Nepenthes mirabilis (; from Latin mirabilis "wonderful"), or the common swamp pitcher-plant and tropical pitcher plant, is a carnivorous plant species. By far the most widespread of all Nepenthes, its range covers continental Southeast Asia and all major islands of the Malay Archipelago (minus the Lesser Sunda Islands and northern Philippines), stretching from China in the north to Australia in the south. The species exhibits great variability throughout its range. One of the more notable varieties, N. mirabilis var. echinostoma, is endemic to Brunei and Sarawak and possesses an extremely wide peristome. The conservation status of N. mirabilis is listed as Least Concern on the IUCN Red List. In Hong Kong, it is a protected species under Forestry Regulations Cap. 96A. According to Matthew Jebb and Martin Cheek, the pitchers of N. mirabilis are used as toy phallocrypts in New Guinea. Distribution Nepenthes mirabilis has by far the widest distribution of any Nepenthes species and is known from the following countries and regions: Australia (Cape York Peninsula), Borneo, Cambodia, Caroline Islands (Palau and Yap), China (Guangdong Province, Hainan, Hong Kong, and Macau), D'Entrecasteaux Islands, Java, Laos, Louisiade Archipelago, Maluku Islands, Myanmar, New Guinea, Peninsular Malaysia, Philippines (Dinagat and Mindanao), Sulawesi, Sumatra, Thailand, and Vietnam. It has also been recorded from many smaller islands, including Babi, Bangka, Banyak Islands, Batu Islands, Bengkalis, Enggano, Ko Lanta, Ko Tarutao, Langkawi, Mendol, Mentawai Islands (North Pagai, Siberut, Sipura, and South Pagai), Meranti Islands (Padang, Rangsang, and Tebing Tinggi), Nias, Penang, Phuket, Riau Islands (Lingga Islands and Riau Archipelago), Rupat, Tawi-Tawi, and possibly Wowoni. Taxonomy Nepenthes mirabilis is closely related to N. rowaniae, N. tenax and N. parvula, the only three Nepenthes species endemic to Australia. In his Carnivorous Plant Database, taxonomist Jan Schlauer treats N. kongkandana as a synonym of N. mirabilis. Infraspecific taxa Across its range, N. mirabilis exhibits great variability in terms of pitcher morphology and colour, and it has the most synonyms of all Nepenthes species. The following forms and varieties of N. mirabilis have been described. With the exception of N. mirabilis var. echinostoma and N. mirabilis var. globosa, these taxa are not considered valid today. Nepenthes mirabilis f. anamensis (Hort.Weiner) Hort.Westphal (1991) Nepenthes mirabilis var. anamensis Hort.Weiner in sched. (1985) nom.nud. Nepenthes mirabilis var. biflora J.H.Adam & Wilcock (1992) Nepenthes mirabilis var. echinostoma (Hook.f.) Hort.Slack ex J.H.Adam & Wilcock (1992) Nepenthes mirabilis var. globosa M.Catal. (2010) Nepenthes mirabilis f.