Farinose. Covered with a meal-like powder.
Fascicle. A close bundle or cluster.
Fastigiate (branches). Erect and near together.
Ferruginous. Rust-color.
Fertile. Capable of producing fruit, or productive, as a flower having a pistil, or an anther with pollen.
Fibrillose. Furnished or abounding with fine fibres.
Fibrous. Composed of or resembling fibres. Fibrous tissue, a tissue formed of elongated thick-walled cells.
Fibro-vascular. Composed of woody fibres and ducts.
Filament. The part of a stamen which supports the anther; any thread-like body.
Filamentous. Composed of threads.