Maori Party co-leader Te Ururoa Flavell said Dr Penfold's love of te reo and its place in New Zealand was implicit in everything she did.
"Her compassion for all people was obvious in her work in the area of human rights, as well as her absolute belief that human rights for all New Zealanders derive from the Treaty of Waitangi," he said.
"Na reira e te kuia, e te taonga a te mate, whakangaro atu ra ki te po e."
The Human Rights Commission also mourned Dr Penfold's death, chief commissioner David Rutherford saying she was an unforgettable person who had left an unforgettable legacy.
"The Commission remains indebted to this incredible woman's drive, focus and mana," he said.
A tribute posted on the Maori Maps Facebook page noted that Dr Penfold had attended Queen Victoria and Auckland Girls' Grammar schools, going on to teach throughout the Far North, the East Coast, central North Island, Ratana Pa and Poroporo.
She was one of the first Maori women to graduate from university (as a Bachelor of Arts).
'In her long life she worked hard and made a difference to her people,' the tribute continued. 'She was the first Maori woman elected to the University of Auckland Council. She also worked on the National Advisory Committee for Maori Education, the Broadcasting Commission, the Maori Unit of the New Zealand Council for Educational Research and the Maori Women's Welfare League.
'She chaired the management committee of the Te Hapua 42 Land Incorporation from 1976 to 1980, and was intimately involved in the Muriwhenua land and fisheries claims in the 1980s.
'In recent years she moved back to her home at Pukenui, although her daily life was punctuated by visits from people all over the country, seeking her advice and knowledge, including many of our team here at Maori Maps.
'In the 2010 film He Wawata Whaea - The Dream of an Elder, Merimeri said "I don't have any other ancestors, I am Ngati Kuri through and through." And it is to these ancestors she now returns.'