Seedling
Everyone gets this rank when they join, it has all the basic commands you need.
Daisy
3 sethomes
Commands: seen, dcport (teleport to deathchest), seen, workbench
Sunflower
5 sethomes
Commands: suicide, warp, hat, jump, nick (no color), enderchest
Azalea
7 sethomes
Commands: fly, feed
Orchid
10 sethomes
Commands: speed, top, god (overworld only), nv, and color chat
Allium
Unlimited sethomes
Commands: gmc (restricted creative), beezooka, kittycannon