Indigenous senator Dorinda Cox has been censured by the Greens WA over bullying allegations.

Western Australian Greens officials will investigate the complaints and the party asked any others affected to come forward in an email sent to members this weekend and seen by the National Indigenous Times.

The Greens formally censured Senator Cox after former staff came forward with allegations of bullying by the senator.

The email to members sent by Greens WA co-conveners Chloe Durand and Nat Tang and state director Dean Smith began: "Many of you are aware of the number of recent news stories reporting on alleged workplace bullying by Senator Dorinda Cox."

"Any allegation of bullying and misconduct from a member of our party, especially one with a position of power and influence, is cause for grave concern. We place great trust in our MPs to represent the interests of the Party's grassroots, and we expect all our MPs to conduct themselves in line with Greens' values," they wrote.

"Senator Cox has been issued a censure by our Representatives Council's Quick Decision Making Group. This falls under the Greens (WA) Censure, Suspension and Expulsion By-Laws for matters relating to the effect of these news articles and allegations on the Party and its members."

The email noted that "many of the people who have been on record or named in these articles are active contributors to the Greens".

"We're deeply saddened to hear of their experiences both in the movement, and in navigating the Parliamentary Worker Support System (PWSS)," the three officials wrote.

"We wish to express our support for those who have spoken up and for any others who are considering doing so."

The Greens WA officials noted that the WA party's "principles and rules... bind all members equally, MPs included".

"We are committed to the investigation of any allegations, a fair outcome, and to supporting people impacted by any such behaviour," they wrote.

The officials also noted that the Greens (WA) owes a duty of care to members and volunteers, under the Work Health and Safety Act 2020 (WA).

"Under the Act, our staff, members and volunteers have the same rights to workplace health and safety in the Party. Further, members' Freedom of Expression is a principle codified in s17 of the Greens (WA) Constitution," they wrote.

"All workers deserve safe workplaces, and all members and volunteers deserve a safe Party. For us, this is not merely a policy or platform, it's a deeply held principle. Safety in the workplace is something we will act on, not just campaign on.

"We would also reject any argument, should it be made, that political work is intrinsically toxic, and that as a result, toxic behaviour should be expected. Any instance of bullying brings the entire party into disrepute."

The Greens WA co-convenors and state directors said the integrity and safety of the movement are paramount.

"The strength of the Greens movement is found in the people who pour time and energy into making our campaigns, Party offices, committees, regional groups and many important projects happen. To 'do politics differently' means to value this above all else," they wrote.

"We'd like to invite our members and supporters to let us know if this issue has affected you."

The letter included an email address for raising concerns and seeking support, and the telephone number of an employee assistance program

The move to censure and investigate Senator Cox comes after she apologised on Friday for any "shortcomings" demonstrated while in office.

"I take responsibility for any shortcomings in what has occurred during this period and I apologise," she said.

Federal Greens parliamentary leader Adam Bandt has to date largely left the matter to the Parliamentary Workplace Support Service.

Senator Cox, the federal Greens' First Nations and resources spokesperson, said on Sunday she was disappointed the party had not contacted her before the decision was made to censure her.

"I do find it disappointing such a provisional decision has been made on the basis of allegations reported in the media without even being asked to participate in the meeting or informed in any way of the process. I have requested that the WA party consult with the PWSS before taking any further actions. They are the appropriate body to address these matters," she said, the Sydney Morning Herald reports.

The Weekend Australian reported on Saturday that the Greens faction representing Indigenous members of the party opposed Senator Cox's appointment as the party's First Nations spokesperson after Lidia Thorpe quit the party, amid concerns about her interactions with senior Indigenous leaders and her own staff.

A WA Greens meeting is expected to approve the censure motion later this month, but it is unclear what practical ramifications the measure has given the Greens WA constitution does not specify further consequences of a formal censure of a party member.