Thyridia repens, syn Mimulus repens, purple musk, Maori musk, or native monkey flower is indigenous to New Zealand, and is found in the North and South Islands. It is also found in Tasmania, Australia. This naturally uncommon species is founding damp coastal sand or wet muddy margins of estuaries and lagoons.

It is a small, soft, hairless, rather succulent creeping perennial herb, with prostrate or rising branches up to 15cm long and tiny leaves. It has large flowers for the size of the plant that can be up to 15mm across. The flowers are pale purple with a yellow throat that sometimes bleach to white, and appear from October through to March.