part_of
type: ObjectProperty
type: TransitiveProperty

has_part
type: ObjectProperty
type: TransitiveProperty

develops_from
type: ObjectProperty
type: TransitiveProperty

whole plant
type: Class
subclass of: plant structure
IAO_0000115: A plant structure (PO:0005679) which is a whole organism.
has broad synonym: genet
has broad synonym: ramet
has exact synonym: planta entera (Spanish)
has exact synonym: 植物体全体 (Japanese)
has narrow synonym: bush
has narrow synonym: frutex
has narrow synonym: frutices
has narrow synonym: gametophyte
has narrow synonym: herb
has narrow synonym: liana
has narrow synonym: prothalli
has narrow synonym: prothallium
has narrow synonym: prothallus
has narrow synonym: seedling
has narrow synonym: shrub
has narrow synonym: sporophyte
has narrow synonym: suffrutex
has narrow synonym: suffrutices
has narrow synonym: tree
has narrow synonym: vine
has narrow synonym: woody clump
has related synonym: clonal colony
has related synonym: colony

cotyledon primordium
type: Class
subclass of: phyllome primordium
subclass of: Restriction
  on property: part_of
  some values from: vegetative shoot apex
subclass of: Restriction
  on property: develops_from
  some values from: cotyledon anlagen
IAO_0000115: A phyllome primordium (PO:0025128) that develops from a cotyledon anlagen (PO:0025432) and is part of a vegetative shoot apex (PO:0025223) and is committed to the development of a cotyledon (PO:0020030).
has exact synonym: cotyledon primordia
has exact synonym: portion of cotyledon primordium tissue
has exact synonym: primordio de cotiled&#243n (Spanish)
has exact synonym: 子葉原基（可視的） (Japanese)

vascular leaf primordium
type: Class
subclass of: phyllome primordium
subclass of: Restriction
  on property: part_of
  some values from: vegetative shoot apex
subclass of: Restriction
  on property: develops_from
  some values from: vascular leaf anlagen
IAO_0000115: 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).
has exact synonym: leaf primordium
has exact synonym: portion of vascular leaf primordium tissue
has exact synonym: primordio de hoja (Spanish)
has exact synonym: vascular leaf primordia
has exact synonym: 葉原基 (Japanese)

vascular system
type: Class
subclass of: portion of plant tissue
subclass of: Restriction
  on property: part_of
  some values from: whole plant
disjoint with: plant cell
disjoint with: plant organ
disjoint with: cardinal organ part
disjoint with: collective plant organ structure
IAO_0000115: 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).
has exact synonym: sistema vascular (Spanish)
has exact synonym: vasculature
has exact synonym: 維管束系 (Japanese)

shoot apex
type: Class
subclass of: shoot axis
IAO_0000115: 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).
has exact synonym: &#225pice del epiblasto (epiblastema) (Spanish)
has exact synonym: シュート頂、茎頂 (Japanese)

peripheral zone
type: Class
subclass of: portion of meristem tissue
subclass of: Restriction
  on property: part_of
  some values from: shoot apical meristem
IAO_0000115: A portion of meristem tissue (PO:0009013) which is the organogenic region of the meristem, characterized by higher rates of cell division.
has exact synonym: zona perif&#233rica (Spanish)
has exact synonym: 周辺帯 (Japanese)
has related synonym: peripheral meristem

meristematic cell
type: Class
subclass of: native plant cell
IAO_0000115: A native plant cell (PO:0025606) synthesizing protoplasm and producing new cells by division and with only a primary cell wall.
has exact synonym: c&#233lula meristem&#225tica (Spanish)
has exact synonym: stem cell
has exact synonym: 分裂組織細胞 (Japanese)

scutellar node
type: Class
subclass of: stem node
subclass of: embryo plant structure
subclass of: Restriction
  on property: part_of
  some values from: plant embryo axis
IAO_0000115: A stem node that is the part of an embryo axis directly above the radicle where the scutellum is attached.
has exact synonym: nodo escutelar (Spanish)
has exact synonym: 胚盤節 (Japanese)

shoot axis node
type: Class
subclass of: cardinal organ part
subclass of: Restriction
  on property: part_of
  some values from: shoot axis
IAO_0000115: A cardinal organ part (PO:0025001) of a shoot axis (PO:0025029) where a bud (PO:0000055) may form and develop into a branch (PO:0025073), leaf (PO:0025034), flower (PO:0004541), inflorescence (PO:0009049) or nodal root (PO:0003005).
has exact synonym: nodo del epiblasto (epiblastema) (Spanish)
has exact synonym: シュート 節 (Japanese)

