Glossary of Plant Anatomy

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idioblast [PO:0000283; plant anatomy term ]
A native plant cell (PO:0025606) that markedly differs in form, size, or contents from other cells in the same tissue.
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in vitro plant structure [PO:0000004; plant anatomy term ]
A plant structure (PO:0009011) that is grown or maintained in vitro.
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included phloem [PO:0004524; plant anatomy term ]
A portion of secondary phloem tissue produced by included vascular cambium.
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included vascular cambium [PO:0004523; plant anatomy term ]
Cambium occurring within xylem.
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indeterminate nodule [PO:0004538; plant anatomy term ]
A root nodule characterized by a persistent meristem, presence of vascular transfer cells, and cell division in the inner cortex with non-dividing infected cells and bacteria.
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inflorescence [PO:0009049; plant anatomy term ]
A reproductive shoot system (PO:0025082) that has as parts all of the shoot axes (PO:0025029) distal to the most distal foliage leaf (PO:0009025) of a shoot axis and all of the flowers (PO:0009046) borne by those axes. Must have two or more flowers as parts.
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inflorescence apical meristem [PO:0009108; plant anatomy term ]
A reproductive shoot apical meristem that gives rise to the apical growth of the inflorescence. It develops from the shoot apical meristem (SAM) after it undergoes transition from vegetative to reproductive phase.
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inflorescence axis [PO:0020122; plant anatomy term ]
A shoot axis (PO:0025029) that is part of an inflorescence (PO:0009049).
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inflorescence axis internode [PO:0006326; plant anatomy term ]
A shoot axis internode (PO:0005005) that is part of an inflorescence axis (PO:0020122).
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inflorescence bract [PO:0009054; plant anatomy term ]
A bract (PO:0009055) subtending a branch of the inflorescence (PO:0009049) or borne on the inflorescence axis (PO:0020122) below any branch (PO:0025073) or flower (PO:0009046).
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inflorescence bract primordium [PO:0025489; plant anatomy term ]
A bract primordium (PO:0025128) is committed to the development of an inflorescence bract (PO:0009054).
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inflorescence branch [PO:0009081; plant anatomy term ]
An inflorescence axis (PO:0020122) that is a branch (PO:0009081) arising from a first order inflorescence axis (PO:0025104) or from a higher order inflorescence branch.
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inflorescence branch crown [PO:0025134; plant anatomy term ]
A shoot system that forms the basal part of an inflorescence to which the pedicels are attached and in which the internodes do not elongate, giving the appearance of a ridge of raised tissue.
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inflorescence branch meristem [PO:0009105; plant anatomy term ]
An inflorescence meristem (PO:0009108) that gives rise to an inflorescence branch (PO:0009081).
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inflorescence branch pulvinus [PO:0009017; plant anatomy term ]
A pulvinus (PO:0009000) of an inflorescence branch (PO:0009081).
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inflorescence bud [PO:0000057; plant anatomy term ]
A bud that develops into an inflorescence.
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inflorescence meristem [PO:0000230; plant anatomy term ]
A meristem that gives rise to an inflorescence.
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inflorescence node [PO:0006325; plant anatomy term ]
A shoot node that is part of an inflorescence axis and where a spikelet, flower, floret or inflorescence branch is attached.
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inflorescence vascular system [PO:0005028; plant anatomy term ]
A shoot system vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in an inflorescence.
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infructescence [PO:0006342; plant anatomy term ]
A reproductive shoot system (PO:0025082) that develops from an inflorescence (PO:0009049) and has as parts all of the shoot axes (PO:0025029) distal to the most distal foliage leaf (PO:0009025) of a shoot axis and all of the fruits (PO:0009001) borne by those axes.
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infructescence axis [PO:0025242; plant anatomy term ]
A shoot axis (PO:0025029) that is part of an infructescence (PO:0006342).
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infructescence branch [PO:0025243; plant anatomy term ]
An infructescence axis (PO:0025242) that is a branch (PO:0025073) from a primary or higher order infructescence axis.
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initial cell [PO:0004011; plant anatomy term ]
A meristematic cell (PO:0004010) that by division gives rise to two cells, one of which remains meristematic, while the other is added to the plant body.
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inner integument [PO:0020022; plant anatomy term ]
The innermost of the two layers of tissue that usually cover the ovule, contiguous to the nucellus and usually contributing to the formation of the micropyle at the apex.
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inner integument epidermis [PO:0006044; plant anatomy term ]
The epidermis of the inner integument in an ovule.
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integument [PO:0020021; plant anatomy term ]
A portion of plant tissue (PO:0009007) that usually covers a plant ovule (PO:0020003), enveloping a nucellus (PO:0020020) and forming a micropyle (PO:0020025) at the apex.
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integument epidermis [PO:0006043; plant anatomy term ]
A portion epidermis that is part of an integument.
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intercalary meristem [PO:0006073; plant anatomy term ]
A shoot system meristem (PO:0006079) that is intercalated between two portions of non-meristematic tissue and results in an increase in length as part of primary growth.
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intercellular space [PO:0025379; plant anatomy term ]
A plant anatomical space that is part of a portion of plant tissue between two or more cells.
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intercuticular wax [PO:0025389; plant anatomy term ]
A portion of cuticular wax (PO:0025386) that is an amorphous mixture of lipids embedded in the cutin (PO:0025385) of a plant cuticle proper (PO:0025387).
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interfascicular cambium [PO:0006201; plant anatomy term ]
A portion of vascular cambium (PO:00055980) that develops from cells in an interfascicular region (PO:0006202) that is part of a shoot system (PO:0009006).
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interfascicular region [PO:0006202; plant anatomy term ]
A portion of ground tissue located between vascular bundles in a shoot axis.
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intermediary companion cell [PO:0025460; plant anatomy term ]
A companion cell (PO:0000400) that has dense cytoplasm, a small vacuole, proplastids rather than chloroplasts, and abundant and highly branched plasmodesmata linking it to adjacent mesophyll cells.
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internal phloem [PO:0006216; plant anatomy term ]
A portion of primary phloem tissue positioned internal to the primary xylem.
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involucral bract [PO:0009045; plant anatomy term ]
Equals inflorescence bract of an involucre, as in Asteraceae or Compositeae.
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involucre [PO:0009100; plant anatomy term ]
A collective phyllome structure composed of two or more involucral bracts at the base of a cluster of flowers, as found in Asteraceae or Compositae.
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