abstract
alone
black
botany
branch
contour
crown
deciduous
eco
ecology
element
environment
flora
floral
foliage
forest
green
illustration
interlacement
isolated
landscape
leaf
leaves
lone
lonely
milieu
natural
nature
object
outdoor
outline
plant
plexus
root
season
shape
sheet
silhouette
single
sylvan
timber
tree
trunk
vegetation
white
wood
woodland
woodsy
woody