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| shoot roots herbaceous woody meristems apical meristems primary growth ground meristem protoderm procambium ground tissue epidermal tissue vascular tissue lateral meristems cambia secondary growth intercalary meristems parenchyma cells chlorenchyma cells chollenchyma cells sclerenchyma cells secondary cell walls lignin sclereids fibers epidermis dermal tissue cuticle cutin desiccation stomata guard cells potassium ions turgor pressure abscisic acid transpiration trichomes leaf hairs root hairs xylem phloem stele tracheids vessel elements pits sap sieve cells sieve pores sieve tube members sieve plates companion cells stem nodes internodes petiole leaf axil axillary buds internodal regions rosettes vascular bundles monocotyledons monocots dicotyledons dicots cortex pith stolons tendrils tubers rhizomes leaves blade midrib leaflets pinnate compound leaflets palmate compound leaflets leaf epidermis leaf veins netted parallel ground tissue mesophyll columnar cells palisade mesophyll cells chlorenchyma cells spines bracts storage leaves leaf abscission deciduous trees evergreens abscission zone primary root taproot system fibrous root system adventitious roots root tip root cap cortex pericycle mucigel root hairs cortex endodermis suberin casparian strip lateral roots phloem strands pneumatophores aerial roots buttress roots legume vascular cambium secondary growth secondary xylem secondary phloem growth rings heartwood sapwood hardwood trees wood grain dendrochronology bark periderm cork cambium cork phelloderm |