The National Park Service and the University of Arizona Herbarium have a long history of cooperation and collaborative works.

Recent collaborations include the National Park Service Legacy Project and National Park Service Imaging Project. The NPS Legacy Project has been a large-scale effort to locate, verify, and accession all plant specimens collected on NPS lands. There are a number of NPS-owned herbaria throughout the parks, but a large portion of specimens collected on NPS lands are located in other herbaria. ARIZ houses upwards of 6,000 NPS specimens all of which were pulled from the collection, verified for accuracy, and given an NPS accession sticker by ARIZ workers.

The NPS Imaging project involved ARIZ workers taking high-resolution photographs of all of the specimens from the southwestern national parks. The images are all available online at [link].