(First upload on September 20 2009. Last on February 19 2024) [ 日本語 | English ]
Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily
HOME > Plant list (植物リスト) > Asteraceae (キク科) > Helianthus tuberosus
Helianthus L.[ H. laevigatus | H. tuberosus | H. annuus | H. cucumerifolius or debilis ] ☛ H. strumosusKiku-imo (キクイモ, 菊芋), Jerusalem artichoke Buta-imo (ブタイモ) Lifeform: perennial forb Distribution: native to the North America (exotic to Japan) Habitat: woodlands, cultivated fields, roadsides, etc. |
Ligulate flower ≈ 10-20 with 3-5 lobed top ⇔ H. strumosus
Chromosome number: 2n = 68 or 102 A couple of cultivars (e.g., boston red, dwarf sunray, fuseau, long red, and stampede)
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[1] a clonal patch at a park, N28/E4, Sapporo City, on August 30 2009. [2] close-up of leaves at the edge of Keiteki-no-mori Forest (恵迪の森) in Hokkaido University campus on August 31 2009. I have never seen the flower in the city of Sapporo. That may suggest that this species is vegetatively reprodued only in the region. [3/4] at the campus of Hokkaido University of Education at Hakodate, southern Hokkaido, on September 26 2014. [5/6] near the intersection of the Shubuto River and the National Road Route 220, western Hokkaido, on October 12 2023.
Yanagibahimawari (ヤナギバヒマワリ, 柳葉向日葵), smooth sunflower confusing with Helianthus salicifolius A. Dietr., because the common name is willowleaf sunflower |
Lifeform: rhizomatous, perennial forb Distribution: north America (east-central and southeastern United States from Georgia to Maryland) |
Cultivars: golden pyramid, yellow submarine |
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[1/2] cv. golden pyramid in a large garden store, Sapporo, on November 4 2017.
Himehimawari (ヒメヒマワリ, 姫向日葵) Lifeform: annual forb Origin: North America, cultivar of H. annuus |
Habitat: escaped but not establsiihed |
Chromosome number: 2n = 34 Synonyms: Helianthus debilis Nutt., often used |
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[1-3] along Hokudai Street in front of Hokkaido University Hospital on September 12 2022.
Himawari (ヒマワリ, 向日葵), sunflower Lifeform: annual forb |
Distribution: native to western North America Habitat: escaped from gardening |
Seed: utilized for food and oil Cultivar: Tohoku Yae (東北八重): semi-dwarf and double-flowered |
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[1-3] close to a bridge on Sosei River at N10/E1, Sapporo. [1/2] a bumble bee on an inflorescence on August 22 2013. [3] on August 21 2013. [4] used for a growth experiment at the backyard of GSEES on June 13 2020.
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[1/2] under a street tree near Fuji Woman's University, Sapporo, on October 9 2018. [3] under a street tree in N18/W5, North Ward, Sapporo, on October 19 2022.