The dude on the bike
Double Eagle Member
Riverside In My home town has stinging nettles on a few holes, they are nasty but the effects only last 10 minutes.
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Can't believe no one has been a smart-ass and said "mary jane" or something to that effect
Poison oak, which is endemic to northern california...
Since I do not react to poison ivy (knock on wood) I would have to say it is the pokey plants.
Funny Story:
I personally thought it was hilarious when I was at an Ace Race in Illinois last year and a number of people, including me, overshot the basket by a bit and ended up in a very large patch of poison ivy. I was wearing shorts and a tee-shirt and just walked right in like there was nothing there and didn't even get a tiny bit itchy from it. The guys I was with were looking at me like I was some kind of idiot lol.
In the separate world of course construction it's vines, not briars, that we curse. A small clearing project, tied together with vines, becomes a nightmare.