I am unsure of its proper name, but by any name I loathe the weedy, vining, deciduous asparagus that frequently pops up uninvited in my garden, possibly bird-planted. It looks like an innocent, sweet, ferny green thing when young. However, if left unweeded it soon grows needle-like recurving spines along its stems. The nasty spines are the same color as the stems, so not particularly noticeable till one is stabbed. I've learned to use gloves and dig these out, no pulling lest I be bloodied by those spines. They are good at hiding under and behind other plants.

Like Laura's post, above, here's a shout-out for the lovely naked ladies, who never fail to appear in August!