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| Spike |
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Unbranched inflorescence in which the spikelets are sessile on the rachis (main axis). |
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| Spikelike |
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Basic unit of a grass inflorescence, typically consisting of two glumes (except in some species where one or both glumes are lacking), one or more florets, and a rachilla. |
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| Spicate Branches |
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Spikelike; resembling a spike inflorescence but having both sessile and pedicellate spikelets or flowers. |
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| Panicle |
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Inflorescence type in which the central axis branches and rebranches. |
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| Raceme |
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Inflorescence type in which all the spikelets are pedicellate on the rachis. |
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| Images and definitions (Hatch, S.L., J.L. Schuster, and R.L. Drawe. 1999. Grasses of the Texas Gulf Prairies and Marshes. Texas A&M University Press, College Station, Texas 77843). |
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