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| floccosus floccosa floccosum  | wooly | |||
| floccus | flocc | noun/m | a lock of wool | |
| osus | os | adj | adjective suffix for nouns: plenitude or notable development | |
| Corethrogyne floccosa Greene Cirsium floccosum (Rydb.) Petrak Tragopogon floccosus Waldst. & Kit.  | ||||
| florentinus florentina florentinum  | of Florence, Italy | |||
| florentinus | florentin | adj | Florentinus of Florentia: Florence, Italy  | |
| Iris florentina L. Hieracium florentinum All. Cistus florentinus Lam.  | ||||
| floribundus floribunda floribundum  | profusely flowered | |||
| flos | flor | noun/m | L. flower  | |
| i | i | cnct | connective vowel used by botanical Latin | |
| bundus | bund | adj | adjective suffix for verbs: in the process of, -ing | |
| Physaria floribunda Rydb. Antiphytum floribundum (Torr.) Gray Mimulus floribundus Lindl.  | ||||
| floricomus floricoma floricomum  | hairy flowers | |||
| flos | flor | noun/m | L. flower  | |
| i | i | cnct | connective vowel used by botanical Latin | |
| come | com | noun/f | κομη 
 hair hair, foliage  | |
| us | adj | Latinizing suffix | ||
| Rubus floricomus Blanch. | ||||
| floridulus floridula floridulum  | somewhat flowering | |||
| floridulus | floridul | adj | somewhat flowering | |
| Saccharum floridulum Labill. Miscanthus floridulus (Labill.) Warb. ex K. Schum. & Laut.  | ||||
| floridus florida floridum  | flowering | |||
| flos | flor | noun/m | L. flower  | |
| idus | id | adj | adjective suffix for verbs, nouns or adjectives: condition or progression | |
| Cornus florida L. Cercidium floridum Benth. ex Gray Calycanthus floridus L.  | ||||
| florifer florifera floriferum  | flower bearing | |||
| flos | flor | noun/m | L. flower  | |
| i | i | cnct | connective vowel used by botanical Latin | |
| fer | fer | apar | fero to bear, carry, bring  | |
| Townsendia florifer (Hook.) Gray Crataegus florifera Sarg. Sedum floriferum Praeger  | ||||
| floriger florigera florigerum  | flower bearing | |||
| flos | flor | noun/m | L. flower  | |
| i | i | cnct | connective vowel used by botanical Latin | |
| ger | ger | apar | gero to carry, bear, wear  | |
| Rubus floriger Bailey | ||||
| florosus florosa florosum  | abundantly flowered | |||
| florosus | floros | adj | abundantly flowered | |
| florulentus florulenta florulentum  | abundantly flowered | |||
| flos | flor | noun/m | L. flower  | |
| ulentus | ulent | adj | adjective suffix for nouns: plenitude or notable development, from more recent coinage of words, see '-osus' | |
| Stemodia florulenta W. R. Barker Rubus florulentus Focke  | ||||
| florus flora florum  | flowered | |||
| florus | flor | ppar | floreo to bloom, to flower  | |
| flos-cuculi flores-cuculorum  | cuckoo flower | |||
| flos | flor | noun/m | L. flower  | |
| - | - | cnct | ||
| generative of cuculus | cucul | noun/m | the cuckoo bird | |
| Lychnis flos-cuculi L. | ||||
| flos-jovis flores-jovium  | flower of Jupiter | |||
| flos | flor | noun/m | L. flower  | |
| - | - | cnct | ||
| generative of jupiter | jov | noun/m | Jupiter Jupiter, chief of the gods  | |
| Lychnis flos-jovis (L.) Desr. | ||||
| flos-reginae flores-reginarum  | queen's flower | |||
| flos | flor | noun/m | L. flower  | |
| - | - | cnct | ||
| generative of regina | regin | noun/f | a queen | |
| Lagerstroemia flos-reginae Retz. | ||||
| flumineus fluminea flumineum  | of a river | |||
