Raphanus raphanistrum is an annual herb, to 80 cm, from a taproot, stems sparsely bristly-hairy, much branched, plant often dull blue-green.
Leaves alternate, lower leaves pinnately divided, to 20 cm long, widest near top, upper leaves reduced, sometimes entire.
Flowers yellow, often turning white, often with purple veins, 4-parted, 3-4 cm wide on stalks to 1.5 cm; blooming April-Nov.
Fruit dry capsules linear, to 4 x 0.6 cm, sometimes harshly-hairy, becoming constricted around the 2-10 seeds, tip beaked to 3 cm long, seeds 0.2-0.3 cm (Uva 1997).
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Habitat: Open soil, roadsides.