Classification of plants by:
- absinth mugwort
- aster daisy michaelmas
- aster sea
- betterbur
- burdock greater
- burmarigold trifid beggarsticks
- canaryweed
- carthamus
- cat's ear
- cat's ear common
- chamomile corn
- chamomile stinking mayweed
- chamomile yellow
- chicory
- cocklebur rough - common
- colt's-foot
- coneflowers
- cornflower
- cosmos
- cudweed marsh
- daisy English
- daisy oxeye
- dandelion
- elecampane
- feverfew
- fleabane annual
- fleabane canadian horseweed marestail
- fleabane common
- fleabane flaxleaf
- globethistle great
- goldenrod canadian
- goosetongue yarrow
- groundsel common
- hawkbit bristly
- hawkbit lesser - hairy
- hawksbeard beaked
- hawksbeard marsh
- hawksbeard narrowleaf
- hawksbeard rough
- hawksbeard smoot
- hawkweed
- hawkweed common
- hawkweed mouseear
- hawkweed narrowleaf
- knapweed black
- lettuce prickly - China
- lettuce willowleaf
- marigold pot
- mayweed scented
- mayweed scentless
- mugwort
- nipplewort
- oxtongue bristly
- oxtongue hawkweed
- pinappleweed
- plains coreopsis calliopsis
- ragwort common
- ragwort Fuchs
- ragwort wood
- red-seeded dandelion
- salsify meadow goatsbeard
- scotch thistle
- snakeroot
- soldier gallant galinsoga
- soldier shaggy galinsoga
- sowthistle perennial
- sowthistle prickly spiney
- sowthistle smooth annual
- spikenard ploughman's
- sunflower
- tansy common
- thistle bull
- thistle cabbage
- thistle Canada
- thistle marsh
- thistle plumeless
- thistle St Marys
- viper's grass
- yarrow common - milfoil
- yarrow fernleaf
- bittercress common
- bittercress cuckooflower
- bittercress hairy
- bittercress wavy
- candytuft wild
- charlock mustard wild
- cress field
- cress hoary pepperwort
- damesrocket
- garlic mustard
- honesty
- horseradish
- mustard hedge
- mustard treacle
- pennycress field
- perennial honesty
- radish wild
- rapeseed
- rockcress hairy
- rockcress sand
- rocket intermediate - yellow
- rocket London
- rocket sand wall perennial
- rocket white
- rocket yellow
- shepherd's-purse
- sweet alyssum
- sweet alyssum
- swine-cress
- swine-cress lesser
- thale-cress
- watercress
- yellowcress Austrian
- acacia false
- broad-leaved everlasting-pea
- broom Scotch
- clover Berseem
- clover carnatio
- clover red
- clover white
- crownvetch common
- lucerne - alfalfa
- Meadow vetchling
- medic black
- melilot tall sweetclover
- melilot white sweetclover
- pea
- pea tuberous
- pea wood
- prosopis
- sweetclover field - yellow
- trefoil birdsfoot
- vetch bush
- vetch common
- vetch fodder
- bugle carpet
- crosne japanese artichoke
- deadnettle henbit
- deadnettle red - purple
- deadnettle spotted
- deadnettle white
- deadnettle yellow
- gipsywort bugleweed
- groundivy - creeping charlie
- hedgenettle betony
- hempnettle
- hempnettle common
- horse-mint
- marjoram
- mint corn
- mint water
- mint, pepper
- primrose common selfheal
- sage common
- sage wood
- shell flower
- skullcap common marsh
- stachys hedge
- thyme
- woundwort
- woundwort betony
- barley wall
- barley winter
- bentgrass
- bentgrass black
- bentgrass creeping
- bentgrass dog
- bermudagrass
- blackgrass
- bristlegrass foxtail green
- bristlegrass yellow pigeongrass
- brome barren
- brome rye - cheatgrass
- bromegrass field
- burrgrass spiny
- canarygrass
- cock's foot orchardgrass
- cockspur grass barnyardgrass
- couchgrass bearded
- couchgrass quackgrass wheatgrass
- eulaliagrass
- fescue alta tall
- fescue meadow
- fescue red
- fescue sheep
- fingergrass crabgrass hairy
- fingergrass crabgrass smooth
- fog creeping velvetgrass German
- foxtail bristly
- hairgrass wavy
- johnsongrass
- meadow bleugrass annual
- meadow bleugrass smooth
- moorgrass purple
- panicgrass millet proso
- paspalum
- quackinggrass - tottergrass
- reed common
- rye
- ryegrass Italian
- ryegrass perennial
- shattercane
- silkybent loose windgrass
- spelt
- timothy
- triticale
- velvetgrass common fog Yorckshire
- wheat
- wheat one-grained
- wildoat
- wiregrass goosegras
- bindweed black buckwheat wild
- bistort amphibious smartweed water
- bistort common
- dock broadleaved
- dock curled bitterdock
- fleece China
- knotgrass knotweed prostrate
- knotgrass tomentose
- knotweed Indian
- knotweed Japanese
- persicaria pale smartweed pale
- redshank smartweed ladsysthumb
- sorrel French
- sorrel green
- sorrell sheep's
- waterpepper
- eyebright common
- figwort common
- fluellen round-leaved
- foxglove
- monkey-flower yellow
- mullein black
- mullien common
- snapdragon dwarf
- snapdragon great
- speedwell corn
- speedwell creeping
- speedwell field
- speedwell germander
- speedwell ivy-leaved
- speedwell Persian
- speedwell spiked
- sticky bartsia glandweed yellow
- toadflax field
- toadflax ivyleaved
- toadflax prostrate
- toadflax yellow
- water figwort
- yellow-rattle greater
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centaurea nigra
Family
asteraceae
English name
knapweed black
French name
centaurée noire
Dutch name
knoopkruid zwart
German name
Flockenblume, Schwarze
International code
