Aquatic perennials; culm decumbent and rooting at base, upper parts floating on water, soft, often 1
cm in diam., flowering culm as much as 1 m tall. Blade 10-30 cm long, 8-16 mm wide; sheath glabrous,
longer than internode; ligule a ring of hairs, ca. 2 mm long. Panicle open, partially included in upper
most sheath, 15-30 cm long, spikelets oblong-lanceolate, ca. 4 mm long, acuminate; lower glume hyaline,
acute to truncate, ca. 1 mm long, veins obscure; upper glume and lower lemma equal or subequal,
7-9-veined; lower lemma enclosing a hyaline lower palea of ca. 2/3 length of lower lemma; upper
lemma ca. 2.5 mm long, smooth and shiny, indurate, pale at maturity.
ILAN: Chiaochi, Hsu 831. TAIPEI: Chinshan, Hsu 1302; Kankou, Hsu 653. HSINCHU: Nanliao, Chuang
2548. TAICHUNG: Tachia, Asikaga 7076. NANTOU: Puli, Hsu 1377. YUNLIN: Mailiao, Suzuki 6608. TAINAN:
Hsinhua, Hsu 715. PINGTUNG: Hengchun, Hsu 506.
Tropical Asia and Australia. Taiwan, in shallow water on margins of ponds.
leaf surface 表面: (nod)nodules on both surfaces
sclerenchyma 厚壁組織: (boscl)(bostr)on both sides of veins as strand or girder
chlorenchyma 葉綠組織: (radia)cells radiate and lesser than bundle sheath cell in width
bundle sheath 維管束鞘: (dko)two bundle sheaths the outer one with conspicuous chloroplast
buliform cells well developed 泡狀細胞發達: mainly appear in adaxial side
no small vein under buliform cells泡狀細胞下無小脈: (bcfan)bulliform cell with colorless cells extend beneath it
chlorenchyma cell number between two adjacent veins: 2
chloroplast form in bundle sheath 束鞘細胞內之葉綠體型式: (per)large amount and in peripheral site
mestome sheath 內束鞘細胞: (Xyms+)metaxylem pole adjacent with mestome sheath