xylem
type: Class
subclass of: portion of vascular tissue
IAO_0000115: A portion of vascular tissue (PO:0009015) that has as part one or more tracheary elements (PO:0000290).
has exact synonym: portion of xylem tissue
has exact synonym: xilema (Spanish)
has exact synonym: 木質部 (Japanese)

cambium
type: Class
subclass of: lateral meristem
IAO_0000115: 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.
has exact synonym: cambium (Spanish)
has exact synonym: 形成層 (Japanese)

vascular cambium
type: Class
subclass of: cambium
IAO_0000115: A cambium (PO:0005597) that is located between and gives rise to secondary xylem (PO:0005848) and secondary phloem (PO:0005043).
has exact synonym: cambium vascular (Spanish)
has exact synonym: 維管束形成層 (Japanese)

secondary xylem
type: Class
subclass of: xylem
subclass of: secondary vascular tissue
subclass of: Restriction
  on property: develops_from
  some values from: vascular cambium
IAO_0000115: A portion of xylem (PO:0005352) tissue that develops from a vascular cambium (PO:0005598).
has exact synonym: portion of secondary xylem tissue
has exact synonym: wood
has exact synonym: xilema secundario (Spanish)
has exact synonym: 二次木部 (Japanese)

phyllome
type: Class
subclass of: plant organ
subclass of: Restriction
  on property: part_of
  some values from: shoot system
subclass of: Restriction
  on property: develops_from
  some values from: phyllome primordium
IAO_0000115: A lateral plant organ (PO:0009008) produced by a shoot apical meristem (PO:0020148).
has exact synonym: filoma (Spanish)
has exact synonym: フィロム、葉(的）器官 (Japanese)

shoot system meristem
type: Class
subclass of: portion of meristem tissue
subclass of: Restriction
  on property: part_of
  some values from: shoot system
IAO_0000115: A portion of meristem tissue (PO:0009013) that is part of a shoot system (PO:0009006).
has exact synonym: meristema del epiblasto (epiblastema) (Spanish)
has exact synonym: シュート分裂組織 (Japanese)

protoderm
type: Class
subclass of: portion of meristem tissue
IAO_0000115: 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).
has exact synonym: portion of protoderm tissue
has exact synonym: protodermis (Spanish)
has exact synonym: 前表皮、原表皮 (Japanese)
has related synonym: dermatogen cell

vegetative shoot apical meristem
type: Class
subclass of: shoot apical meristem
IAO_0000115: A shoot apical meristem (PO:0020148) that gives rise to the apical growth of vegetative tissues and organs.
has exact synonym: meristema vegetativo apical del epiblasto (epiblastema) (Spanish)
has exact synonym: 栄養シュート頂端分裂組織 (Japanese)
has related synonym: vegetative meristem

plant cell
type: Class
subclass of: plant structure
disjoint with: portion of plant tissue
disjoint with: plant organ
disjoint with: cardinal organ part
disjoint with: collective plant organ structure
IAO_0000115: A cell which is a plant structure (PO:0009011).
has broad synonym: cell
has exact synonym: c&#233lula vegetal (Spanish)
has exact synonym: 植物細胞 (Japanese)

shoot system
type: Class
subclass of: collective plant organ structure
IAO_0000115: 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.
has exact synonym: sistema de epiblasto (epiblastema) (Spanish)
has exact synonym: シュート系、苗条系 (Japanese)
has narrow synonym: tree crown
has related synonym: Poaceae crown
has related synonym: shoot
has related synonym: thalli
has related synonym: thallus

portion of plant tissue
type: Class
subclass of: plant structure
disjoint with: plant organ
disjoint with: cardinal organ part
disjoint with: collective plant organ structure
IAO_0000115: A plant structure (PO:0009011) that consists predominantly of similarly specialized plant cells (PO:0009002) of one or more types.
has broad synonym: portion of tissue
has broad synonym: tissue
has exact synonym: porci&#243n de un tejido vegetal (Spanish)
has exact synonym: 植物組織の一部 (Japanese)
has related synonym: plant tissue

plant organ
type: Class
subclass of: multi-tissue plant structure
IAO_0000115: 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.
has broad synonym: organ
has exact synonym: &#243rgano vegetal (Spanish)
has exact synonym: 植物 器官 (Japanese)
has related synonym: compound plant organ
has related synonym: simple plant organ

