Uhmm: google.com dogpile.com yahoo.com msn.com searchengine.com yeah alot of places just write "plants"
I find wikipedia is a useful resource for plants. Namely for plant families, they're not the best when it comes to specific species. If you need some help on more specific stuff, feel free to PM me. I work in a nursery.
ack! NO! no wikipedia, it is not a good source you cna't use it in college so dont get in the habbit now. best bet is the plants.usda.gov probably wikipedia can be posted on by any idiot who wants to.
Actually, one could technically use wikipedia while in college/university (not directly) - the wiki pages usually have cited references at the bottom, and you could use those - though you'll want to make sure they are peer-reviewed articles and what not if that is what your professors are looking for.
They tested this. They changed the name of The other guy (moon landing)'s wife's name, and it was changed back in 31 minutes. It's pretty damn accurate.