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(First upload on December 20 2004. Last on June 22 2020) [ 日本語 | English ]

Polygonum L. (タデ) Urajiro-tade (ウラジロタデ, 裏白蓼), Chinese knotweed or Weyrich's knotweed Lifeform: 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 Synonyms Aconogonum weyrichii (Fr. Schmidt.) Nakai Persicaria 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) Synonyms Aco. weyrichii (F. Schmidt) H. Hara var. alpinum (Maxim.) H. Hara Aco. 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)

Polygonum weyrichii on in Hokkaido

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Volcanoes

1 2 3
4 5 6
[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.

Wetlands

1 2
[1/2] in Abira wetland, central Hokkaido, on June 16 2020.

Flowers and seeds

1 2
[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).