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(First upload on October 5 2010. Last on April 5 2017) [ 日本語 | English ]

Ginkgo biloba L.






Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Ginkgoaceae (イチョウ)
One species in one genus in the world
Gkinkgo L. (イチョウ)
Icho (イチョウ, 銀杏/公孫樹/鴨脚樹), maidenhair tree or ginkgo
Life form: deciduous tree
Distribution: originally in China (transplanted to verious regions where mean annual temperature ranges from 0°C to 20°C and annual precipitation is from 500 mm to 2000 mm)
Shoot: long and short shoots

Long shoot: alternate
Short shoot: leaves fascicled (= fasciculate. n, facicle 束)

⇒ Engler's syllabus (エングラー体系)

var. epiphylla Makino (オハツキイチョウ)
var. laciniata Hort. (キレハイチョウ)
var. pendula Hort. (シダレイチョウ)
var. variegata Henry (フイリイチョウ)

Ginkgo biloba in Japan


ST1 ST2 ST3

ST4 ST5 ST6
[1] a streed made by G. biloba. [2] shoots. [3] close-up of leaf. [1/2] at Icho Street (N12) in the campus of Hokkaido University on September 10 2010. [3] at an arboretum in Teshio Experimental Forset, HU, on September 13 2010. [4] a bark (樹皮 on a street tree, 1 Mishima, Tokyo, on May 30 2014. [5] fruits of a transplantation at N26/E2, East Ward, on April 7 2014. [6] a giant tree (巨木), head-staking ginkgo, at Hibiya Park, Tokyo, on December 27 2014.


ST1 ST3 ST2
[1] cv pendula (シダレイチョウ). [2] cv tubifolia (ラッパイチョウ), not be identified without the leaves. [3] the tree discovered sperms. [1-3] in the Koishikawa Botanical Garden (小石川植物園), the University of Tokyo, on March 16 2017.


The spermatozoid of Ginkgo biloba was first discovered in seeds obtained from this female tree by Sakugoro Hirase, who was a teaching assistant in the Botanical Institute, Imperial University, and was studying the fertilization and embryo development of Ginkgo. This finding is believed one of the most important contributions from the early days of Japanese botany.

Morphology of Ginkgo biloba


ST
Fig. 1. female flower, 2. female flower (partial), 3. male flower, 4. leaf
ST
Fig. 2. Reproductive organs and tissues on G. biloba
索引
ST
ST
On June 7 1983 (by ST).
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