plant embryo
type: Class
subclass of: whole plant
IAO_0000115: A whole plant (PO:0000003) that participates in the plant embryo stage (PO:0007631).
has broad synonym: embryo
has exact synonym: embri&#243n (Spanish)
has exact synonym: 植物胚 (Japanese)
has related synonym: germ

plant structure
type: Class
subclass of: plant anatomical entity
IAO_0000115: An anatomical structure that is or was part of a plant, or was derived from a part of a plant.
has exact synonym: estructura vegetal (Spanish)
has exact synonym: 植物 構造 (Japanese)

portion of meristem tissue
type: Class
subclass of: portion of plant tissue
subclass of: Restriction
  on property: has_part
  some values from: meristematic cell
IAO_0000115: 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.
has exact synonym: meristem
has exact synonym: meristema (Spanish)
has exact synonym: meristematic tissue
has exact synonym: 分裂組織 (Japanese)

portion of vascular tissue
type: Class
subclass of: portion of plant tissue
subclass of: Restriction
  on property: part_of
  some values from: vascular system
IAO_0000115: A portion of plant tissue (PO:0009007) that has as part one or more tracheary elements (PO:0000290) or sieve elements (PO:0025406).
has exact synonym: porci&#243n de tejido vascular (Spanish)
has exact synonym: vascular tissue
has exact synonym: 維管束細胞の一部 (Japanese)
has related synonym: vascular system

vascular leaf
type: Class
subclass of: leaf
subclass of: Restriction
  on property: develops_from
  some values from: vascular leaf primordium
IAO_0000115: A leaf (PO:0025034) in a vascular plant.
has exact synonym: foliage leaf
has exact synonym: hoja vascular (Spanish)
has exact synonym: leaf, vascular
has exact synonym: vascular leaves
has exact synonym: 維管束のある葉, または維管束植物の葉 (Japanese)
has narrow synonym: ascidia
has narrow synonym: ascidium
has narrow synonym: fiddlehead
has narrow synonym: frond
has narrow synonym: needle-like leaf
has narrow synonym: pitcher
has narrow synonym: pitcher blade
has narrow synonym: pitcher-blade
has narrow synonym: scale-like leaf
has narrow synonym: sterile frond
has narrow synonym: trophophyll
has related synonym: crozier
has related synonym: macrophyll
has related synonym: megaphyll

stem
type: Class
subclass of: shoot axis
IAO_0000115: A shoot axis (PO:0025029) that is the primary axis of a plant.
has exact synonym: ca&#241a (Spanish)
has exact synonym: culm
has exact synonym: eje primario (Spanish)
has exact synonym: primary axis
has exact synonym: primary stem
has exact synonym: tallo (Spanish)
has exact synonym: tronco (Spanish)
has exact synonym: 茎 (Japanese)
has narrow synonym: bole
has narrow synonym: cane
has narrow synonym: caudex
has narrow synonym: caudices
has narrow synonym: primocane
has narrow synonym: scape
has narrow synonym: stalk
has narrow synonym: trunk

plant embryo axis
type: Class
subclass of: plant axis
subclass of: embryo plant structure
subclass of: Restriction
  on property: part_of
  some values from: plant embryo
IAO_0000115: A plant axis (PO:0025004) that is the axial part of a plant embryo (PO:0009009).
has broad synonym: embryo axis
has exact synonym: eje del embri&#243n (Spanish)
has exact synonym: hypocotyl-root axis
has exact synonym: 植物胚軸 (Japanese)
has narrow synonym: zygotic plant embryo axis

cotyledon
type: Class
subclass of: vascular leaf
subclass of: Restriction
  on property: develops_from
  some values from: cotyledon primordium
IAO_0000115: A vascular leaf (PO:0009025) formed at the first shoot node (PO:0005004) of a plant embryo (PO:0009009) or a seedling (PO:0000003).
has exact synonym: cotiled&#243n (Spanish)
has exact synonym: seed leaf
has exact synonym: 子葉 (Japanese)

stem node
type: Class
subclass of: shoot axis node
subclass of: Restriction
  on property: part_of
  some values from: stem
IAO_0000115: A shoot node that is part of a stem.
has exact synonym: nodo del tallo (Spanish)
has exact synonym: 茎節 (Japanese)

