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Key to Zea

Poaceae

Zea

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1 Pistillate spikelets (kernels) borne on a spongy rachis (cob) in rows, 60-1000 per cob
1 Pistillate spikelets embedded in a hardened rachis, 4-15 per cob.
  2 Perennial from creeping rhizomes
  2 Annual.