PCA Weed ID Questions with Comprehensive Rationales (2026/2027)

PCA Weed ID

Red Root Pigweed
Amarathaceae
Image: Red Root Pigweed


Yellow Starthistle
Asteraceae
Image: Yellow Starthistle


Hairy Fleabane
Asteraceae
Image: Hairy Fleabane


Canarygrass
Poaceae
Image: Canarygrass


Horseweed
Asteraceae
Image: Horseweed


Prickly lettuce
Asteraceae
Image: Prickly lettuce


Common Groudsel
Asteraceae
Image: Common Groudsel


Annual Sowthistle
Asteraceae
Image: Annual Sowthistle

, Coast Fiddleneck
Boraginaceae
Image: Coast Fiddleneck


Black Mustard
Brassicaceae
Image: Black Mustard


Shepherd's-Purse
Brassicaceae
Image: Shepherd's-Purse


London Rocket
Brassicaceae
Image: London Rocket


Common Chickweed
Caryophyllaceae
Image: Common Chickweed


Common Lambsquarters
Chenopodiaceae
Image: Common Lambsquarters


Russian Thistle
Chenopodiaceae
Image: Russian Thistle


Field bindweed
Convovulaceae
Image: Field bindweed


Morningglories
Convovulaceae
Image: Morningglories