apical meristem
type: Class
subclass of: portion of meristem tissue
subclass of: Restriction
  on property: has_part
  some values from: protoderm
IAO_0000115: A maximal portion of meristem tissue (PO:0009013) located at a shoot apex (PO:0000037) or root tip (PO:0000025).
has broad synonym: promeristem
has exact synonym: AM
has exact synonym: meristema apical (Spanish)
has exact synonym: 頂端分裂組織 (Japanese)
has related synonym: primary meristem

lateral meristem
type: Class
subclass of: portion of meristem tissue
subclass of: Restriction
  on property: part_of
  some values from: plant axis
IAO_0000115: 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.
has exact synonym: lateral growth meristem
has exact synonym: meristema lateral (Spanish)
has exact synonym: 側 分裂組織 (Japanese)
has related synonym: secondary meristem

shoot apical meristem
type: Class
subclass of: shoot system meristem
subclass of: apical meristem
subclass of: Restriction
  on property: part_of
  some values from: shoot apex
IAO_0000115: 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).
has broad synonym: promeristem
has exact synonym: SAM
has exact synonym: meristema apical del epiblasto (epiblastema) (Spanish)
has exact synonym: 茎頂分裂組織 (Japanese)
has related synonym: primary shoot meristem

cardinal organ part
type: Class
equivalent class: Class
  intersection of: cardinal part of multi-tissue plant structure
  intersection of: Restriction
    on property: part_of
    some values from: plant organ
subclass of: cardinal part of multi-tissue plant structure
subclass of: Restriction
  on property: part_of
  some values from: plant organ
IAO_0000115: 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.
has exact synonym: cardinal part of plant organ
has exact synonym: parte de un &#243rgano cardinal (Spanish)
has exact synonym: 基本的な（主要な）器官部 (Japanese)

plant axis
type: Class
subclass of: plant organ
IAO_0000115: An axial plant organ (PO:0009008).
has exact synonym: eje de la planta (Spanish)
has exact synonym: plant axes
has exact synonym: 植物軸（軸柱） (Japanese)

collective plant organ structure
type: Class
subclass of: collective plant structure
subclass of: Restriction
  on property: has_part
  some values from: plant organ
IAO_0000115: 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).
has exact synonym: estructura vegetal colectiva de &#243rgano (Spanish)
has exact synonym: 集合植物器官構造 (Japanese)

embryo plant cell
type: Class
equivalent class: Class
  intersection of: native plant cell
  intersection of: Restriction
    on property: part_of
    some values from: plant embryo
subclass of: embryo plant structure
subclass of: native plant cell
subclass of: Restriction
  on property: part_of
  some values from: plant embryo
IAO_0000115: A native plant cell (PO:0025606) that is part of a plant embryo (PO:0009009).
has broad synonym: embryo cell
has broad synonym: embryonic cell
has exact synonym: c&#233lula embri&#243nica vegetal (Spanish)
has exact synonym: embryonic plant cell
has exact synonym: 胚性植物細胞 (Japanese)

shoot axis
type: Class
subclass of: plant axis
subclass of: Restriction
  on property: part_of
  some values from: shoot system
IAO_0000115: A plant axis (PO:0025004) that is part of a shoot system (PO:0009006).
has exact synonym: caullome
has exact synonym: eje del epiblasto (epiblastema) (Spanish)
has exact synonym: シュート軸 (Japanese)
has related synonym: shoot

leaf
type: Class
subclass of: phyllome
IAO_0000115: A phyllome (PO:0006001) that is not associated with a reproductive structure.
has exact synonym: hoja (Spanish)
has exact synonym: 葉 (Japanese)

embryo plant structure
type: Class
equivalent class: Class
  intersection of: plant structure
  intersection of: Restriction
    on property: part_of
    some values from: plant embryo
subclass of: plant structure
subclass of: Restriction
  on property: part_of
  some values from: plant embryo
IAO_0000115: A plant structure (PO:0009011) that is part of an plant embryo (PO:0009009).
has exact synonym: embryonic plant structure
has exact synonym: estructura vegetal embri&#243nica (Spanish)
has exact synonym: 胚性植物構造 (Japanese)

primordium
type: Class
subclass of: portion of meristem tissue
IAO_0000115: 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).
has exact synonym: portion of primordial tissue
has exact synonym: portion of primordium tissue
has exact synonym: primordia
has exact synonym: primordio (Spanish)
has exact synonym: 原基（可視的） (Japanese)

