Recursion - Concatenation On Database?

We are using Oracle 11g (11.1.0).I'm not all that prolific when it comes to writing queriesI have a table...

Table1
-----------------------------------------
oid narr parent
-----------------------------------------
1 some narrative null
2 more narrative 1
3 a bit of test narrative 2

Simply put, I need a query that will recurse up through each rows parent and return the concatination of all parents and itself narrative.

Expected output
------------------------------------
some narrative
more narrative some narrative
a bit of test narrative more narrative some narrative

The requirement is that this is one single query as it will be called from a third party application we are using. We need this recursion and concatenation to be done on the database, as while we have control over the database queries that get executed we have no control over the internal source of this third party applications.I have been digging around for a bit, I have tried using a combination of JOINS and UNIONS but keep hitting a brick wall.

The best I could come up with is...
SELECT concat(n1.narr, n2.narr) FROM table1 n1
JOIN table1 n2 ON n1.oid = n2.parent

But this only returns two lines, for oid's 2 and 3, and only concatinates with the immediate parent.