Ooketade - Ooketade

Japanese: オオケタデ - おおけたで
Ooketade - Ooketade

A large annual plant of the Polygonaceae family (APG classification: Polygonaceae). It is covered with white soft hairs. The stem is erect and well-branched, reaching a height of 2 meters. The leaves are alternate, 10-20 cm long, 7-15 cm wide, broadly ovate with a sharp tip, heart-shaped at the base, and long stalks. The sheaths are tubular, membranous, hairy, and green at the edges. They flower from August to October, with dense spikes at the end of each branch, and hang down. The perianth is red, has 5 lobes, and is 3.5 mm long. The achene is oblate, about 3 mm long, and not shiny. Native to Southeast Asia, it is cultivated for ornamental purposes in Japan. The leaves are said to have the effect of neutralizing the poison of vipers, hence the name Habute Cobra.

[Junko Kobayashi December 11, 2020]

Polygonum multiflorum
The leaves are broadly ovate with a heart-shaped base. From August to October, dense spikes of flowers hang down from the end of each branch. The perianth is red. ©Shogakukan Photo by Okuyama Hisashi ">

Polygonum multiflorum

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)の大形の一年草。全体に白い軟毛がある。茎は直立し、よく分枝して高さ2メートルに達する。葉は互生し、長さ10~20センチメートル、幅7~15センチメートル、広卵形で先は鋭くとがり、基部は心臓形で柄は長い。鞘(さや)は筒状、膜質で毛があり、辺縁は緑色で広がる。花は8~10月、各分枝の先に密な穂状花序をつけて下垂する。花被(かひ)は紅色で5裂し、長さ3.5ミリメートル。痩果(そうか)は扁円(へんえん)形で約3ミリメートル、光沢はない。東南アジア原産で、日本では観賞用に栽培する。葉はマムシの毒を消す作用があるといわれ、ハブテコブラの名がある。

[小林純子 2020年12月11日]

オオケタデ
葉は広卵形で、基部は心臓形。8~10月、各分枝の先に密な穂状花序をつけ、下垂する。花被は紅色©Shogakukan 撮影/おくやまひさし">

オオケタデ

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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