表皮
biology
botany
branch
bundle
cambium
cellular
collenchyma
cork
cortex
cuticle
dermis
development
dicot
dicotyledon
difference
education
flower
food
grass
ground
hair
illustration
isolated
layer
leaf
leave
meristem
minerals
monocot
monocotyledon
nutrient
parenchyma
phloem
pith
plant
ring
root
science
stem
structure
sugar
tissue
transport
tree
vascular
water
woody
xylem