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Sinapis arvensis
The inflorescence is a raceme made up of yellow flowers having four petals. The fruit is a silique 3-5 cm long with a beak 1-2 cm long that is flattened-quadrangular. The valves of the silique are glabrous or rarely bristly, three to five nerved. The seeds are smooth 1-1.5 mm in diameter.
It grows in the plains and mountains, in pastures, fields, roadsides, waste places and ruins, but mainly in cultivated places.
A native of the Mediterranean basin, it is widespread in all temperate regions of the planet. It has also become naturalized throughout much of North America. It is a highly invasive species, a weed, such as in California. Not considered Spotted on the roadside of White Circle near storage buildings and unmaintained land.
Spotted on Feb 27, 2013
Submitted on Feb 27, 2013
2 Comments
Thanks! :)
I agree with you. A lot of mustards look alike, but you did a great job with your pictures. The hairy stems narrows it down some. The toothed, unlobed leaves in picture 4, and the deeply lobed lower leaves in picture 3 are what convinced me. Excellent series, and good ID!