all acacias contain sum DMT, maidenii being perhaps one of the more common of the really potent ones. Most acacias contain DMT in the bark, but a few also contain it in the leaves (such as maidenii and phlebophylla). Leaves are prolly better since removing bark from a tree will most likely kill it.
Acacia longifolia is VERY common, in WA it is a full on weed and councils spend fortune removing it ;-) the DMT is contained only in the bark and is not very potent.
I have tried phalaris extracts many times and it really sucks. the plant tissue is nearly impossible to grind up and conains mostly 5-MeO-DMT not NN-DMT which sucks donkeys balls!
Acacia maidenii is fairly easy to get if u know ur sources ;-) and is quite fast growing. Mine grew a metre in under year. There are also other non-native DMT plants which are easy to obtain such as psychotria spp. and desmanthus spp.
DMT is an abundant molecule and there are literally hundreds of thousands of usefull species both local and abroad :D