On her way out of the party-room meeting that returned Christine Milne as Greens leader on Monday morning, Senator Sarah Hanson-Young walked past a table of journalists at Aussies Cafe at Parliament House.

To their bewilderment, Senator Hanson-Young matter-of-factly announced that her party had just returned a leader that would see the party ''marching to a slow death''.

Torn loyalties: Greens MP Adam Bandt, party leader Christine Milne and senator Sarah Hanson-Young.

After the election, at which the Greens bled a third of their vote, recriminations within the party have been swift. There is clear disquiet in the party's senior ranks about Senator Milne's leadership, but for the first time, it is out in the open. It was revealed last week six of the party's 18 most senior staffers, including Senator Milne's chief-of-staff Ben Oquist, had left.

One Greens senator told Fairfax Media: ''I believe all this [leadership speculation] is because there are concerns about where [Senator Milne] takes us in the next three years. If we have the same result we had this election, we will be gone; we can't afford to do it again.''