Flora of the Hawaiian Islands
Monocotyledon Literature for Juncus planifolius
Wagner et al., 1990, 1999.
   Juncaceae -- The Rush Family Bibliography
      Juncus planifolius
General Information
DistributionNative to South America, New Zealand, and Australia, naturalized in Europe.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i.

Juncaceae - Juncus planifolius

Perennial herbs; stems 1-3 dm long, cespitose.
Leaves numerous, basal, much shorter than stems, flat, grass-like, with flattened side toward stem, margins of sheaths hyaline, not prolonged into auricles.
Flowers in 2 to numerous glomerules on strict branches, forming umbellately branched cymes, lowest bract usually not extending more than 1/3 length of inflorescence; inner perianth parts with 2 dark purplish lines, ca. 2 mm long, longer than outer ones, margins inflexed, apex obtuse, outer perianth parts uniformly dark; stamens 3; filaments at least 3 times longer than anthers.
Capsules obovoid, trigonous, mucronate, longer than to equalling perianth, often transversely wrinkled.
Seeds pale brown, shiny, ovoid, ca. 4 mm long, minutely reticulate.