Polygonum weyrichii Fr. Schmidt ex Maxim.
[Polygonaceae]
Urajiro-tade (ウラジロタデ, 裏白蓼)
Lifeform: perennial forb growing up to 1.5 m
Flowering period: July-August on Mount Koma
Flower: hermaphrodite pollinated by insects
Habitats: alpine slopes and gravelly places near the sea
Synonums
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.
Polygonum weyrichii on Mount Koma
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[1] A P. weyrichii patch. [2] close-up of flowering shoots. [1/2] On the south slope on July 9 2009. [3] close-up of inflorescences on the south slope on July 20 2011. [4] on December 19 2004, two days after imbibition. Seeds were collected on September 8 2004 by Pecapyu Miyoshi.
References
- Polygonaceae (タデ科)
- Polygonum sachalinense (オオイタドリ)
- Titus, J.H. & Tsuyuzaki, S. 2003. Distribution of plants in relation to microsites on recent volcanic substrates on Mount Koma, Hokkaido, Japan. Ecological Research 18: 91-98
- Tsuyuzaki, S. & Miyoshi, C. 2009. Effects of smoke, heat, darkness and cold stratification on seed germination of 40 species in a cool temperate zone, northern Japan. Plant Biology 11: 369-378