18 wildflowers were recorded blooming in Hawaii in September in our iNaturalist sample; 4 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in September
Madagascar Periwinkle
Tree Tobacco
Alkali Heliotrope
Telegraphweed
Cowpen Daisy
Straggler Daisy
Common Cat's-ear
Woodland Strawberry
Ribwort Plantain
Black Medick
Great Mullein
Scarlet Pimpernel
All wildflowers blooming in Hawaii in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Madagascar Periwinkle | Catharanthus roseus | Dogbane Family | 7 | Jan (past peak) |
| 2 | Tree Tobacco | Nicotiana glauca | nightshade family | 5 | Apr (past peak) |
| 3 | Alkali Heliotrope | Heliotropium curassavicum | borage family | 4 | Dec (rising) |
| 4 | Telegraphweed | Heterotheca grandiflora | Sunflowers, Daisies, Asters, and Allies | 4 | Oct (rising) |
| 5 | Cowpen Daisy | Verbesina encelioides | Sunflowers, Daisies, Asters, and Allies | 4 | Feb (past peak) |
| 6 | Straggler Daisy | Calyptocarpus vialis | Sunflowers, Daisies, Asters, and Allies | 4 | May (past peak) |
| 7 | Common Cat's-ear | Hypochaeris radicata | Sunflowers, Daisies, Asters, and Allies | 3 | Jul (past peak) |
| 8 | Woodland Strawberry | Fragaria vesca | rose family | 2 | Apr (past peak) |
| 9 | Ribwort Plantain | Plantago lanceolata | Plantain Family | 2 | Apr (past peak) |
| 10 | Black Medick | Medicago lupulina | Legumes | 2 | Sep (peak) |
| 11 | Great Mullein | Verbascum thapsus | figwort family | 2 | Sep (peak) |
| 12 | Scarlet Pimpernel | Lysimachia arvensis | primrose family | 2 | May (past peak) |
| 13 | White beggarticks | Bidens alba | Sunflowers, Daisies, Asters, and Allies | 2 | Jan (past peak) |
| 14 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 1 | Sep (peak) |
| 15 | Common Selfheal | Prunella vulgaris | Mint Family | 1 | Aug (past peak) |
| 16 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 1 | Sep (peak) |
| 17 | Lesser hop trefoil | Trifolium dubium | Legumes | 1 | Oct (rising) |
| 18 | White Clover | Trifolium repens | Legumes | 1 | Jul (past peak) |