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| Word | Description |
| Fall |
The name given to the outer parts of the flowers of an iris which seem to fall downwards or outwards. |
| Fall |
Autumn. |
| Family |
A group of plants sharing common features and distinctive characteristics and comprising related genera; the taxonomic category above genus and below order. Group of genera. |
| Fertilization |
The union of male and female sex cells. |
| Filament |
The stalk of a stamen. |
| Filiform |
Thread-like. |
| Foot |
Anglosaxon measurement of length. Equivalent to 30 cm. |
| Forcing |
To bring a plant into earlier growth, generally by raising the temperature or by transplanting into a warmer situation. |
| Form |
The lowest rank given to plants by botanists and referring to a slight variation from the species such as a distinct color or shape of leaf but not meriting distinctive species ranking. |
| Forma |
Plural of form. |
| Fosteriana group |
Tulipa fosteriana with her cultivars, subspecies, varieties and hybrids, which resemble T. fosteriana. Early flowering, leaves very broad, green or grey green, stem medium to long, large long flower, base variable. |
| Fringed group |
Single flowered cultivars, tepals are edged with crystal shaped fringes, mid season or late flowering.Stem of variable length. |