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Purple Pitcher Plant growing in a pond in Maine. Friend sent photos for ID. Photo credit: V. T.

Is a perennial, carnivorous plant in the New World Pitcher Plants (Sarraceniaceae) family that is native in Eastern North America, and is introduced/naturalized in California. It grows up to 8 inches tall in acidic seeps, marshes, and bogs, in wetland-riparian habitats. Leaves are ascending to nearly erect, green-yellow to deep red, and enlarged upward.
"Like other species of Sarracenia, S. purpurea obtains most of its nutrients through prey capture. However, prey acquisition is said to be inefficient, with less than 1% of the visiting prey captured within the pitcher. Even so, anecdotal evidence by growers often shows that pitchers quickly fill up with prey during the warm summer months. Prey fall into the pitcher and drown in the rainwater that collects in the base of each leaf. Prey items, such as flies, ants, spiders, and even moths or hornets, are then digested by an invertebrate community, made up mostly by the mosquito Wyeomyia smithii and the midge Metriocnemus knabi. The relationship between W. smithii and S. purpurea is an example of commensalism." https://www.inaturalist.org/taxa/52651-Sarracenia-purpurea
Conservation Status: Vulnerable (N3) in United States (NatureServe)

Calflora: (include species distribution map in CA): https://www.calflora.org/app/taxon?crn=7349

Jepson eFlora (includes botanical illustration): https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=43271