(First upload on September 4 2008. Last on December 23 2015) [ 日本語 | English ]

Magnolia obovata Thunb.

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

Magnoliaceae Juss. (モクレン)

Ca. 220 tree species in 7 genera in the world
Characterized by the stamens and pistils in spirals on a conical receptacle (floral diagram)
Containing oil cells
Subfamily Magnolioideae

Elmerrillia Dandy
Kmeria (Pierre) Dandy
Magnolia L. (モクレン)
Manglietia Blume

Floral diagram

Michelia L. (オガタマノキ)
Pachylarnax Dandy
Subfamily Liriodendroidae
Liriodendron L. (ユリノキ)

⇒ Engler's syllabus (エングラー体系)

Magnolia L. (モクレン) in Japan

1. evergreen _____ M. grandiflora L. (タイサンボク), transplantation

1. deciduous

2. leaf large (20 40 cm long) _____ M. obovata Thunberg (ホオノキ)

2. leaf moderate < 18 cm long, sparsely alternate, bud scale piece hair

3. flowering in summer after leaf flushing _____ M. sieboldii K. Koch (オオヤマレンゲ), M. sieboldii × obovata (ウケザキオオヤマレンゲ)

3. flowering in early spring before leaf flushing

4. calyx not morphologically distinguised from petal, tepals nine _____ M. denudata Desr. (ハクモクレン) transplantation

4. calyx three, smaller than petal

5. petal slim, 12-18 _____ M. stellata (Sieb. et Zucc.) Maxim. (シデコブシ, star magnolia): originally in Honshu (transplanted in Hokkaido), var. keiskei Makino (ベニコブシ)

5. petal broad, 6 (7-12)

6. flower deep red - violet _____ M. liliflora Desr. (モクレン/シモクレン) transplantation [6 + 3 = 9]

6. flower white

7. leaf obovate _____ M. kobus DC (コブシ) [6 + 3 = 6], var. borealis (Sargent) Koidz. (キタコブシ), leaf/flower larger than the type

7. leaf lanceolate - oval-lanceolate _____ M. salicifolia (Sieb. et Zucc.) Maxim. (タムシバ)

Nomenclatrue: Ohwi & Kitagawa (1983)

Magnolia obovata in Hokkaido

Ho-noki (ホオノキ, 朴木), Japanese bigleaf magnolia
Lifeform: deciduous tall tree
Distribution: Endemic to Japan (except Ryukyu)
Habitat: forests

Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト)
flora on Mount Usu

Flower: the largest flower in Japan (≈ 20 cm in diameter)

1st day: pistil becomes mature
2nd day: pistil looses the pollination ability, and stamen becomes mature
→ avoiding self-pollination within a flower (but the geitonogamy occurs frequently)

Remarks: allelopathic plant → less forest-floor plants

Houpoea obovata (Thunb.) N. H. Xia et C. Y. Wu
Magnolia hypoleuca Sieb. et Zucc.

→ The Anthology of Myriad Leaves (万葉集)

[1/2] saplings in Tomakomai Experimental Forest on June 10 2008. [3] a terminal shoot at the foot of Mount Usu on August 25 2010. [4] in the crater basin on July 13 2015.

[5/6] a huge flower, close to the entrance of Hitsujigaoka Hill Park on June 18 2011. [7] in Tsukiura Forest Park faced to Toya Lake on September 15 2015.

M. grandiflora L. (タイサンボク) in Japan



The Southern Magnolia which was planted to commemorate
the sister city affilitation between Tokyo and New York City
This is the southern magnolia that originated in North America. The cities of New York and Tokyo entered into a sister city affilitation on February 29, 1960 when it was the 100th anniversary of the exchange of the Treaty of Amity and Commerce between the United States and Japan instrument of ratification. This tree was donated to he Tokyo Metropolitan Government to return courtesy after the chairperson of the Japanese residents in New York donated 100 cherry trees to New York City when the Governor visited after the affilitation.
This tree was planted here in Hibiya Park by Governor Azuma and Richard C. Patterson, representing the New York City Mayor, on May 23 1960. Southern magnolias bloom big pure white flowers from June to July.