F1 First generation offspring of the mating of two different varieties
Falcate Sickle-shaped, curved and tapering to a point
FalciformShaped like a sickle or scythe
Family Made up of one or more genera whose similarities are greater than their differences
FascicleA close or tight bundle or cluster
Fasciculate Arranged or growing in bundles or clusters; several leaves growing from a common axis
Fenestrate Provided with openings or windows; windowed
Ferruginous Rust colored, reddish-brown
Fertile Seed bearing, when the term is applied to seed, it means seed which are capable of producing plants
FibrousBearing or resembling fiber, a flexible, strong, and stringy resemblance
Filiform Threadlike, very slender and cylindrical, often with bends and curves
Fimbriate Fringed, as the edge of petals; having fimbriae
FlaccidLimp and lax; without rigidity
Fleshy Thick, firm, juicy (succulent) and often brittle (breaks or cracks easily when the leaf is bent) texture
Flexuous Having a gentle bending direction, alternately in opposite directions such as inwards and outwards
Floccose (Felted) having locks of soft wooly hairs that rub off easily, like tomentose but scattered in tufts
Flora Plants of a specific region
Foliaceous Leafy or leaf-like in texture or shape
Foliage Leaves of a plant
Form In taxonomy, one of the secondary subdivisions below variety which is below species, based on a single morphological difference
FoveolateSurface pitted with shallow distinct depressions. Example: B. ‘Tom Ment’ leaves
FreeNot united with any other organs; not attached at one end
Fruit The mature fertilized ovary that has ripened and contains seeds, the capsule
Fruticose Shrubby, bushy, with many branching stems
Fugacious, fugaciouslyFalling or withering away early
Fulvous Yellow-brownish color, tawny
FuniculusStalk bearing the ovule
Fuscescent Dusky; approaching dark brown or tinged with that color
FusedTo become joined together as if melting together
Fusiform Swollen in the middle and tapering to each end like a spindle