Senecio
- threadleaf groundsel
Bluish-green bushy leafy plant covered with close white wool and bearing branched...
- ragweed
Widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and...
- groundsel
Eurasian weed with heads of small yellow flowers.
Also contains
- thistle
Any of numerous plants of the family Compositae and especially of the genera Carduus and...
- nettle
Any of numerous plants having stinging hairs that cause skin irritation on contact (especially...
- ambrosia
Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that...
- pennycress
Any of several plants of the genus Thlaspi.
- fireweed
An American weedy plant with small white or greenish flowers.
- wormseed mustard
Slender yellow-flowered European mustard often troublesome as a weed; formerly...
- jointed charlock
Eurasian weed having yellow or mauve or white flowers and podlike fruits.
- knawel
Widely distributed low-growing Eurasian herb having narrow leaves and inconspicuous green...
- bastard feverfew
Tropical American annual weed with small radiate heads of white flowers; adventive...
- Barnaby's thistle
European weed having a winged stem and hairy leaves; adventive in the eastern...
- corn spurry
Small European weed with whorled leaves and white flowers.
- wild parsnip
Biennial weed in Europe and America having large pinnate leaves and yellow flowers...
- sand spurry
Prostrate weedy herb with tiny pink flowers; widespread throughout Europe and Asia on...
- bitterweed
Widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized...
- rockcress
Noxious cress with yellow flowers; sometimes placed in genus Sisymbrium.
- orange hawkweed
European hawkweed having flower heads with bright orange-red rays; a troublesome...
- cocklebur
Any coarse weed of the genus Xanthium having spiny burrs.
- carpetweed
Annual prostrate mat-forming weed having whorled leaves and small greenish-white flowers;...
- king devil
European hawkweed introduced into northeastern United States; locally troublesome we...
- horseweed
Common North American weed with linear leaves and small discoid heads of yellowish flowers;...
- alligator weed
Prolific South American aquatic weed having grasslike leaves and short spikes of...
- tumbleweed
Any plant that breaks away from its roots in autumn and is driven by the wind as a light...
- cat's-ear
European weed widely naturalized in North America having yellow flower heads and leaves...
- corn cockle
European annual having large trumpet-shaped reddish-purple flowers and poisonous seed;...