings were present.:?86–87?搁别辫谤辞诲耻肠迟颈辞苍摆]

Ginkgo bilobais, with separate, some trees beingand others being.Male plants produce smallwith, each bearing twospirally arranged around a central axis.

Female plants do not produce cones. Twoare formed at the end of a stalk, and after,one or both develop into seeds. The seed is 1.5–2cm long. Its fleshy outer layer (the) is light yellow-brown, soft, and-like. It is attractive in appearance, but contains(also known as butanoic acid) and smells like rancidor vomitwhen fallen. Beneath the sarcotesta is the hard(the "shell" of the seed) and a papery, with thesurrounding the femaleat the center.