Flag leaf - Tomeba (English spelling)

Japanese: 止葉 - とめば(英語表記)flag leaf
Flag leaf - Tomeba (English spelling)
The leaf that grows at the top of the stem of a grass crop. Whether it is the main stem or a tiller, the ear grows above this. The shape of the flag leaf is basically the same as the leaves below it, but the leaf blade is shorter and wider in comparison. The leaf sheath is also long, and because the ear develops within this sheath before it emerges, the leaf sheath gradually swells and exhibits a unique "ear-spreading" state. The number of leaves that form sequentially from the base of the main stem to the flag leaf at the tip is called the main stem leaf number, and in rice, this varies from about 12 to 24, but when a specific variety is cultivated in a specific region, this value is almost constant.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
イネ科農作物の茎の最上位に発生する葉。主茎,分げつを問わず,これより上位に穂が着生する。止葉の形態は基本的にはそれより下の葉位の葉と異なるところはないが,相対的にみれば葉身の長さは短く幅は広い。また葉鞘(ようしよう)長は長く,出穂前の穂はこの葉鞘内で発育するため,葉鞘はしだいにふくれて,特有の〈穂ばらみ〉状態を呈する。主茎の基部から順次形成される葉をたどって,先端の止葉に至るまでの葉数は主茎葉数と呼ばれ,イネではおよそ12~24枚の変異を示すが,特定の品種を特定の地域に栽培した場合には,この値はほぼ一定している。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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