Wood Spurge
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 2,898
Species recorded in Essex
1,113 species
Essex — county
White Willow
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,890
Marsh Foxtail
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,883
White Letter Hairstreak
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 2,866
Celery-leaved Buttercup
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,860
Horse-radish
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 2,856
Smittia pratorum
- Group
- True flies
- Peak month
- March
- Records since 2000
- 2,852
Rock Crane's-bill
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 2,829
Plea minutissima
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 2,819
Winter Aconite
- Group
- Flowering plants
- Peak month
- February
- Records since 2000
- 2,816
Spear-leaved Orache
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,790
Pied Shieldbug
- Group
- True bugs
- Peak month
- April
- Records since 2000
- 2,789
False Fox-sedge
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,785
Chaetocladius piger
- Group
- True flies
- Peak month
- February
- Records since 2000
- 2,768
Varied Carpet Beetle
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 2,765
Polychrome harp ground beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 2,760
Paraphaenocladius impensus
- Group
- True flies
- Peak month
- October
- Records since 2000
- 2,755
Winter Creeper
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 2,746
Hop Trefoil
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,721
19-spot Ladybird
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 2,718
Stenophylax sequax
- Group
- Caddisflies
- Peak month
- March
- Records since 2000
- 2,714
Violet Ground Beetle
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 2,709
Mottled Grasshopper
- Group
- Grasshoppers and crickets
- Peak month
- July
- Records since 2000
- 2,707
Wool-carder Bee
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 2,697
Limnephilus affinis
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 2,681
Psychoda trinodulosa
- Group
- True flies
- Peak month
- July
- Records since 2000
- 2,668
Clytocerus ocellaris
- Group
- True flies
- Peak month
- June
- Records since 2000
- 2,664
Wood Melick
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 2,652
Stinking Hellebore
- Group
- Flowering plants
- Peak month
- March
- Records since 2000
- 2,647
Trioza urticae
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 2,647
Pseudosmittia trilobata
- Group
- True flies
- Peak month
- September
- Records since 2000
- 2,646
Knopper Gall
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 2,645
Marble Gall
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 2,642
Common Comfrey
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 2,637
Short-leaved Pocket-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 2,614
Hoary Ragwort
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,595
Golden Pigmy
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 2,586
Slender Bristle-moss
- Group
- Mosses
- Peak month
- February
- Records since 2000
- 2,581
White comfrey
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 2,573
Lesser Scaup
- Group
- Birds
- Peak month
- March
- Records since 2000
- 2,556
Phaonia tuguriorum
- Group
- True flies
- Peak month
- July
- Records since 2000
- 2,549
Apple of Peru
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 2,538
Italian Lords-and-Ladies
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 2,525
Floating Pennywort
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 2,498
Scented Mayweed
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,496
European physa, Tadpole snail, Bladder snail, Acute bladder snail, Pewter physa
- Group
- Molluscs
- Peak month
- October
- Records since 2000
- 2,479
Mottled Umber
- Group
- Butterflies and moths
- Peak month
- December
- Records since 2000
- 2,471
Campylomyza flavipes
- Group
- True flies
- Peak month
- December
- Records since 2000
- 2,470