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Cordyline stricta was created in 1825.
Cordyline congesta was created in 1827.
Cordyline fruticosa was created in 1759.
A cordyline will develop a stem whereas phormiums don't.
A fungus on a canary palm tree can be treated with dusts or sprays designed for these palm trees. Check for one that is specially formulated to kill fungus on trunks of trees and branches.
Sago is a powdery starch made from the processed pith found inside the trunks of the Sago Palm ;)
http://www.unce.unr.edu/publications/files/ho/2004/sp0416.pdf#search="prune palms"
Cordyline native plants are located in New Zealand. It is also known as the Cabbage tree. There are many sites that teach you how to grow them properly.
cordyline australis
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