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Flowers Calendar

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Spring (Mar. - May)

Species name (Scientific Name) Photo (Date Taken) Flowering Time (Month) Red Data Book Note
1 2 3 4 5 6 7 8 9 10 11 12
Angular Solomon's Seal (Polygonatum odoratum) Photo: Angular Solomon's Seal (May. 24) March - June Begins Flowering Flowering Time Flowering Time End Flowering

Cold region plant. Found from Hokkaido to Kyushu Island in mountain grasslands.

O-iwa-kagami (Schizocodon soldanelloides) Photo: O-iwa-kagami (Apr. 26) April - May Begins Flowering End Flowering

Sub-alpine plant. Found along the riverbed in the Kumi area of Dogo Island. On the mainland of Japan this plant is found in sub-alpine regions, however in Oki it is found at 0m above sea level.

Oki Rhododendron (Rhododendron japonoheptamerum Kitam. var. okiense) Photo: Oki Rhododendron (Apr. 23) April - May Begins Flowering End Flowering Native species of the Oki Islands
Vulnerable Species (Shimane Prefecture)

Cold region plant. Endemic rhododendron found in Dogo Island. Rhododendron are found on mountain ridges and rocky fields, however in Oki they are also found on flat plains. An Oki Rhododendron festival takes place in Murakami-ke Residence in the Goka Area in late April.

Oki Dandelion (Taraxacum platycarpum subsp. maruyamanum) Photo: Oki Dandelion (Apr. 12) April - May Begins Flowering End Flowering Native species of the Oki Islands

A variety of Japanese dandelion found all around the Oki Islands. Suveys and removal of the stronger, invasive Western dandelion are taking place around the islands to protect the environment of this native species.

Oni-hyou-tan-boku Honeysuckle (Lonicera vidalii) Photo: Oni-hyou-tan-boku Honeysuckle (Apr. 19) April - June Begins Flowering Flowering Time End Flowering Near Threatened (Shimane Prefecture)
Vulnerable (Japan)

Continental plant. Found in secluded areas from the Tohoku region to the Chugoku region. Within Shimane Prefecture it is only found in the Oki Islands.

Katakuri (Erythronium japonicum) Photo: Katakuri (Mar. 22) March - April Begins Flowering End Flowering Vulnerable (Shimane Prefecture)

Cold region plant (Northern-japan). Found in the Katakuri Garden in Dogo Island. Found in mountainous areas on the mainland, in Oki it is found close to the sea. This plant's environment are maintained by local volunteers.

Siebold's viburnum (Viburnum sieboldii) Photo: Siebold's viburnum (Apr. 30) April - May Begins Flowering End Flowering

Cold region plant (Northern-japan). A native species of Japan found in Honshu, Shikoku, Kyushu and Ryukyu Islands.

Choji-gamazumi (Viburnum carlesii var. bitchiuense) Photo: Choji-gamazumi (Apr. 16) April - June Begins Flowering Flowering Time End Flowering Near Threatened (Shimane Prefecture)
Near Threatened (Japan)

Warm region plant. Found in limited areas on the mainland (Chugoku, Shikoku and Kyushu regions), in Oki it is commonly found on the coast and in rocky areas on the coast.

Japanese rowan (Sorbus commixta var. wirfordii) Photo: Japanese rowan (May. 21) May - June Begins Flowering End Flowering

Warm region plant. Found in coastal areas around the Oki Islands. The fruit can be used to make fruit liquor. The leaves turn red in autumn.

Japanese skimmia (Skimmia japonica var. intermedia f. repens) Photo: Japanese skimmia (Apr. 10) April - June Begins Flowering Flowering Time End Flowering

Cold region plant. Whilst typically found on forest floors in areas with heavy snow fall on the mainland, this plant can also be found in Oki.

Japanese cheesewood (Pittosporum tobira) Photo: Japanese cheesewood (May. 14) April - June Begins Flowering Flowering Time End Flowering

Warm region plant. Found south of the Tohoku Region and below, Shikoku, Kyushu and Ryukyu Islands. The Japanese name, "Tobera" (Door) comes from the tradition of placing it in the doorway to ward off evil spirits during the last day of winter on the traditional calendar.

