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Key to Mnesithea

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1 Annual; sessile spikelets hemispheric; lower glumes of the sessile spikelet alveolate; [exotic weed]
1 Perennial (cespitose or rhizomatous); sessile spikelets ovate; lower glumes of the sessile spikelet rugose or pitted; [native].
  2 Culms round in cross-section
  2 Culms compressed-keeled in cross-section.
    3 Lower glume with rectangular pits
    3 Lower glume smooth or with transverse ridges.
      4 Lower glume with transverse ridges
      4 Lower glume smooth