Leersia sayanuka Ohwi

This species is very close to Leersia oryzoides and is not completely distinct from it. It can usually be recognized by its longer, less conspicuously hispid spikelets. Leersia sayanuka is not known to produce panicles with cleistogamous spikelets in the leaf axils.

Perennial, tufted, with rhizomes. Culms ascending, 30–70 cm tall, nodes retrorsely hispid. Leaf sheaths retrorsely spinulose; ligule 1–2 mm, truncate; leaf blades grayish green, 7–10(–20) × 0.5–1 cm, margins scabrid; ligule ca. 0.5 mm, truncate. Panicle lax, ovate in outline, up to 20 cm, base often enclosed in terminal leaf sheath; branches inserted singly, spreading, up to 10 cm, slenderly triquetrous, scabrid, branched or not, lower part long naked. Spikelets narrowly oblong, 6–8 mm, pale green, whitish along keel; lemma hispid on keel, surface sparsely hispidulous, apex abruptly contracted, obtuse. Stamens 3(or 2), anthers 1–2 mm. Fl. and fr. autumn.

Forests, streamsides, lake shores, moist grassy places. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hubei, Jiangsu, Shandong, Zhejiang [Japan, Korea].

Homalocenchrus oryzoides (Linnaeus) Haller var. japoni-cus (Hackel) Honda; Leersia hackelii Keng; L. oryzoides (Linnaeus) Swartz var. japonica Hackel; L. oryzoides subsp. japoni-ca (Hackel) T. Koyama.

Leersia sayanuka là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Ohwi mô tả khoa học đầu tiên năm 1938.

秕壳草（学名：Leersia sayanuka）为禾本科假稻属下的一个种。