PO:0025004 plant axis An axial plant organ (PO:0009008). PO:0025131 plant anatomical entity An anatomical entity that is or was part of a plant. PO:0000019 gynoecium primordium A floral structure primordium (PO:0025477) that is committed to the development of a gynoecium (PO:0009062). PO:0000018 ovule primordium A floral structure primordium (PO:0025477) that is committed to the development of an ovule (PO:0020003). PO:0009025 vascular leaf A leaf (PO:0025034) in a vascular plant. PO:0025338 collective plant organ structure development stage A plant structure development stage (PO:0009012) that has as primary participant a collective plant structure (PO:0025497). PO:0008028 reproductive shoot apical meristem A shoot apical meristem (PO:0020148) that gives rise to the apical growth of reproductive tissues and organs. PO:0000225 peripheral zone A portion of meristem tissue (PO:0009013) which is the organogenic region of the meristem, characterized by higher rates of cell division. obsolete_plant_structure_development_stage obsolete_plant_structure_development_stage PO:0025099 embryo plant structure A plant structure (PO:0009011) that is part of an plant embryo (PO:0009009). PO:0005043 secondary phloem A portion of phloem (PO:0005417) tissue that develops from a vascular cambium (PO:0005598). PO:0025066 stalk A cardinal organ part (PO:0025001) that is elongated and sub-cylindrical to cylindrical and supports another cardinal organ part. PO:0006005 carpel anlagen A phyllome anlagen (PO:0025430) that will give rise to a carpel primordium (PO:0004703) and is part of a peripheral zone (PO:000225) of a flower meristem (PO:0000229). PO:0009015 portion of vascular tissue A portion of plant tissue (PO:0009007) that has as part one or more tracheary elements (PO:0000290) or sieve elements (PO:0025406). PO:0004010 meristematic cell A native plant cell (PO:0025606) synthesizing protoplasm and producing new cells by division and with only a primary cell wall. obsolete_plant_anatomy obsolete_plant_anatomy PO:0008016 vegetative shoot apical meristem A shoot apical meristem (PO:0020148) that gives rise to the apical growth of vegetative tissues and organs. PO:0025530 reproductive shoot system development stage A shoot system development stage (PO:0025527) that has as primary participant a reproductive shoot system (PO:0025082). PO:0005597 cambium A lateral meristem (PO:0020145) that has as part a single layer of cambial initial cells (PO:0000295) and their derivatives, arranged orderly in radial files. PO:0009026 sporophyll A leaf-like organ on which one or more sporangia are borne. PO:0009046 flower A determinate reproductive shoot system (PO:0025082) that has as part at least one carpel (PO:0009030) or at least one stamen (PO:0009029) and does not contain any other determinate shoot system (PO:0009006) as a part. PO:0005598 vascular cambium A cambium (PO:0005597) that is located between and gives rise to secondary xylem (PO:0005848) and secondary phloem (PO:0005043). PO:0020003 plant ovule A plant organ (PO:0009008) that has as parts a nucellus (PO:0020020) in which a female gametophyte (PO:0025279) is located, one or two integuments (PO:0020021), and a funicle (PO:0020006). PO:0000035 cotyledon vascular system A vascular system that is part of a cotyledon. PO:0020148 shoot apical meristem A shoot system meristem (PO:0006079) formed at the apex of the shoot axis (PO:0025029), including those originating from an axillary bud meristem (PO:0000232). PO:0000349 epidermal initial cell An initial cell (PO:0004011) that is part of an epidermis (PO:0005679) and gives rise to specialized cell types of the epidermis. PO:0009088 seed coat A portion of plant tissue that is the covering of a seed derived from ovular - mainly integumentary - tissue. PO:0025395 floral organ A plant organ (PO:0009008) that is part of a flower (PO:0009046). PO:0009001 fruit A multi-tissue plant structure (PO:0025496) that develops from a gynoecium (PO:0009062) and may have as parts one or more seeds (PO:0009010). PO:0025233 portion of embryo plant tissue A portion of plant tissue that is part of a plant embryo. PO:0025202 microsporangium A sporangium (PO:0025094) in which microspores (PO:0020048) are produced. PO:0025222 reproductive shoot apex A shoot apex that has as part a reproductive shoot apical meristem. PO:0009073 stigma A cardinal organ part that is part of a carpel or group of fused carpels on which the pollen germinates, usually apical. PO:0025513 organ lamina A lamina (PO:0025060) that is part of a plant organ (PO:0009008). PO:0025029 shoot axis A plant axis (PO:0025004) that is part of a shoot system (PO:0009006). PO:0020145 lateral