Malva neglecta (and Malvaparviflora) are edible. Palestinians in Gaza are eating Malva neglecta to during Israel's siege. According to one non-medical site, its health benefits are that:
It's high in B vitamins A, C and folate.
The mucous substances can be used to help coughs and other respiratory problems.
The leaf extracts have anti-inflammatory and antioxidant activity, that can be used in treatment of some inflammatory disorders.
The leaves can also be used to sooth bites from insects or any wound.