Gen-ichi Koidzumi

Wasabi (Japanese: ワサビ, わさび, or 山葵, pronounced [waꜜsabi]) or Japanese horseradish (Eutrema japonicum syn. Wasabia japonica) is a plant of the family Brassicaceae, which also includes horseradish and mustard in other genera. The plant is native to Japan, the Russian Far East including Sakhalin, and the Korean Peninsula. It grows naturally along stream beds in mountain river valleys in Japan. Wasabi is grown for its rhizomes, which are ground into a paste as a pungent condiment for sushi and other foods. It is similar in taste to hot mustard or horseradish rather than chilli peppers, in that it

Pinus amamiana (Amami pine, Yakushima white pine) is a species of pine. It is a native of southern Japan, on the islands of Yakushima and Tanegashima south of Kyūshū. It has also been grown horticulturally in Japanese parks. This pine can grow to a height of 25 m with a trunk diameter of up to 1 m. The needles grow in bundles of five and the cones are 5–8 cm in length. This tree is known in Japanese as amami-goyōmatsu, amami-goyō, and yakutane-goyō.

Kalopanax septemlobus, common names castor aralia, tree aralia, and prickly castor oil tree, is a deciduous tree in the family Araliaceae, the sole species in the genus Kalopanax. It is native to northeastern Asia, from Sakhalin and Japan west to southwestern China. It is called cìqiū (刺楸) in Chinese, eumnamu (음나무) in Korean, and harigiri (ハリギリ; 針桐) in Japanese.

Acer shirasawanum, the Shirasawa maple or fullmoon maple (Japanese: オオイタヤメイゲツ, romanized: ooitayameigetsu), is a species of maple native to Japan, on central and southern Honshū (Fukushima Prefecture southwards), Shikoku, and Kyūshū.

Salix babylonica (Babylon willow or weeping willow; Chinese: 垂柳; pinyin: chuí liǔ) is a species of willow native to dry areas of northern China, Korea, Mongolia, Japan, and Siberia but cultivated for millennia elsewhere in Asia, being traded along the Silk Road to southwest Asia and Europe.

Angelica keiskei, commonly known under the Japanese name of ashitaba (アシタバ or 明日葉), literally "tomorrow's leaf", is a species of flowering plant in the carrot family. It is native to Japan, where it is found on the Pacific Coast. It is native to the area of the Bōsō Peninsula, Miura Peninsula, Izu Peninsula, and the Izu Islands. It has been widely cultivated outside its natural range.

Eleutherococcus sieboldianus, the five-fingered aralia or fiveleaf aralia, is a species of flowering plant in the family Araliaceae. It is native to Anhui province in China, and has been introduced to Korea, Japan and the United States. A variegated form is available which only reaches 8 ft (2.4 m).

Chikusichloa is a genus of Asian plants in the grass family. Species Chikusichloa aquatica Koidz. - Jiangsu, Honshu, Kyushu Chikusichloa brachyathera Ohwi - Nansei-shoto Chikusichloa mutica Keng - Guangdong, Guangxi, Hainan, Sumatra

Sorbus randaiensis is a species of deciduous tree in the family Rosaceae. It is endemic to the mountain areas of central Taiwan, with altitude 1,800m to 3,200m, mostly spotted in the forest of Xueshan, Hehuan Mountain, Mount Xiluan, and Nenggao Mountain. It is a tree 3–8 m tall with white flowers and reddish fruit.

Neolitsea sericea is a species of tree in the family Lauraceae. It is found in southeastern China (Zhejiang), Taiwan (Orchid Island, Green Island), south Korea, Japan, and the Ryukyu Islands. Its natural habitat is on forest margins and slopes, and it is often found in well-progressed secondary forests. It is a medium-size tree, growing up to 10 m (33 ft) tall. Its leaves are evergreen, and distinctly whitened on the back. It produces yellow flowers in the fall, and its fruit is a red berry. Neolitsea sericea contains two varieties, Neolitsea sericea var. sericea and Neolitsea sericea var.

