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(First upload on October 5 2010. Last on February 23 2024) [ 日本語 | English ]

Engler's syllabus (エングラー体系) 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), maidenhair tree or ginkgo Etymology: biloba = two lobes Lifeform: deciduous, tall 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) ☛ fossil record

Shoot: long and short shoots Long shoot: alternate Short shoot: leaves fascicled (= fasciculate. n, facicle 束) 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) Giant tree Head-staking ginkgo (首賭けイチョウ), at Hibiya Park, Tokyo, on December 27 2014 Kakuo Temple (覚王寺) Hokkaido government office (道庁)

Ginkgo biloba in Japan

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[1/2] at Icho Street (銀杏並木) in the campus of Hokkaido University on September 10 2010. [3] at an arboretum in Teshio Experimental Forest, 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.

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[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.

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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

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Fig. 1. female flower, 2. female flower (partial), 3. male flower, 4. leaf Fig. 2. Reproductive organs and tissues on G. biloba

Leaf Vein: open dichotomous Cuticle: hypostomatic (recessed pores) Petiole: flexible (mostly slender) On June 7 1983, sketched by ST.