Glossary of Plant Anatomy

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unicellular plant gametangium [PO:0025521; plant anatomy term ]
A native plant cell (PO:0025606) that produces one or more gametes (PO:0025006) and participates in the gametophyte development stage (PO:0028003).
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unicellular trichome [PO:0025537; plant anatomy term ]
A trichome (PO:0000282) that is a single plant cell (PO:0009002).
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unifacial vascular leaf [PO:0025328; plant anatomy term ]
A vascular leaf that has increased activity of either the adaxial or abaxial meristem early in development, leading to absence of the opposite surface on the mature leaf.
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upper floret of pedicellate spikelet of ear [PO:0006350; plant anatomy term ]
An ear floret that is the upper of the two florets of a pedicellate spikelet rachilla of an ear inflorescence.
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upper floret of pedicellate spikelet of tassel [PO:0006314; plant anatomy term ]
A tassel floret that is one of the two florets placed above the lower floret on a pedicellate spikelet rachilla of a tassel inflorescence.
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upper floret of sessile spikelet of ear [PO:0006352; plant anatomy term ]
An ear floret that is one of the two florets placed above the lower floret on a sessile spikelet rachilla of an ear inflorescence.
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upper floret of sessile spikelet of tassel [PO:0006316; plant anatomy term ]
A tassel floret that is one of the two florets placed above the lower floret on a sessile spikelet rachilla of a tassel inflorescence.
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upper glume [PO:0006004; plant anatomy term ]
A glume that is the apical/distal of the two glumes subtending a pair of florets.
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upper glume of ear spikelet [PO:0006371; plant anatomy term ]
An upper glume that is part of an ear spikelet.
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upper glume of pedicellate spikelet of ear [PO:0006439; plant anatomy term ]
An upper glume of ear spikelet that is part of an ear pedicellate spikelet.
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upper glume of pedicellate spikelet of tassel [PO:0006388; plant anatomy term ]
An upper glume of tassel spikelet that is part of a tassel pedicellate spikelet.
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upper glume of sessile spikelet of ear [PO:0006440; plant anatomy term ]
An upper glume of ear spikelet that is part of an ear sessile spikelet.
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upper glume of sessile spikelet of tassel [PO:0006387; plant anatomy term ]
An upper glume of tassel spikelet that is part of a tassel sessile spikelet.
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upper glume of tassel spikelet [PO:0006370; plant anatomy term ]
An upper glume that is part of a tassel spikelet.
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upright ray secondary xylem parenchyma cell [PO:0004528; plant anatomy term ]
A ray secondary xylem parenchyma cell (PO:0004527) that is oriented with its longest dimension parallel to the plant axis (PO:0025004) in which it is found.
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