Fraxinus lanuginosa (Japanese ash; Japanese: アオダモ Aodamo) is a species of ash native to Japan and to the Primorye region of eastern Russia. Fraxinus lanuginosa is a medium-sized deciduous tree growing to 10–15 m tall with a trunk up to 50 cm diameter. The bark is smooth, dark grey. The buds are pale pinkish-brown to grey-brown, with a dense covering of short grey hairs. The leaves are in opposite pairs, pinnate, 10–15 cm long, with 3–7 leaflets; the leaflets are broad ovoid, 4–7 cm long and 2–4 cm broad, downy at the base on the underside, with a finely serrated margin, and short indistinct

Celtis jessoensis, known as the Japanese hackberry or Jesso hackberry (from an archaic reading of "Ezo": Hokkaidō), is a species of hackberry native to Japan and Korea. It is a deciduous tree growing to 20–25 m (66–82 ft) tall. The leaves are 5–9 cm (2.0–3.5 in) long and 3–4 cm (1.2–1.6 in) broad, with a sharply serrated margin, glaucous beneath and downy on the leaf veins.

Taraxacum japonicum is a species of dandelion that grows in Japan.

Mukdenia rossii is a species of flowering plant in the saxifrage family, Saxifragaceae. It is the sole species in genus Mukdenia. It is a perennial native to Korea and northeastern China.

Atractylodes macrocephala (simplified Chinese: 白术; traditional Chinese: 白朮; pinyin: báizhú) is a species of Atractylodes that grows in central China. The roots are consumed as a Chinese herbal medicine.

Salix nakamurana (Japanese: renge-iwa-yanagi) is a rare species of willow native to alpine slopes of central Japan. It is a deciduous small prostrate shrub.

Quercus miyagii is a species of oak native to the Ryukyu Islands. It is placed in subgenus Cerris, section Cyclobalanopsis. A tree typically 12 metres (39 feet) tall, its acorns are consumed by the freshwater crabs Geothelphusa grandiovata and Candidiopotamon okinawense, which gather them and store them in their burrows.

Neolitsea aciculata is a species of small evergreen tree (trunk up to 4 m (13 ft)) in the family Lauraceae. It is found in Japan and Taiwan. In Taiwan, it grows often in mixed coniferous and broad-leaved forests in valleys throughout the island.

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Akebia trifoliata also known as chocolate vine, three leaf chocolate vine or three leaf akebia, is a species of flowering plant. It is a close relative of the more commonly known Akebia quinata.

Prunus jamasakura, the Japanese mountain cherry, is a species of flowering plant in the family Rosaceae that is said to be endemic to Japan. However, it is also said to be native to Korea, and to China.

Athyrium otophorum, the eared lady fern, is a species of fern in the family Athyriaceae, native to Japan and East Asia. It is deciduous and grows in a tufted oval formation to 50 centimetres (20 in) tall and wide. The triangular fronds open pale green before turning grey-green with maroon stems. Hardy down to −10 °C (14 °F) it is suitable for cultivation in any moist, partially-shaded spot with good drainage. In cultivation in the United Kingdom, this plant has gained the Royal Horticultural Society's Award of Garden Merit, as has the variety A. otophorum var. okanum.

Acer morifolium, the mulberry-leaf maple, is a species of flowering plant in the family Sapindaceae. It is endemic to the island of Yakushima, Japan. A tree reaching 10 m (33 ft), it is found in forests from sea level up to the highest point on the island; 1,936 m (6,350 ft). As its common and scientific names suggest, its leaves are very unlike most maples, and instead resemble the unlobed leaves of mulberries. Although rare in commerce, and confined to a 505 km2 (195 sq mi) island in the wild, it is assessed as Least Concern.

Viola utchinensis (オキナワスミレ, Okinawa sumire) is a species of flowering plant in the family Violaceae.

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Ligularia stenocephala is a species of the genus Ligularia and the family Asteraceae. It used to be Senecio.

Fatsia oligocarpella is a species of flowering plant in the family Araliaceae, native to the Bonin Islands and the Volcano Islands, both belonging to Japan.

Chenopodium formosanum is a Chenopodium species endemic to Taiwan. It was a key component of the diets of Taiwanese indigenous peoples and remains culturally and culinarily significant.

Wikstroemia pseudoretusa is a species of flowering plant in the family Thymelaeaceae that is endemic to the Bonin Islands, Tōkyō Metropolis, Japan.