Torilis arvensis is an annual herb to 1 m tall, branching freely, stems rough-hairy.
Leaves alternate, 2-3 times pinnate, upper often once pinnate, lower pinnae stalked, ultimate segments small.
Flowers white, 5-parted, very small, in umbrella-shaped clusters (umbels) opposite a leaf, stalks 2-10 cm per inflorescence.
Fruit dry, oval, 0.3-0.5 cm covered with prickles almost 0.1 cm long, calyx teeth persistent.
Wetland status: NL.
Frequency in NYC: Very infrequent.
Habitat: Weedy, open or partly shaded habitats.
Notes: Apiaceae of open sites are eaten by larvae of the black swallowtail butterfly, Papilio polyxenes (Papilionidae); (Tallamy 2003; Pyle 1981).