Flora of the Hawaiian Islands
Monocotyledon Literature for Polypogon interruptus
Wagner et al., 1990, 1999.
   Poaceae -- The Grass Family Bibliography
      Polypogon interruptus

Common name(s): beardgrass, ditch polypogon
General Information
DistributionNative to South America.In the Hawaiian Islands, naturalized on Kure, Midway, Kaua`i, O`ahu, Maui, Hawai`i.

Perennials; culms tufted, 0.5-6(-9) dm tall, sometimes decumbent at base and rooting at nodes.
Sheaths smooth to scaberulous, margins overlapping, thin; ligule translucent, firm, (1.5-)3-7(-9.5) mm long, nerved, puberulent, margins entire to lacerate, apex narrowed, obtuse, or truncate; blades flat, 2-5(-9) mm wide, scabrous.
Panicles 2-9(-15) cm long, interrupted, branches erect; glumes subequal, 1.7-2.5 mm long, keeled, hispidulous, apex narrowed abruptly into a terminal awn, sometimes minutely bifid, the awn (1-)1.5-3(-5) mm long; lemma narrowly lanceolate, (0.7-)1-1.5 mm long, smooth, glossy, apex minutely bifid, awned from near apex, the awn ca. 3 mm long; palea similar and nearly as long as lemma.
Caryopsis pale brown, narrowly ovoid, 0.6-0.8 mm long.
2n = 28, 42