meristem A portion of meristem (PO:0009013) tissue located parallel to the sides of a shoot axis (PO:0025029) or root (PO:0009005) that participates in lateral growth. PO:0020144 apical meristem A maximal portion of meristem tissue (PO:0009013) located at a shoot apex (PO:0000037) or root tip (PO:0000025). PO:0005017 flower vascular system A shoot system vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a flower. PO:0025127 primordium A portion of meristem tissue (PO:0009013) that has as parts protoderm (PO:0006210) and sub-epidermal meristematic tissue and is committed to the development of a particular plant structure (PO:0009011). PO:0025023 collective phyllome structure A collective plant organ structure (PO:0025007) that consists of two or more phyllomes (PO:0006001) originating from the same node or from one or more adjacent nodes with compressed shoot internodes (PO:0005005). PO:0008012 stigma vascular system A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a stigma. all all This term is the most general term possible PO:0003011 root vascular system A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a root. PO:0005018 stamen vascular system A phyllome vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a stamen. PO:0030051 central strand A portion of plant tissue that is an axial strand in the center of a gametophore axis or seta and has as part a hydrome or a leptome. PO:0025409 secondary vascular tissue A portion of vascular tissue (PO:0009015) that develops from a vascular cambium (PO:0005598). PO:0009027 megasporophyll A structure upon which (or in the axil of which) one or more megasporangia are borne; in flowering plants, a carpel. PO:0005019 carpel vascular system A phyllome vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a carpel. PO:0006001 phyllome A lateral plant organ (PO:0009008) produced by a shoot apical meristem (PO:0020148). PO:0004703 carpel primordium A phyllome primordium (PO:0025128) that develops from a carpel anlagen (PO:0006005) and is committed to the development of a carpel (PO:0009030). PO:0008013 anther vascular system A phyllome vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a anther. PO:0009086 endocarp A portion of plant tissue (PO:0009007) that is the innermost differentiated layer of a pericarp (PO:0009084). PO:0004011 initial cell 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. PO:0008003 fruit vascular system A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a fruit. PO:0025060 lamina A cardinal part of multi-tissue plant structure (PO:0025498) that is thin and flat. PO:0020048 microspore The smaller, in general, of the two kinds of spores produced after meiosis in the life cycle of a heterosporous plant, and on germination giving rise to the male gametophyte. PO:0005679 epidermis A portion of plant tissue (PO:0009007) composed of epidermal cells (PO:0004013) that develops from the protoderm (PO:0006210) and covers the surface of a plant structure (PO:0009011). PO:0030056 archesporial cell A native plant cell (PO:0025606) that divides to gives rise to a sporocyte (PO:0006204) and is part of a sporangium (PO:0025094). PO:0025082 reproductive shoot system A shoot system (PO:0009006) in the sporophytic phase that has as part at least one sporangium (PO:0025094). PO:0025527 shoot system development stage A collective plant organ structure development stage (PO:0025338) that begins with the onset of the plant organ development stage (PO:0025339) and ends with either gametophyte senescent stage (PO:0025343) or sporophyte senescent stage (PO:0007017) or death. PO:0006014 male archesporial cell An archesporial cell (PO:0030056) that is part of a microsporangium (PO:0025202) and divides to gives rise to a microsporocyte (PO:0020047). PO:0005417 phloem A portion of vascular tissue (PO:0009015) that has as parts sieve elements (PO:0025406). PO:0009084 pericarp A portion of plant tissue (PO:0009007) that is the outer layer (wall) of a fruit (PO:0009001), and develops from a plant ovary (PO:0009072) or a carpel (PO:0009030) wall. PO:0006210 protoderm A portion of meristem tissue (PO:0009013) that is the outer layer of an apical meristem (PO:0020144), or the outer layer of a plant embryo proper (PO:0000001), and gives rise to a portion of epidermis (PO:0005679). PO:0000034 vascular system A maximal portion of vascular tissue (PO:0009015) in a whole plant (PO:0000003), collective plant structure (PO:0025497), multi-tissue plant structure (PO:0025496), or cardinal part of multi-tissue plant structure (PO:0025498). PO:0025001 cardinal organ part A cardinal part of multi-tissue plant structure (PO:0025498) that is a proper part of a plant organ (PO:0009008) and includes portions of plant tissue (PO:0009007) of at least two different types. PO:0000017 vascular leaf primordium A phyllome primordium (PO:0025128) that develops from a vascular leaf anlagen (PO:0025431) and is part of a vegetative shoot apex (PO:0025223) and is committed to the development of a vascular leaf (PO:0009025). PO:0025128 phyllome primordium A primordium (PO:0025127) that develops from a phyllome anlagen (PO:0025430) and is part of a shoot apex (PO:0000037) and is committed to the development of a phyllome (PO:0006001). PO:0025478 androecium primordium A floral structure primordium (PO:0025477) that is committed to the development of an androecium (PO:0009061). PO:0000282 trichome A unicellular or multicellular plant structure (PO:0009011) that forms a non-sclerified outgrowth from the epidermis (PO:0005679). PO:0009011 plant structure An anatomical structure that is or was part of a plant, or was derived from a part of a plant. PO:0009067 filament A stalk that is part of a stamen. PO:0008015 hypocotyl vascular system Vascular system of the hypocotyl. PO:0009002 plant cell A cell which is a plant structure (PO:0009011). PO:0000052 petiole vascular system A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a leaf petiole. PO:0009009 plant embryo A whole plant (PO:0000003) that participates in the plant embryo stage (PO:0007631). PO:0009010 seed A multi-tissue plant structure (PO:0025496) that develops from a plant ovule (PO:0020003) and has as parts a plant embryo (PO:0009009) enclosed in a seed coat (PO:0009088). PO:0008014 filament vascular system A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a filament. PO:0025430 phyllome anlagen A portion of meristem tissue (PO:0009013) that is part of a peripheral zone (PO:0000225) of a shoot apical meristem (PO:0020148) and will give rise to a phyllome primordium (PO:0025128). PO:0025496 multi-tissue plant structure A plant structure (PO:0009011) that has as parts two or more portions of plant tissue (PO:0009007) of at least two different types and which through specific morphogenetic processes forms a single structural unit demarcated by primarily bona-fide boundaries from other structural units of different types. PO:0009007 portion of plant tissue A plant structure (PO:0009011) that consists predominantly of similarly specialized plant cells (PO:0009002) of one or more types. PO:0006204 sporocyte A native plant cell (PO:0025606) which is diploid (2n), and undergoes meiosis (GO:0007126) to produce four haploid (1n) plant spores (PO:0025017). PO:0025497 collective plant structure A plant structure (PO:0009011) that is a proper part of a whole plant (PO:0000003) and includes two or more adjacent plant organs (PO:0009008) or adjacent cardinal organ parts (PO:0025001), along with any associated portions of plant tissue (PO:0009007). PO:0009028 microsporophyll A structure on which one or more microsporangia are borne; in flowering plants, the stamen. PO:0006079 shoot system meristem A portion of meristem tissue (PO:0009013) that is part of a shoot system (PO:0009006). PO:0025337 life of whole plant stage A maximal whole plant development stage. PO:0025498 cardinal part of multi-tissue plant structure A plant structure (PO:0009011) that is a proper part of a multi-tissue plant structure (PO:0025496) and includes portions of plant tissues (PO:0009007) of at least two different types. PO:0025094 sporangium A plant organ (PO:0009008) in which plant spores (PO:0025017) are produced. PO:0004518 bark All tissues outside the vascular cambium or the xylem; in older trees may be divided into dead outer bark and living inner bark, which consists of secondary phloem. PO:0000032 tetrad of microspores A portion of plant tissue consisting of four microspores that remained joined together shortly after meiosis. Each cell will give rise to a male gametophyte. PO:0009006 shoot system A collective plant organ structure (PO:0025007) that produces shoot-borne portions of meristem tissue (PO:0009013) and the plant structures (PO:0009011) that arise from them. PO:0025223 vegetative shoot apex A shoot apex PO:0000037) that has as part a vegetative shoot apical meristem (PO:0008016). PO:0025431 vascular leaf anlagen A phyllome anlagen (PO:0025430) that will give rise to a vascular leaf primordium (PO:0000017) and is part of a peripheral zone (PO:0000225) of a shoot apical meristem (PO:0020148). PO:0009013 portion of meristem tissue A portion of plant tissue (PO:0009007) in which plant cells (PO:0009002) have retained their embryonic characteristics, or have reverted to them secondarily, and that divide to produce new cells that can undergo differentiation