Question: Where are the cousins of the species of nukupuʻ located other than the oldest of the main Hawaiian Islands?
Context: Sesbania tomentosa, commonly known as Oahu riverhemp and ʻ Ōhai, is an endangered species of flowering plant in the pea family, Fabaceae, that is endemic to the main Hawaiian Islands as well as Nihoa and Necker Island.  It inhabits low shrublands and, rarely, dry forests, at elevations from sea level to 2500 ft .  Associated native plant species include akiʻ aki ("Sporobolus virginicus"), ilima ("Sida fallax"), naupaka kahakai ("Scaevola taccada"), and pili ("Heteropogon contortus").  Off-road vehicles, wildfires, grazing, and alien species competition have destroyed their habitat on the main islands, but they are still quite common on Nihoa and Necker.  At least 2000 specimens grow on Nihoa, while there are far less on Necker. The Oʻ ahu nukupuʻ u ("Hemignathus lucidus") was a species of nukupuʻ u which was similar to its cousins from the Islands of Kauaʻ i and Maui. Touchardia latifolia, commonly known as olonā in Hawaiian, is a species of flowering shrub in the nettle family, Urticaceae.  "T. latifolia" is endemic to Hawaii and inhabits mesic valleys and wet forests at elevations of 70 - .  Typical to many Hawaiian plants, the olonā does not have the stinging hairs of its mainland cousins.  It is found on all the main Hawaiian islands except Kahoʻ olawe and Niʻ ihau.  Olonā has alternate leaves whose shape greatly varies depending upon the environment from thin lancolate to broad elliptic.  The large range in leaf variation once divided "T. latifolia" into more than 10 species, which are currently considered to be one.  Olonā typically flowers between the months of May through December The female flowers are borne on branching cymes which become fleshy orange berry-like achenes, and the male flowers are white.  Olonā is easily cultivated (83% germination rate), and sprouts readily from cuttings, but does not transplant well due to its fragile roots. Molokai ( ; Hawaiian: ] ), nicknamed “The Friendly Isle” is the fifth largest island of eight major islands that make up the Hawaiian Island Chain in the middle of the Pacific Ocean.  It is 38 by 10 miles (61 by 16 km) in size at its extreme length and width with a usable land area of 260 sqmi , making it the fifth-largest of the main Hawaiian Islands and the 27th largest island in the United States.  It lies east of Oahu across the 25-mile (40 km) wide Kaiwi Channel and north of Lānai, separated from it by the Kalohi Channel. The Vicar Apostolic of the Hawaiian Islands was the prelate having ordinary jurisdiction of the "Vicariate Apostolic of the Hawaiian Islands".  The Vicariate Apostolic of the Hawaiian Islands was created by the Holy See in 1847 as the Vicariate Apostolic of the Sandwich Islands.  In 1848, the phrase "Sandwich Islands" was dropped and replaced by "Hawaiian Islands."  The first Vicar Apostolic of the Sandwich Islands (and the Hawaiian Islands) was Msgr. Louis Desiré Maigret, SS.CC.  The Vicariate derives from the Prefecture Apostolic of the Sandwich Islands, established in 1825 and which was to become in 1833, a part of the larger territory under the ordinary jurisdiction of the Vicar Apostolic of Oriental Oceania entrusted to the Congregation of the Sacred Hearts of Jesus and Mary. The Maui nukupuʻ u ("Hemignathus affinis") is a species of nukupu‘u Hawaiian honeycreeper that is endemic to the island of Maui in the Hawaiian Islands.  The small, five-inch-long bird lives only in eastern Maui, where it is dependent on high-elevation mesic and wet forests of ʻ ōhiʻ a lehua ("Metrosideros polymorpha") and koa ("Acacia koa").  These two species of trees attract insects, causing the Maui nukupuʻ u to have a higher chance of finding a meal near these trees. Microlepia strigosa, known as hay-scented fern, lace fern, rigid lace fern and palapalai in Hawaiian, is a fern indigenous to the Hawaiian islands and is also native to other parts of the tropics and subtropics including India and Malaysia.  This fern belongs to a group of about seventy "Microlepia" species in the bracken or hay-scented fern family (Dennstaedtiaceae).  There are two indigenous species and a hybrid found in the main Hawaiian Islands.  It is also known by the botanical names: "Davallia hirta", "Davallia setosa", "Davallia strigosa", "Dicksonia kaulfussiana", "Dicksonia strigosa", "Microlepia hirta", "Microlepia setosa", "Stenoloma tenuifolium", "Trichomanes strigosum".  It has coarse, light to medium green fronds which can grow to more than 3 feet long. Cuscuta sandwichiana ("Kauna'oa kahakai") is a parasitic vine and the only member of the genus Cuscuta that is endemic to the Hawaiian Islands.  It parasitizes a wide variety of indigenous, endemic and introduced plants on all of the main Hawaiian islands.  It grows in coastal areas with sandy soils from sea level elevation to 975 feet.  The indigenous "kaunaʻoa pehu" (literally "swollen kaunaʻoa") Cassytha filiformis is a similar looking species with the same parasitic nature.  It is an unrelated plant in the Laurel family Lauraceae which can be distinguished by it larger, coarser yellowish-green stems. Kauai or Kauaʻ i ( ; ] ) is geologically the oldest of the main Hawaiian Islands.  With an area of 562.3 sqmi , it is the fourth largest of these islands and the 21st largest island in the United States.  Known also as the "Garden Isle", Kauaʻ i lies 105 mi across the Kauaʻ i Channel, northwest of Oʻ ahu.  This island is the site of Waimea Canyon State Park. The Aliʻ i nui were high chiefs of the four main Hawaiian Islands.  The rulers of Molokai, like those of the other Hawaiian islands, claim descent from god Wākea.
Answer: Maui