Wild radish (Raphanus sativus var. raphanistroides) Photo: Wild radish (May. 21) April - June Begins Flowering Flowering Time End Flowering

This wild radish is found along the coast in the Oki Islands. The stalk is spicy and can be used as a condiment. Every spring, a Wild radish festival takes place in Chiburijima Island where the flowers bloom all over Mt. Akahage.

Hotaru-gazura (Lithospermum zollingeri) Photo: Hotaru-gazura (Apr. 20) April - June Begins Flowering Flowering Time End Flowering Near Threatened (Shimane Prefecture)

Found all over Japan, in Oki it is found in coastal, forest and mountainous grassland areas.

Mitsuba-iwagasa (Spiraea blumei var. obtusa) Photo: Mitsuba-iwagasa (May. 18) April - May Begins Flowering End Flowering

Continental plant. Found west from Fukui Prefecture along the Sea of Japan side, and the southern part of Korean Peninsula. In Oki, it is found on the coast, and rocky areas and cliffs on the roadsides.

Wild Camellia japonica (Camellia japonica) Photo: Wild Camellia japonica (Nov. 12) November - April Flowering Time Flowering Time Flowering Time End Flowering Begins Flowering Flowering Time

A native species found all over Japan excluding Hokkaido Island, this evergreen broadleaf tree is also found on all four Oki Islands.

Paeonia japonica (Paeonia japonica) Photo: Paeonia japonica (Apr. 23) April - June Begins Flowering Flowering Time End Flowering Near Threatened (Japan)

Cold region plant. Found in mountainous regions on the mainland, but in Oki it is found on the coast.

Yukiguni-mitsuba-tsutsuji (Rhododendron lagopus) Photo: Yukiguni-mitsuba-tsutsuji (Apr. 23) April - May Begins Flowering End Flowering

Cold region plant (Northern species). Found in areas with heavy snow fall on the mainland, but can be seen on the coast in Oki.

Summer (Jun. - Aug.)

Species name (Scientific Name) Photo (Date Taken) Flowering Time (Month) Red Data Book Note
1 2 3 4 5 6 7 8 9 10 11 12
Bigleaf hydrangea (Hydrangea macrophylla) Photo: Bigleaf hydrangea (Jul. 27) May - July Begins Flowering Flowering Time End Flowering

Hydrangeas bloom during the rainy season. However, around the Shirashima Coast in Dogo Island, they can be found flowering throughout winter.

Ezo-no-yoroigusa (Angelica sachalinensis) Photo: Ezo-no-yoroigusa (Jun. 28) June - August Begins Flowering Flowering Time End Flowering Critically Endangered (Shimane Prefecture)

Cold region plant. In Japan, this plant is found in northern Honshu and Hokkaido Islands. However, it is also found in Oki (Dogo Island) and Mt. Daisen (Tottori Prefecture). In Oki it can be found in sunny areas on the roadside or forest edges.

Oki Thistle (Cirsium japonicum var. okiense) Photo: Oki Thistle (May. 16) May - August Begins Flowering Flowering Time Flowering Time End Flowering Native species of the Oki Islands

This native thistle can be easily seen around the Oki Islands. Compared with its counterpart on the mainland, it is thornier, with particularly sharp thorns around the base of the flower.

Glorytree (Clerodendrum trichotomum) Photo: Glorytree (Jul. 30) July - September Begins Flowering Flowering Time End Flowering

Warm region plant. This pioneer species can be found all around the Japanese archipelago. The leaves can be eaten as tempura.

Shirouma-asatsuki (Allium shoenoprasum var.orientale) Photo: Shirouma-asatsuki (Jun. 7) June - July Begins Flowering End Flowering

Cold region plant (Sub-alpine species). This plant is a type of wild spring onion found all around the Oki Islands. On the mainland it is found in sub-alpine mountainous areas, however in Oki it lives on the coast.

