Are there other plants that make heat metabolically rather than just focusing light like Ranunculus or trapping heat in a greenhouse like Rheum nobile? What is the purpose of salicylic acid in a willow? (yeah, treating their headaches...) Jane Sargent _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…