Guild Wars 2

I am new to the ele and have a couple questions

What spells does the trait Persisting Flames effect (what spell is a fire field)?

What speed effects stack with eachother (signet of Air, Trait in lighting, Dagger speed Trait)?

Thanks

http://wiki.guildwars2.com/wiki/Fire_Field

and

http://wiki.guildwars2.com/wiki/Movement_speed

However I do want to point out, that personally when getting swiftness in town from an NPC (or the plant in The Grove) that this swiftness doesn’t stack in duration and a second swiftness from a skill can be applied, can’t say that I’ve tested it against someone with only the town buff but fairly certain I was moving much quicker than the normal swiftness at that time. So if twasn’t a bug then perhaps the wiki needs additional testing and some updating.