44 wildflowers were recorded blooming in Florida in September in our iNaturalist sample; 7 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in September

Pine lily

Spotted Horsemint

White beggarticks

Pineland Hibiscus

Whitemouth Dayflower

Madagascar Periwinkle
Turkey Tangle Frogfruit

Spurge Nettle
Blue Curls
Butterfly Pea

Purple Passionflower

Tropical sage
All wildflowers blooming in Florida in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Pine lily | Lilium catesbaei | lily family | 643 | Sep (peak) |
| 2 | Spotted Horsemint | Monarda punctata | Mint Family | 221 | Sep (peak) |
| 3 | White beggarticks | Bidens alba | Sunflowers, Daisies, Asters, and Allies | 198 | Jan (past peak) |
| 4 | Pineland Hibiscus | Sabdariffa aculeata | Mallow and Hibiscus Family | 128 | Jul (past peak) |
| 5 | Whitemouth Dayflower | Commelina erecta | Spiderworts | 92 | May (past peak) |
| 6 | Madagascar Periwinkle | Catharanthus roseus | Dogbane Family | 78 | Oct (rising) |
| 7 | Turkey Tangle Frogfruit | Phyla nodiflora | Verbena Family | 73 | Apr (past peak) |
| 8 | Spurge Nettle | Cnidoscolus stimulosus | Spurge Family | 73 | Apr (past peak) |
| 9 | Blue Curls | Trichostema dichotomum | Mint Family | 72 | Oct (rising) |
| 10 | Butterfly Pea | Centrosema virginianum | Legumes | 71 | Aug (past peak) |
| 11 | Purple Passionflower | Passiflora incarnata | Passionfruit Family | 67 | May (past peak) |
| 12 | Tropical sage | Salvia coccinea | Mint Family | 60 | Apr (past peak) |
| 13 | Pickerelweed | Pontederia cordata | Pickerelweeds | 54 | Apr (past peak) |
| 14 | Climbing Hempvine | Mikania scandens | Sunflowers, Daisies, Asters, and Allies | 53 | Sep (peak) |
| 15 | Alamo vine | Distimake dissectus | bindweed family | 48 | May (past peak) |
| 16 | American groundnut | Apios americana | Legumes | 47 | May (past peak) |
| 17 | Tievine | Ipomoea cordatotriloba | bindweed family | 45 | Sep (peak) |
| 18 | Shaggy Portulaca | Portulaca pilosa | purslane family | 43 | Jun (past peak) |
| 19 | Butterfly Milkweed | Asclepias tuberosa | Dogbane Family | 42 | May (past peak) |
| 20 | Partridge Pea | Chamaecrista fasciculata | Legumes | 42 | Aug (past peak) |
| 21 | Chinese Crown Orchid | Eulophia graminea | Orchids | 42 | Apr (past peak) |
| 22 | Camphorweed | Heterotheca subaxillaris | Sunflowers, Daisies, Asters, and Allies | 38 | Sep (peak) |
| 23 | Saltmarsh mallow | Kosteletzkya pentacarpos | Mallow and Hibiscus Family | 35 | Jul (past peak) |
| 24 | Buttonweed | Diodia virginiana | madder family | 30 | Sep (peak) |
| 25 | Cardinal Flower | Lobelia cardinalis | bellflower family | 28 | Oct (rising) |
| 26 | American white waterlily | Nymphaea odorata | Waterlily Family | 27 | Apr (past peak) |
| 27 | Blue Mistflower | Conoclinium coelestinum | Sunflowers, Daisies, Asters, and Allies | 25 | Oct (rising) |
| 28 | Lantana | Lantana strigocamara | Verbena Family | 25 | Apr (past peak) |
| 29 | American beautyberry | Callicarpa americana | Mint Family | 22 | Jun (past peak) |
| 30 | Firewheel | Gaillardia pulchella | Sunflowers, Daisies, Asters, and Allies | 21 | Apr (past peak) |
| 31 | Largeleaf Pennywort | Hydrocotyle bonariensis | ivy family | 21 | May (past peak) |
| 32 | Wild Potato Vine | Ipomoea pandurata | bindweed family | 20 | Jun (past peak) |
| 33 | Aquatic Milkweed | Asclepias perennis | Dogbane Family | 20 | Aug (past peak) |
| 34 | Pigeonberry | Rivina humilis | Petiveria Family | 20 | Feb (past peak) |
| 35 | Catchfly Prairie Gentian | Eustoma exaltatum | gentian family | 19 | Jun (past peak) |
| 36 | American hog-peanut | Amphicarpaea bracteata | Legumes | 19 | Sep (peak) |
| 37 | Frostweed | Verbesina virginica | Sunflowers, Daisies, Asters, and Allies | 19 | Oct (rising) |
| 38 | St. Andrew's cross | Hypericum hypericoides | St. John's wort family | 19 | Aug (past peak) |
| 39 | Swamp Milkweed | Asclepias incarnata | Dogbane Family | 19 | Aug (past peak) |
| 40 | Orange Milkwort | Senega lutea | milkworts | 19 | Mar (past peak) |
| 41 | Buttonbush | Cephalanthus occidentalis | madder family | 18 | May (past peak) |
| 42 | Manyflower Marshpennywort | Hydrocotyle umbellata | ivy family | 18 | Mar (past peak) |
| 43 | American trumpet vine | Campsis radicans | bignonia family | 17 | Jun (past peak) |
| 44 | Bristle Thistle | Cirsium horridulum | Sunflowers, Daisies, Asters, and Allies | 17 | Mar (past peak) |