to form mature tissues, i.e. they have a capacity for morphogenesis and growth. PO:0025206 phyllome vascular system A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a phyllome. PO:0025007 collective plant organ structure A collective plant structure (PO:0025497) that is a proper part of a whole plant (PO:0000003), and is composed of two or more adjacent plant organs (PO:0009008) and the associated portions of plant tissue (PO:0009007). PO:0009062 gynoecium A collective phyllome structure (PO:0025023) composed all of the carpels (PO:0009030) in a flower (PO:0009046). PO:0025017 plant spore A whole plant (PO:0000003) that arises through meiosis and is contained in a spore wall. PO:0004705 stamen primordium A phyllome primordium (PO:0025128) that develops from a stamen anlagen (PO:0025486) and is committed to the development of a stamen (PO:0009029). PO:0000229 flower meristem A portion of reproductive shoot apical meristem tissue (PO:0008028) that gives rise to the floral organs (PO:0025395). PO:0008047 scutellar vascular system A vascular system in a scutellum. PO:0025486 stamen anlagen A phyllome anlagen (PO:0025430) that will give rise to a stamen primordium (PO:0004705) and is part of a peripheral zone (PO:000225) of a flower meristem (PO:0000229). PO:0000036 leaf vascular system A phyllome vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a leaf. PO:0025205 shoot system vascular system A vascular system that is part of a shoot system. PO:0025606 native plant cell A plant cell (PO:0009002) that is either part of a multicellular whole plant (PO:0000003) 'in vivo' or a unicellular organism 'in natura' (i.e. part of a natural environment). PO:0007033 whole plant development stage A plant structure development stage (PO:0009012) that has as primary participant a whole plant (PO:0000003). PO:0025396 phyllome lamina An organ lamina (PO:0025513) that is part of a phyllome (PO:0006001). PO:0020039 leaf lamina A phyllome lamina (PO:0025396) that is the part of a leaf (PO:0025034) exclusive of the petiole (PO:0020038) or leaf sheath (PO:0020104), if either is present. PO:0009029 stamen A microsporophyll bearing one or more microsporangia. PO:0000003 whole plant A plant structure (PO:0005679) which is a whole organism. PO:0028002 sporophyte development stage A whole plant development stage (PO:0007033) that has as primary participant a whole plant (PO:0000003) during the interval between fertilization (or apogamy) and death. PO:0000039 shoot axis vascular system A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a shoot axis. PO:0025549 trichome tip A plant structure (PO:0009011) that is the apical most portion of a trichome apex (PO:0025550). PO:0025550 trichome apex A plant structure (PO:0009011) that is the apical most portion of a trichome (PO:0000282). PO:0020047 microsporocyte A sporocyte (PO:0006204) that produces four haploid (1n) microspores (PO:0020048). PO:0000037 shoot apex A shoot axis (PO:0025029) that is the most distal part of a shoot system (PO:0009006) and has as parts a shoot apical meristem (PO:0020148) and the youngest primordia (PO:0025127). PO:0009012 plant structure development stage A stage in the life of a plant structure (PO:0009011) during which the plant structure undergoes developmental processes. PO:0025477 floral organ primordium A primordium (PO:0025127) that is committed to the development of a floral organ (PO:0025395) and is part of a reproductive shoot apex (PO:0025222). PO:0009030 carpel A megasporophyll, almost always at the center of a flower, its margins more or less fused together or with other carpels to enclose the ovule(s). PO:0025034 leaf A phyllome (PO:0006001) that is not associated with a reproductive structure. PO:0025423 plant tissue development stage A plant structure development stage (PO:0009012) that has as primary participant a portion of plant tissue (PO:0009007). PO:0006088 primary sporogenous cell A native plant cell (PO:0025606) is formed by the division of the male archesporial initial. After several mitotic divisions these cells differentiate into pollen mother cells. PO:0009008 plant organ A multi-tissue plant structure (PO:0025496) that is a functional unit, is a proper part of a whole plant (PO:0000003), and includes portions of plant tissue (PO:0009007) of at least two different types that derive from a common developmental path. PO:0009061 androecium A collective phyllome structure (PO:0025023) composed all of the stamens (PO:0009029) in a flower (PO:0009046). PO:0008011 embryo vascular system Vascular system of embryo. PO:0000048 leaf lamina vascular system A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a leaf lamina.