| Chionanthus virginicus | Fringe Tree, White fringetree, Old Man's Beard, Fringe Tree | Oleaceae | C. pubescens. | 1 | 3 |
| Fontanesia phillyreoides fortunei | Xue Liu | Oleaceae | F. fortunei. | 0 | 0 |
| Forestiera acuminata | Swamp Privet, Eastern swampprivet | Oleaceae | Adelia acuminata. Borya acuminata. | 1 | 1 |
| Forestiera neomexicana | Wild Olive | Oleaceae | F. pubescens glabrifolia. Adelia neo-mexicana. | 2 | 0 |
| Forestiera pubescens var. pubescens | Desert Olive | Oleaceae | Forestiera pubescens var. glabrifolia Shinners | 2 | 0 |
| Forsythia suspensa | Lian Qiao, Weeping forsythia | Oleaceae | Syringa suspensa. | 1 | 3 |
| Forsythia viridissima | Golden Bells, Greenstem forsythia, Forsythia | Oleaceae | | 0 | 2 |
| Forsythia x intermedia | Golden Bell, Border Forsythia | Oleaceae | | 0 | 0 |
| Fraxinus americana | White Ash | Oleaceae | F. acuminata. F. alba. F. juglandifolia. | 1 | 2 |
| Fraxinus angustifolia | Narrow-Leaved Ash | Oleaceae | F. rotundifolia. Mill. F. veltheimii. | 1 | 0 |
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