60 wildflowers were recorded blooming in California in December in our iNaturalist sample; 3 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in December

California fuchsia

Emory's rockdaisy

Desert Sunflower

Coyote Brush

Bladderpod

Thickleaf Groundcherry

Desert Lavender

Desert Sand Verbena
Redstem Stork's-bill

Big Berry Manzanita

California Buckwheat
Spanish needle
All wildflowers blooming in California in December
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | California fuchsia | Epilobium canum | evening primrose family | 570 | Oct (past peak) |
| 2 | Emory's rockdaisy | Perityle emoryi | Sunflowers, Daisies, Asters, and Allies | 460 | Mar (past peak) |
| 3 | Desert Sunflower | Geraea canescens | Sunflowers, Daisies, Asters, and Allies | 433 | Mar (past peak) |
| 4 | Coyote Brush | Baccharis pilularis | Sunflowers, Daisies, Asters, and Allies | 431 | Oct (past peak) |
| 5 | Bladderpod | Cleomella arborea | Spider Flower Family | 423 | Feb (past peak) |
| 6 | Thickleaf Groundcherry | Physalis crassifolia | nightshade family | 392 | Mar (past peak) |
| 7 | Desert Lavender | Condea emoryi | Mint Family | 288 | Mar (past peak) |
| 8 | Desert Sand Verbena | Abronia villosa | four o'clock family | 279 | Mar (past peak) |
| 9 | Redstem Stork's-bill | Erodium cicutarium | Geranium family | 262 | Mar (past peak) |
| 10 | Big Berry Manzanita | Arctostaphylos glauca | heath family | 261 | Jan (past peak) |
| 11 | California Buckwheat | Eriogonum fasciculatum | knotweed family | 254 | Jun (past peak) |
| 12 | Spanish needle | Palafoxia arida | Sunflowers, Daisies, Asters, and Allies | 248 | Mar (past peak) |
| 13 | Chuparosa | Justicia californica | Acanthus Family | 236 | Mar (past peak) |
| 14 | Creosote Bush | Larrea tridentata | caltrops | 209 | Mar (past peak) |
| 15 | Western Joshua Tree | Yucca brevifolia | agave and allies | 205 | Mar (past peak) |
| 16 | Sweetbush | Bebbia juncea | Sunflowers, Daisies, Asters, and Allies | 200 | Dec (peak) |
| 17 | Notch-leaf Scorpionweed | Phacelia crenulata | borage family | 198 | Mar (past peak) |
| 18 | Rush Milkweed | Asclepias subulata | Dogbane Family | 187 | Dec (peak) |
| 19 | Tree Tobacco | Nicotiana glauca | nightshade family | 186 | Apr (past peak) |
| 20 | Parish's Goldeneye | Bahiopsis parishii | Sunflowers, Daisies, Asters, and Allies | 179 | Mar (past peak) |
| 21 | Browneyes | Chylismia claviformis | evening primrose family | 175 | Mar (past peak) |
| 22 | Brittlebush | Encelia farinosa | Sunflowers, Daisies, Asters, and Allies | 173 | Mar (past peak) |
| 23 | Lawn daisy | Bellis perennis | Sunflowers, Daisies, Asters, and Allies | 172 | Apr (past peak) |
| 24 | Telegraphweed | Heterotheca grandiflora | Sunflowers, Daisies, Asters, and Allies | 165 | Sep (past peak) |
| 25 | Milkmaids | Cardamine californica | mustard family | 157 | Feb (past peak) |
| 26 | Bermuda buttercup | Oxalis pes-caprae | Woodsorrel Family | 157 | Mar (past peak) |
| 27 | Distant Phacelia | Phacelia distans | borage family | 156 | Mar (past peak) |
| 28 | Narrow-Leaved Cryptantha | Johnstonella angustifolia | borage family | 154 | Mar (past peak) |
| 29 | Desert Thorn-Apple | Datura discolor | nightshade family | 148 | Nov (past peak) |
| 30 | California brittlebush | Encelia californica | Sunflowers, Daisies, Asters, and Allies | 141 | Apr (past peak) |
| 31 | Desert Tobacco | Nicotiana obtusifolia | nightshade family | 140 | Mar (past peak) |
| 32 | Indigo-Bush | Psorodendron schottii | Legumes | 136 | Apr (past peak) |
| 33 | Desert Trumpet | Eriogonum inflatum | knotweed family | 133 | Dec (peak) |
| 34 | California Aster | Corethrogyne filaginifolia | Sunflowers, Daisies, Asters, and Allies | 113 | Aug (past peak) |
| 35 | Sacred Datura | Datura wrightii | nightshade family | 107 | May (past peak) |
| 36 | Trailing Windmills | Allionia incarnata | four o'clock family | 105 | Oct (past peak) |
| 37 | Arizona lupine | Lupinus arizonicus | Legumes | 102 | Mar (past peak) |
| 38 | Rock Hibiscus | Hibiscus denudatus | Mallow and Hibiscus Family | 99 | Mar (past peak) |
| 39 | Sand Blazingstar | Mentzelia involucrata | Stickleaf Family | 95 | Mar (past peak) |
| 40 | Chinchweed | Pectis papposa | Sunflowers, Daisies, Asters, and Allies | 92 | Oct (past peak) |
| 41 | California bay | Umbellularia californica | laurels | 83 | Feb (past peak) |
| 42 | California shieldpod | Dithyrea californica | mustard family | 79 | Mar (past peak) |
| 43 | Deerweed | Acmispon glaber | Legumes | 74 | May (past peak) |
| 44 | California primrose | Eulobus californicus | evening primrose family | 74 | Mar (past peak) |
| 45 | California fagonbush | Fagonia laevis | caltrops | 70 | Mar (past peak) |
| 46 | Desert Plantain | Plantago ovata | Plantain Family | 69 | Mar (past peak) |
| 47 | Desert Bluebells | Phacelia campanularia | borage family | 68 | Mar (past peak) |
| 48 | White Rhatany | Krameria bicolor | rhatany family | 68 | Nov (past peak) |
| 49 | Apricot Globemallow | Sphaeralcea ambigua | Mallow and Hibiscus Family | 66 | Apr (past peak) |
| 50 | California poppy | Eschscholzia californica | Poppy Family | 65 | Apr (past peak) |