Flora of the Hawaiian Islands
Literature for Oplismenus hirtellus
Wagner et al., 1990, 1999; Lorence & Wagner, 2019.
   Poaceae -- The Grass Family Bibliography
      Oplismenus hirtellus
General Information
DistributionCommon throughout the tropics, but exact area of origin uncertain.
Habit
Perennial; culms decumbent, but flowering culms ascending, 2‒4 dm long, glabrous or scabrous to short pilose, nodes usually densely short pilose.
Leaves
Leaves with glabrous or appressed pubescent sheath, villous on margin, surface sometimes hirsute, collar villous; ligule membranous, 0.6‒0.8 mm long, truncate, margin with setae, 1‒2 mm long; blade thin, lanceolate, usually somewhat asymmetrical at base, 5‒10 cm long, 8‒17 mm wide, adaxial surface very sparsely hispid, abaxial surface hispid or glabrous, apex acuminate.
Flowers
Inflorescences 6‒15 cm long with racemes ascending to appressed, lowest raceme 0.5‒3.5 cm long, rachis scabrous or hispidulous in distal part, sometimes hispid on distal angles. Adjacent spikelet pairs of proximal racemes 0.5‒4 mm apart; glumes ovate, 5‒7-veined, sparsely pilose, apex acute, first glume with an awn 5‒10 mm long, second glume similar to first glume, but with an awn 1‒2 mm long; first lemma similar to second glume, 3‒4 mm long, short awned; first palea, if present, hyaline, 3‒3.5 mm long; second lemma white, ovate-lanceolate, coriaceous, 2.5‒3 mm long, glabrous, glossy, margin enclosing palea, apex acute; second palea white, ovate, coriaceous, 2‒2.5 mm long, glabrous, glossy, apex acute, margin inrolled.
Fruit
Caryopsis ca. 2.5 mm long.
Chromosomes
2n = 54, 60, 72, 90.
Contributor
Nancy Khan