FOLIACEOUS: Being or resembling a leaf. In botany, having the texture or form of a leaf, as a foliaceous sepal or bract.
FOLIAGE: The mass of growing plant leaves in their natural form and condition, or a cluster of the same; leafage.
FOLIAGE PLANT: A plant grown for its attractive foliage rather than for its flowers, as the various kinds of Coleus and Philodendron.
FOLIAR: Consisting of or pertaining to leaves.
FOLIAR FEEDING: Feeding plants by spraying plant food on their leaves.
FOLIATE: Leafy; covered with leaves or leaflets (i.e. foliate stalk).
FOLIATION: The leafing of plants; the disposition of the beginning leaves within the bud.
FOLIICOLOUS: Growing upon leaves; parasitic on leaves, as many fungi.
FOLIOLATE: Pertaining to, consisting of, or having leaflets. Used in combination, as bifoliolate, having two leaflets.
FOLIOLE: A leaflet; a small part resembling a leaf.
FOLIOSE: Leafy or resembling a leaf. Also folious.
FOLLICLE: A dry, one-celled seed vessel consisting of a single carpel and dehiscent only by the ventral suture, as in the milkweed and larkspur.
FOOTSTALK: The stalk, or petiole, of a leaf or the peduncle of a flower.
FORCING: The practice of bringing a plant into growth or flower (usually by artificial heat or controlling daylight) at a season earlier than its natural one.
FORCING HOUSE: A hothouse used for forcing plants.
FORCING PIT: A pit of wood or masonry, sunk in the earth, for containing fermenting materials to produce bottom heat in forcing plants.
FORM: A botanical category ranking below a variety and differing only trivially from other related forms, such as in flower color.
FORNICATE: Overarched fornices, as the throat of the corolla of the forget-me-not. Also forniciform.
FORNIX: (Plural: fornices) A small, arching scale or appendage in the throat of the corolla of some plants, such as in forget-me-nots.