[clmay]

Same score, and most of these plants aren't native here (W Oregon) and I wasn't familiar (in particular jack-in-the-pulpit got me 2/3 times, and then sarsaparilla appeared once).

I get asked to teach people plant ID sometimes, and people often seem mystified by it, until I explain the concept of "search image". It seems to give them a new way to approach it and seems helpful in most cases. Probably related to what you mean by "developing an instinct".