Polygonum indica - Polygonum indica

Japanese: イヌタデ - いぬたで
Polygonum indica - Polygonum indica

An annual plant of the Polygonaceae family (APG classification: Polygonaceae). The stem is erect or ascending, 20-50 cm tall, cylindrical, and usually reddish purple. The leaves are alternate, broadly lanceolate or lanceolate, pointed at the tip, and hairy on the margins and underside of the veins. The leaf sheaths are tubular with equal length hair margins. The flowering season is from June to October, and the branches produce spikes 2-5 cm long with reddish purple, or rarely white, small flowers. The perianth has five petals, obovate, and about 1.5 mm long. There are usually eight stamens, three styles, and the achene is dark brown, triangular, about 1.5 mm long, glossy, and wrapped in the persistent perianth. It is commonly seen on roadsides in the wilderness from Hokkaido to Kyushu, and is also widely distributed in Korea, China, Southeast Asia, etc. Another name for it, Akamamma, means "red rice," and it comes from the fact that the granular safflower resembles red rice and is used by children as a pretend meal.

[Junko Kobayashi December 11, 2020]

Polygonum candida
The stems are erect or obliquely upward, and the leaves are broad lanceolate or lanceolate. From June to October, it produces spike-like flowers at the ends of the branches, and bears small crimson-purple flowers. Also known as Akamanma ©Shogakukan Photo by Masatoshi Hirose ">

Polygonum candida

Polygonum gracilis flower
The flower spike is 2-5cm long, with 5 perianths, each about 1.5mm long. Occasionally produces small white flowers. ©Seishohmaru ">

Polygonum gracilis flower

Major species of Polygonum (specimen illustration)
©Kanzo Otawa ">

Major species of Polygonum (specimen illustration)


Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

タデ科(APG分類:タデ科)の一年草。茎は直立または斜上し、高さ20~50センチメートル、円柱形で普通は紅紫色を帯びる。葉は互生し、広披針(こうひしん)形または披針形で先端がとがり、縁(へり)と裏面脈上に毛がある。葉鞘(ようしょう)は筒状で等長の縁毛がある。花期は6~10月で、枝の先に長さ2~5センチメートルの穂状花穂をつくり、紅紫色、まれに白色の小花をつける。花被(かひ)は5枚で倒卵形、長さ約1.5ミリメートル。雄しべは普通8本、花柱は3本、痩果(そうか)は暗褐色の三稜(さんりょう)形で長さ約1.5ミリメートル、光沢があり、宿存する花被に包まれる。北海道から九州にかけての原野の道端に普通にみられ、また、朝鮮、中国、東南アジアなどに広く分布する。別名のアカマンマは「赤の飯」のことで、粒状の紅花を赤飯に見立て、幼児のままごとに使われることからいう。

[小林純子 2020年12月11日]

イヌタデ
茎は直立または斜上し、葉は広披針形または披針形。6~10月、枝先に穂状花穂をつくり、紅紫色の小花をつける。別名アカマンマ©Shogakukan 撮影/広瀬雅敏">

イヌタデ

イヌタデの花
花穂の長さ2~5cm、花被は5枚で長さ約1.5mm。まれに白色の小花をつける©Seishohmaru">

イヌタデの花

タデのおもな種類〔標本画〕
©大多和鐘三">

タデのおもな種類〔標本画〕


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