(First upload on December 20 2004. Last on June 22 2020) [ 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) > Polygonaceae (タデ科) > Polygonum weyrichii
Polygonum L. (タデ)Urajiro-tade (ウラジロタデ, 裏白蓼), Chinese knotweed or Weyrich's knotweedLifeform: perennial forb growing up to 1.5 m Distribution: Sakhalin - north to central Japan Habitat: alpine slopes and gravelly places near the sea Flowering period: July-August on Mount Koma Flower: hermaphrodite pollinated by insects Chromosome number: 2n = 20 SynonymsAconogonum weyrichii (Fr. Schmidt.) NakaiPersicaria weyrichii (Fr. Schmidt ex Maxim.) Ronse Decr. Pleuropteropyrum weyrichii (Fr. Schmidt) H. Gross |
Pleuropteropyrum weyrichii (Fr. Schmidt) H. Gross var. alpicola Koidz. var. alpinum Maxim. (オンタデ), leaf = less hair, green underside (well-developed) SynonymsAco. weyrichii (F. Schmidt) H. Hara var. alpinum (Maxim.) H. HaraAco. weyrichii (F. Schmidt) H. Hara ssp. savatieri (Nakai) Tzvelev Ple. alpinum (Maxim.) Koidz. Ple. alpinum (Maxim.) Koidz. var. chokaense Koidz. Ple. weyrichii (F. Schmidt) H. Gross var. alpinum (Maxim.) H. Gross Pol. savatieri Nakai |
Aco. savatieri (Nakai) Tzvelev
⇒ compare to P. sachalinense (オオイタドリ) |
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[1/2] on the south slope of Mount Koma (flora), southern Hokkaido. [1] on July 9 2018. [2] on July 9 2009. The establishment pattern is regulated by microsites (Titus & Tsuyuzaki 2003). [3-5] near the summit of Mount Yotei (羊蹄山), central Hokkaido, on June 28 2014. [6] var. alpinum, close to the summit of Mount Tokachi (十勝岳), central Hokkaido, on August 6 2001.
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[1/2] in Abira wetland, central Hokkaido, on June 16 2020.
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[1] inflorescences on the south slope of Mount Koma on July 20 2011. [2] on December 19 2004, two days after imbibition. Seeds were collected from Mount Koma on September 8 2004 by Pecapyu Miyoshi (Tsuyuzaki & Miyoshi 2009).