You're missing Sinmaker's Surprise from that list. It's plant based, DC 24, injury vector, does con damage (IIRC 2d6con/2d6 con, but it might be 1d6/2d6), and also adds 1d6 acid damage per round for three rounds. Explicitly made from extraplanar plants. Another amazing one comes from a specific demiplane, though I don't remember which one... but there are psionic apples. When eaten, they give a huge number of power points for use on a single power. Combo that with any Psion for endless power points (or with the various Psionic Vestiges for endless use of their powers).
JaronK