| flumineus | flumine | adj | of a river, river- | |
| fluviatilis fluviatilis fluviatile  | from a river | |||
| fluviatilis | fluviatil | adj | of or belonging to a river | |
| Equisetum fluviatile L. Bolboschoenus fluviatilis (Torr.) Soj€k  | ||||
| foecundissimus foecundissima foecundissimum  | most abundant, fruitfull | |||
| superlative of foecundus | foecund | adj | fecundus fruitful, abundant, fertile, prolific (erroneously foecundus)  | |
| issimus | issim | adj | superlative suffix; most so, to the greatest degree; most-, -est (e.g. largest, prettiest, whitest) | |
| Rosa foecundissima Munchh. | ||||
| foenum-graecum foena-graeca  | Greek hay | |||
| foenum | foen | noun/n | faenum L (also fenum, incorrectly foenum) hay  | |
| - | - | cnct | ||
| graecus | graec | adj | Graecus of or belonging to the Greeks  | |
| Trigonella foenum-graecum L. | ||||
| foetidissimus foetidissima foetidissimum  | most foetid | |||
| superlative of foetidus | foetid | adj | stinking, bad smelling | |
| issimus | issim | adj | superlative suffix; most so, to the greatest degree; most-, -est (e.g. largest, prettiest, whitest) | |
| Iris foetidissima L. Mastichodendron foetidissimum (Jacq.) H.J. Lam  | ||||
| foetidus foetida foetidum  | unpleasantly scented | |||
| foetidus | foetid | adj | stinking, bad smelling | |
| Vestia foetida (Ruíz & Pav.) Hoffsgg. Chenopodium foetidum Schrad. Symplocarpus foetidus (L.) Salisb. ex Nutt.  | ||||
| foliaceus foliacea foliaceum  | leafy, resembling a leaf | |||
| folium | foli | noun/n | leaf | |
| aceus | ace | adj | adjective suffix for nouns: resembles, of..., ...like, mixture using, fragrance of; borrowed from nouns declined like ...ax, ...acis + eus | |
| Ulmus foliacea Gilib., nom. inval. Symphyotrichum foliaceum (DC.) Nesom Aster foliaceus Lindl. ex DC.  | ||||
| foliolosus foliolosa foliolosum  | having small leaves | |||
| folium | foli | noun/n | leaf | |
| olum | ol | noun/n | olus substantive suffix for 1st & 2nd declention nouns: diminutive  | |
| osus | os | adj | adjective suffix for nouns: plenitude or notable development | |
| Castilleja foliolosa Hook. & Arn. Thalictrum foliolosum DC. Adenocarpus foliolosus (Aiton) DC.  | ||||
| foliosior foliosior foliosius  | leafier | |||
| comparative of foliosus | folios | adj | leafy | |
| ior | adj | comparative suffix; more so, to a greater degree; more-, -er (e.g. larger, prettier, whiter) | ||
| foliosissimus foliosissima foliosissimum  | leafiest | |||
| superlative of foliosus | folios | adj | leafy | |
| issimus | issim | adj | superlative suffix; most so, to the greatest degree; most-, -est (e.g. largest, prettiest, whitest) | |
| Polemonium foliosissimum Gray | ||||
| foliosus foliosa foliosum  | leafy | |||
| foliosus | folios | adj | leafy | |
| Dalea foliosa (Gray) Barneby Chenopodium foliosum (Moench) Aschers. Erigeron foliosus Nutt.  | ||||
| fontanus fontana fontanum  | of a spring | |||
| fontanus | fontan | adj | of a spring or fountain | |
| Adicea fontana Lunell Cerastium fontanum Baumg. Fissidens fontanus (B. Pyl.) Steud.  | ||||
| fontinalis fontinalis fontinale  | belonging to springs | |||
| fons | font | noun/m | a spring or fountain | |
| inus | in | adj | -ινοϛ 
 adjective suffix for nouns: composition, color, resembling, owning  | |
| alis | al | adj | adjective suffix for nouns: of or pertaining to | |
| Cirsium fontinale (Greene) Jepson Betula fontinalis Sarg.  | ||||