grasses, widely creeping or floating, culms succulent, stoloniferous, 50-200 cm
long, herbaceous, spongy at base, internodes solid. Leaf-blades linear or
broadly linear, ligules membranous. Inflorescence usually a cylindrical
spikelike panicle, with densely flowered branches. Spikelets narrowly
lanceolate, 2-flowered, disarticulating, pedicel apices truncate or discoid.
Glumes 2, very unequal, lower glume short, separated from second glume, 1-3
nerved, upper glume and lemma of lower floret larger and longer than lemma of
perfect floret, palea tip not enclosed. Paleas awnless. Lodicules 2, fleshy,
glabrous. Stamens 3. Caryopsis free.