Seed mimicry in plants

The kind of mimicry I mentioned yesterday, with weeds growing to look like crops, is called Vavilovian mimicry; the wikipedia article has a couple of neat examples. A brief paper on this, which is still apparently one of the longer treatments, is Barrett, S. (1983) Crop Mimicry in Weeds. Economic Botany. 37:255–282. There's a horrible scanned pdf of it available here.