phyllome primordium
type: Class
subclass of: primordium
subclass of: Restriction
  on property: part_of
  some values from: shoot apex
subclass of: Restriction
  on property: develops_from
  some values from: phyllome anlagen
IAO_0000115: 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).
has exact synonym: phyllome primordia
has exact synonym: portion of phyllome primordium tissue
has exact synonym: primordio del filoma (Spanish)
has exact synonym: フィロム原基（可視的） (Japanese)

plant anatomical entity
type: Class
IAO_0000115: An anatomical entity that is or was part of a plant.
has exact synonym: entidad anat&#243mica vegetal (Spanish)
has exact synonym: 植物 解剖学（形態）的実体 (Japanese)

vegetative shoot apex
type: Class
subclass of: shoot apex
subclass of: Restriction
  on property: has_part
  some values from: vegetative shoot apical meristem
IAO_0000115: A shoot apex PO:0000037) that has as part a vegetative shoot apical meristem (PO:0008016).
has exact synonym: &#225pice vegetativo del epiblasto (epiblastema) (Spanish)
has exact synonym: 栄養シュート頂、栄養枝頂 (Japanese)

portion of embryo plant tissue
type: Class
equivalent class: Class
  intersection of: portion of plant tissue
  intersection of: Restriction
    on property: part_of
    some values from: plant embryo
subclass of: portion of plant tissue
subclass of: embryo plant structure
subclass of: Restriction
  on property: part_of
  some values from: plant embryo
IAO_0000115: A portion of plant tissue that is part of a plant embryo.
has broad synonym: portion of embryo tissue
has exact synonym: portion of embryonic plant tissue
has exact synonym: tejido embri&#243nico vegetal (Spanish)
has exact synonym: 植物胚性組織 の一部 (Japanese)

cotyledonary node
type: Class
subclass of: stem node
IAO_0000115: A stem node from which one or more cotyledons grow.
has exact synonym: nodo del cotiled&#243n (Spanish)
has exact synonym: 子葉節 (Japanese)

secondary vascular tissue
type: Class
equivalent class: Class
  intersection of: portion of vascular tissue
  intersection of: Restriction
    on property: develops_from
    some values from: vascular cambium
subclass of: portion of vascular tissue
subclass of: Restriction
  on property: develops_from
  some values from: vascular cambium
IAO_0000115: A portion of vascular tissue (PO:0009015) that develops from a vascular cambium (PO:0005598).
has exact synonym: tejido vascular secundario (Spanish)
has exact synonym: 二次維管組織 (Japanese)

phyllome anlagen
type: Class
subclass of: portion of meristem tissue
subclass of: Restriction
  on property: part_of
  some values from: peripheral zone
IAO_0000115: 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).
has broad synonym: phyllome meristem
has exact synonym: フィロム原基 (Japanese)

vascular leaf anlagen
type: Class
subclass of: phyllome anlagen
subclass of: Restriction
  on property: part_of
  some values from: vegetative shoot apical meristem
IAO_0000115: 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).
has broad synonym: leaf meristem
has exact synonym: 維管束系葉原基 (Japanese)

cotyledon anlagen
type: Class
subclass of: portion of embryo plant tissue
subclass of: phyllome anlagen
subclass of: Restriction
  on property: part_of
  some values from: plant embryo
IAO_0000115: A phyllome anlagen (PO:0025430) that will give rise to a cotyledon primordium (PO:0000015) and is part of a peripheral zone (PO:000225) of an embryo shoot apical meristem (PO:0006362).
has exact synonym: precursor de cotiled&#243n (Spanish)
has exact synonym: 子葉原基 (Japanese)

multi-tissue plant structure
type: Class
subclass of: plant structure
IAO_0000115: 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.
has exact synonym: estructura vegetal con m&#250ltiples tejidos (Spanish)
has exact synonym: 複数の組織からなる植物構造 (Japanese)

collective plant structure
type: Class
subclass of: plant structure
IAO_0000115: 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).
has exact synonym: estructura vegetal colectiva (Spanish)
has exact synonym: 集合的植物構造 (Japanese)

cardinal part of multi-tissue plant structure
type: Class
subclass of: plant structure
subclass of: Restriction
  on property: part_of
  some values from: multi-tissue plant structure
IAO_0000115: 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.
has exact synonym: parte cardinal de estructura vegetal con m&#250ltiples tejidos (Spanish)
has exact synonym: 複数の組織からなる植物構造の基本（主要）部分 (Japanese)

native plant cell
type: Class
subclass of: plant cell
IAO_0000115: 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).