Isachne firma sensu Hayata, l. c. 7: 57. 1918; Honda, l. c. 279. 1930.
Isachne schmidii Hack., Bot. Tidsskrift 24: 97. 1901; Ohwi, Fl. Jap. 151. 1956.
Isachne commelinifolia Warb., Ohwi, l. c. 11: 55. 1942.
Culm long creeping, flowering branches 10-20 cm tall. Blade lanceolate to ovate-lanceolate, 1.5-3 cm long by 7-9 mm wide, base cordate, margins prominently thickened; sheath margins ciliate, slightly shorter than the internode; ligule a ring of hairs, about 1.5 mm long. Panicle 3-4 cm long, stout; pedicel clavate at the apex. Spikelets elliptical, grayish-green, obtuse, 2-2.3 mm long; glumes similar, rigid-hispid, ovate, exceeding the floret, subequal; lower glume slightly longer, convexed, 9-11-nerved, nerves scabrous. Florets similar, ovate or elliptical, obtuse, 1/4 to 1/3 as long as the glumes, glabrous or the lemmas slightly hispid on the inrolled margins; anther about 1 mm long.
TAIPEI: Chihsinshan, Hsu 5081; Kankou, Sasaki s. n. Nov. 1932*. ILAN: Suao, Masamune s. n. Apr. 27, 1938.
TAITUNG: Hsinkang, Suzuki 19748; Tsusueipo, Hsu 3436. HUALIEN: Yuli, Suzuki 19788.
Distributed in swampy grounds in mountain regions in South India, Ceylon and Southeast Asia generally.
Locally this species is found in moist ground at low elevations along forest margins.
leaf surface 表面: (sha)upper surface with shallow notch between the veins
sclerenchyma 厚壁組織: (boscl)(bostr)on both sides of veins as strand or girder
chlorenchyma 葉綠組織: (isach)cells elongate and radiate upward like crab legs
bundle sheath 維管束鞘: (nks)bundle sheaths with small amount of chloroplast
buliform cells not well developed 泡狀細胞不發達: (smreg)epidermal cells gradually enlarge from vein to intervein
chlorenchyma cell number between two adjacent veins: 10
chloroplast form in bundle sheath 束鞘細胞內之葉綠體型式: (lit)with a little of chloroplast
mestome sheath 內束鞘細胞: (Xyms+)metaxylem pole adjacent with mestome sheath
distance between two adjancent vein 脈間距: 240 micrometer
length/weidth ratio of bundle sheath in LS 束鞘細胞縱面長寬比: 4
chlorenchyma cell shape in LS 葉綠細胞縱面形狀: non -lobed