Lupinus perennis (also wild perennial lupine, wild lupine, sundial lupine, blue lupine, Indian beet, or old maid's bonnets) is a medicinal plant in the Fabaceae family.
 It is widespread in the eastern part of the USA (from Texas and Florida to Maine) and Minnesota, Canada (southern Ontario, Newfoundland and Labrador), and on the coasts of the Arctic Ocean, where it grows on sand hills and roadsides.
The Dutch Alcon blue ("Phengaris alcon arenaria") was a subspecies of the Alcon blue butterfly ("Phengaris alcon").
 There is not much known about this subspecies, but it has always been very rare.
 It was endemic to the Netherlands, where two populations were known.
 One in Meijendel (dunes north of The Hague), and in the Meije (in the neighbourhood of the Nieuwkoopse Plassen).
 The population in the Meije disappeared in 1975 and in Meijendel this subspecies disappeared in 1979.
The Karner blue ("Plebejus melissa samuelis") is an endangered subspecies of small blue butterfly which was once found in significant numbers in the Miller section of Gary, Indiana community of the Indiana Dunes National Park.
 The butterfly is now mainly found in other parts of the Great Lakes states, such as Wisconsin and Michigan, in small areas of New Jersey, and also in southern New Hampshire, and the Capital District region of New York.
 The butterfly, whose life cycle depends on the wild blue lupine flower ("Lupinus perennis"), was classified as an endangered species in 1992.
 In May 2000, the Canadian Species at Risk Act listed the Karner blue as being locally extinct in Canada.
 This subspecies of "Plebejus melissa" was described by novelist Vladimir Nabokov.
The U.S. Fish and Wildlife Service (USFWS) has a number of programs aimed at Mission blue butterfly habitat conservation, which include lands traditionally inhabited by the Mission blue butterfly, an endangered species.
 A recovery plan, drawn up by the U.S. Fish and Wildlife Service in 1984, outlined the need to protect Mission blue habitat and to repair habitat damaged by urbanization, off highway vehicle traffic, and invasion by exotic, non-native plants.
 An example of the type of work being done by governmental and citizen agencies can be found at the Marin Headlands in the Golden Gate National Recreation Area.
 In addition, regular wildfires have opened new habitat conservation opportunities as well as damaging existing ones.
Lupinus elatus is a species of lupine known by the common name tall silky lupine.
 It is endemic to California, where it is known from the Transverse Ranges above Los Angeles, and possibly also from the southernmost slopes of the Sierra Nevada.
 Its habitat includes dry areas in the forests of the mountains.
 This is an erect perennial herb reaching a maximum height near 90 centimeters.
 Each palmate leaf is made up of 6 to 8 leaflets up to 8 centimeters long.
 The herbage is coated in silvery silky to woolly hairs.
 The inflorescence is a long raceme of flowers, each about a centimeter long and arranged in whorls.
 The flower is purple or blue with a pale yellow patch on its banner.
 It yields a legume pod 2 or 3 centimeters long.
 This is a host plant to the Southern California native butterfly subspecies known as the San Gabriel Mountains Arrowhead Blue ("Glaucopsyche piasus" ssp.
 "gabrielina").
Canoe Landing Prairie is a Wisconsin Department of Natural Resources-designated State Natural Area featuring a diverse Hill's oak barrens and prairie community growing on the gently rolling, sandy uplands near the Eau Claire River.
 Plant composition includes the following species: Big bluestem, side-oats grama, butterfly weed, blue toadflax, and birdsfoot violet.
 Wild lupine is also found in the prairie, and supports a population of the karner blue butterfly, an endangered species whose caterpillars feed solely on wild lupine.
The Melissa blue ("Plebejus melissa") is a butterfly of the family Lycaenidae.
 It is found in western North America, from Canada to Mexico.
 The Karner blue ("Plebejus melissa samuelis") is a subspecies of the Melissa blue, and was described by the novelist/lepidopterist Vladimir Nabokov.
The Wild Blue Yonder (a.k.a.
 The Wild Blue Yonder, The Story of the B-29 Superfortress) is a 1951 war film directed by Allan Dwan.
 (The film was re-released in 1958.)
 The film stars Wendell Corey, Vera Ralston, Forrest Tucker and Phil Harris.
 "Wild Blue Yonder" deals with the Boeing B-29 Superfortress air raids on Japan during World War II.
Fender's blue butterfly ("Icaricia icarioides fenderi" syn.
 "Plebejus icarioides fenderi") is an endangered subspecies of butterfly endemic to the Willamette Valley of northwestern Oregon, United States.
 The species was first documented in the 1920s and was described to science in 1931 by biologist Ralph Macy.
 He named it for his friend, Kenneth Fender, an entomologist and mail carrier.
 The species was not seen after the 1930s and was presumed extinct.
 Small populations were rediscovered in 1989.
 Its eponym, Fender, had died nine years earlier.
 In January 2000, Fender's blue butterfly was added to the Endangered Species List by the U.S. Fish and Wildlife Service.
 The largest known populations now exist in the Baskett Slough National Wildlife Refuge.
 A 2014 study reintroduced this species to William L. Finley National Wildlife Refuge.
Lupinus breweri is a species of lupine known by the common names Brewer's lupine and matted lupine.
 It is native to much of California, except for the deserts, and to adjacent sections of Oregon and Nevada, where it is common in some areas, particularly mountain forests.
 Quite short for a lupine, this is a hairy, mat-forming perennial herb, sometimes becoming like a shrub, with a woody base.
 The leaves spread out from the stem.
 Each palmate leaf is made up of 5 to 10 woolly leaflets each up to 2 cm long.
 The inflorescence is a dense raceme of flowers a few centimeters tall, each flower 4 to .
 The flower is blue or purple with a white or yellowish spot on the banner.
 The fruit is a silky-hairy legume pod 1 or long.

Question: Which subspecies of the Melissa blue butterfly depends on the wild blue lupine flower for survival?
Answer: Karner blue