Takeshima-shishiudo (Dystaenia takeshimana) Photo: Takeshima-shishiudo (Jul. 6) June - July Begins Flowering End Flowering Critically Endangered (Shimane Prefecture)

This plant was designated as Cultural Property of Ama Town in 2012. It has only been discovered on the two isolated islands of Ama Town of the Oki Islands (Nakanoshima Island) and Ulleung-do Island of South Korea. It can be seen on the Akiya Coast in Nakanoshima Island. It is called Takeshima-shishiudo, as Ulleung-do was referred to as Takeshima.

Nagoran orchid (Sedirea japonica) Photo: Nagoran orchid (Jul. 10) June - July Begins Flowering End Flowering Critically Endangered (Shimane Prefecture)
Endangered (Japan)

Warm region plant. Northernmost extent of Japan (according to a Shimane Prefecture Survey). This plant can be seen around Kasuga Shrine in Dogo Island. Whilst it is usually found growing around fir or oak trees on the mainland, in Oki it is found on Japanese arborvitae, Japanese white pine and black pine trees. Also, in Oki, the leaves of the normally evergreen plant become wrinkled and hybernate throughout the winter.

Calanthe orchid (Calanthe reflexa) Photo: Calanthe orchid (Aug. 16) July - August Begins Flowering End Flowering Vulnerable (Shimane Prefecture)
Vulnerable (Japan)

Found in the mountainous areas of Honshu, Shikoku and Kyushu Islands. In Oki it is found on forest floors on all islands except for Chiburijima Island.

Hamanasu (Rosa rugosa) Photo: Hamanasu (May. 3) May - August Begins Flowering Flowering Time Flowering Time End Flowering Critically Endangered (Shimane Prefecture)

Cold region plant. This plant is found in northern Japan on the coasts of Hokkaido and Tohoku Region. In Oki it is found on the coast in front of Kasuga Shrine in Dogo Island. Just across the road you can find the southern flower, nagoran orchid. This is the only known place where these flowers are found in the same environment.

Cornus kousa (Benthamidia japonica) Photo: Cornus kousa (Jun. 10) June - July Begins Flowering End Flowering

Cold region plant. This flower is found on mountain ridges and around beech forests from Honshu to Kyushu Island.

Autumn & Winter (Sep. - Feb.)

Species name (Scientific Name) Photo (Date Taken) Flowering Time (Month) Red Data Book Note
1 2 3 4 5 6 7 8 9 10 11 12
Oki-no-abura-giku (Dendranthema okiense) Photo: Oki-no-abura-giku (Oct. 17) September - October Begins Flowering End Flowering Native species of the Oki Islands

Only found in Shimane and Yamaguchi Prefectures, this flower lives on the rocky coasts and roadsides of all four Oki Islands.

Daruma-giku (Aster spathulifolius) Photo: Daruma-giku (Oct. 4) September - November Begins Flowering Flowering Time End Flowering Near Threatened (Shimane Prefecture)

Continental plant. This plant is found on rocky coasts and cliffs along the Sea of Japan coastline from Shimane to Yamaguchi Prefecture, in Kyushu Island, and on the Korean Peninsula up to the Ussuri River around the Russia-China border.

Japanese speedwell (Veronica ornata) Photo: Japanese speedwell (Sep. 1) August - September Begins Flowering End Flowering Near Threatened (Shimane Prefecture)
Vulnerable (Japan)

This plant is commonly found in all of the islands, in particular Chiburijima Island. It lives on rocky coasts and more rarely on rocky outcrops and roadside slopes in inland areas. It is also found in parts of the Sea of Japan coast in Tottori, Hyogo and Kyoto Prefectures.

Himehigo-tai thistle (Saussurea pulchella) Photo: Himehigo-tai thistle (Jul. 30) August - October Begins Flowering Flowering Time End Flowering Vulnerable (Japan)

Continental plant. Found in Hokkaido, Honshu, Shikoku, Kyushu and China and eastern Siberia in sunny grassland areas.

Miyama-uzura orchid (Goodyera schlechtendaliana) Photo: Miyama-uzura orchid (Aug. 31) August - September Begins Flowering End Flowering

Cold region plant. This plant is found in Hokkaido, Honshu. Shikoku and Kyushu Islands from flat plains to mountainous areas.

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