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(First upload on August 25 2008. Last on February 9 2024) [ 日本語 | English ]

Rosa L. (バラ) Hamanasu or hamanashi (ハマナス, 浜梨), Japanese rose or sea tomato Lifeform: Shrub less than 2 m in height, making dense thickets Distribution: Nothern China - Korea - Japan the flower of Hokkaido Habitat: Sandy or gravely seashore (海浜)

生命環境野外実習 Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト) Fruit: orange-colored pomaceous fruit (rose hip) Chromosome number: 2n = 14 f. alba (Ware) Rehder (シロバナハマナス) Cultivars Double-flowered F.J. Grootendorst (de Goey): red → Pink Grootendorst (F.J. Grootendorst): pink → White Grootendorst (Paul Eddy): white

Rosa rugosa in Hokkaido

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[1/2] at Higashi-Kunebetsu Coast in the city of Hokuto, southern Hokkaido, Japan, on August 4 2008. [3] at Ishikari Coast, close to the area where the establihsment of wind farm is planed, on September 3 2015. [4] at Ishikari Coast Plant Conservation Center on July 10 2011. The characteristics of R. rugosa on this coast are very short, i.e., less than 20 cm tall, probably because the flat topography does not protect the plants from strong wind. [5] on Arutori Cape faced to Funka Bay, southern Hokkaido, on July 25 2013. [6] along an unpaved road near Zenibako Coast (銭函海岸), where wind-power farm is established, near Sapporo on September 16 2020. Records: along the seacoast of Usujiri Fisheries Station, southern Hokkaido, on June 20 2024.

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f. alba

Shirobanahamanasu (シロバナハマナス, 白花浜梨)
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Double-flowered cultivar [1/2] at a hedge in N21/W2, North Ward, Sapporo, on September 7 2015. [3] under a street tree on June 23 2015.

cv Pink Grootendorst

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[1-3] in a house garden, N27/E2, East Ward, Sapporo, on July 2 2018.

Rosa blanda Aiton transplanted in Hokkaido

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Smooth rose, meadow rose, wild rose or prairie rose Lifeform: deciduous shrub

Distribution: North America (Kansas and North Dakota) Habitat: prairies and meadows, dry hillsides, roadsides, fence rows, etc. in either sandy or rocky soil

Morphological remarks: similar with Rosa multiflora, an invasive species from Japan Hybrid: hybridization with Rosa rugosa reported from eastern North America

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[1-3] on a fruticetum in Hokkaido University Botanic Garden on September 30 2023.