Question: Robinson's Onion grows in Ferry County in a specific state; what is the capital of that state?

full_context: Document 1: Northwestern United States: The Northwestern United States is an informal geographic region of the United States. The region consistently includes the states of Oregon, Washington, and Idaho—and usually Montana and Wyoming. Some sources include southeast Alaska in the Northwest. The related but distinct term "Pacific Northwest" generally excludes areas from the Rockies eastward.
Document 2: Seattle: Seattle ( ) is a seaport city on the west coast of the United States. It is the seat of King County, Washington. With an estimated 704,352 residents as of 2016 , Seattle is the largest city in both the state of Washington and the Pacific Northwest region of North America. In July 2013, it was the fastest-growing major city in the United States and remained in the Top 5 in May 2015 with an annual growth rate of 2.1%. In July 2016, Seattle was again the fastest-growing major U.S. city, with a 3.1% annual growth rate. The city is situated on an isthmus between Puget Sound (an inlet of the Pacific Ocean) and Lake Washington, about 100 mi south of the Canada–United States border. A major gateway for trade with Asia, Seattle is the fourth-largest port in North America in terms of container handling as of 2015 .
Document 3: Petrophytum cinerascens: Petrophytum cinerascens (orth. var. "Petrophyton cinerascens") is a rare species of flowering plant in the rose family known by the common names halfshrub rockmat and Chelan rockmat. It is endemic to the state of Washington in the United States, where it occurs in just a few locations along the Columbia River in Chelan and Douglas Counties.
Document 4: Eriogonum codium: Eriogonum codium is a species of wild buckwheat known by the common names basalt desert buckwheat and Umtanum Desert wild buckwheat. It is endemic to Washington in the United States, where it is known only from Hanford Reach National Monument in Benton County. It was discovered in 1995 during an inventory of the biodiversity of the monument and described to science in 1997.
Document 5: Columbia Basin pygmy rabbit: The Columbia Basin pygmy rabbit is an isolated population of pygmy rabbit ("Brachylagus idahoensis"), that is native only to a single Columbia Basin area of Washington state. The Columbia Basin pygmy rabbit is the smallest North American rabbit. While the IUCN considers the species as a whole to be of least concern, the US Fish & Wildlife Service considers this a distinct population segment, and as thus merits protections under the Endangered Species Act. The last purebred Columbia Basin pygmy rabbit died in 2008, marking the end of the pure genetic line.
Document 6: Allium campanulatum: Allium campanulatum is a species of wild onion known by the common name dusky onion or Sierra onion. This is a flowering plant native to the western United States from southeastern Washington and northern Oregon to southern California, and western Nevada. The dusky onion grows in foothills and mountains, especially in dry areas, such as chaparral habitats.
Document 7: Pacific Northwest: The Pacific Northwest (in the United States, commonly abbreviated as PNW), sometimes referred to as Cascadia, is a geographic region in western North America bounded by the Pacific Ocean to the west and (loosely) by the Cascade Mountain Range on the east. Though no agreed boundary exists, a common conception includes the U.S. states of Oregon and Washington and the Canadian province of British Columbia. Broader conceptions reach north into Alaska and Yukon, south into northern California and east to the Continental Divide, thus including Idaho, Western Montana, and western Wyoming. Idaho, Wyoming, and Montana are more accurately termed the Inland Northwest (INW), as the climate, folia, fauna, and politics are different than in the Pacific Northwest, as well as a different time zone in all but North Idaho. Narrower conceptions may be limited to the northwestern US or to the coastal areas west of the Cascade and Coast mountains. The variety of definitions can be attributed to partially overlapping commonalities of the region's history, geography, society, and other factors.
Document 8: Lomatium bradshawii: Lomatium bradshawii, also known as Bradshaw's desert parsley, is an endangered perennial herb native to Oregon and Washington, United States. "Lomatium bradshawii" was thought to be extinct until 1979, when it was rediscovered by a University of Oregon graduate. This herb was common in the Willamette Valley before agricultural development and fire prevention which has allowed shrubs and weeds to invade. Most known populations of "Lomatium bradshawii" are within ten miles of Eugene, Oregon. In the Willamette Valley, populations exist in the Oregon counties Lane, Benton, Linn, and Marion, and in Washington "Lomatium bradshawii" grows in Puget Sound. The largest population of this herb is in Camas Meadows, Washington, with a population of 10,7900,00 +/- 2,010,000, and the Berry Botanic Garden keeps a seedbank.
Document 9: Vancouver, Washington: Vancouver is a city on the north bank of the Columbia River in the U.S. State of Washington, and the largest suburb of Portland, Oregon. Incorporated in 1857, it is the fourth largest city in the state, with a population of 161,791 as of April 1, 2010 census. Vancouver is the county seat of Clark County and forms part of the Portland-Vancouver metropolitan area, the 23rd largest metropolitan area in the United States. Originally established in 1825 around Fort Vancouver, a fur-trading outpost, the city is located on the Washington–Oregon border along the Columbia River, directly north of Portland. In 2005, "Money" magazine named it No. 91 on its list of best places in America to live. In 2016, WalletHub ranks Vancouver the 39th best place to live for families in the US.
Document 10: Campanula robinsiae: Campanula robinsiae is a rare species of flowering plant in the bellflower family known by the common names Brooksville bellflower, Robins' bellflower, and Chinsegut bellflower. It is endemic to Florida, where it is known from four or five occurrences in Hernando and Hillsborough Counties. Its population has fluctuated throughout the years; at one point in the early 1980s it was feared extinct. Today there are two populations in Hernando County and probably three in Hillsborough River State Park. At the time the plant was listed as an endangered species of the United States in 1989, it was known from three small populations on wet prairies that were threatened by changes in the local hydrology and by pollution. It was also thought to be threatened by vandalism, trampling, and collecting by flower enthusiasts. Cattle grazing and invasion of the habitat by the exotic skunkvine ("Paederia foetida") also degrade the habitat.
Document 11: Washington (state): Washington ( ), officially the State of Washington, is a state in the Pacific Northwest region of the United States. Named after George Washington, the first President of the United States, the state was made out of the western part of the Washington Territory, which had been ceded by Britain in 1846 in accordance with the Oregon Treaty in the settlement of the Oregon boundary dispute. It was admitted to the Union as the 42nd state in 1889. Olympia is the state capital. Washington is sometimes referred to as Washington State to distinguish it from Washington, D.C., the capital of the U.S., which is often shortened to Washington.
Document 12: Olympia, Washington: Olympia is the capital of the U.S. state of Washington and the county seat of Thurston County. It was incorporated on January 28, 1859. The population was 46,478 as of the 2010 census. The city borders Lacey to the east and Tumwater to the south. Olympia is a major cultural center of the Puget Sound region. Olympia is located 60 mi southwest of Seattle, the largest city in the state of Washington, and falls within the borders of the Seattle CSA.
Document 13: Allium robinsonii: Allium robinsonii, the Columbia River onion or Robinson's onion, is a rare plant species native to the US States of Washington and Oregon, although some studies suggest that the Oregon populations may now be extinct. The species has been reported from 5 counties in Washington (Ferry, Yakima, Grant, Franklin and Benton) and 5 in Oregon (Umatilla, Morrow, Gilliam, Sherman and Wasco). It is found in sand and gravel deposits along the lower Columbia River and some of its tributaries, usually at elevations less than 200 m. The species is also cultivated as an ornamental in other regions, including in Europe.
Document 14: University of Washington: The University of Washington (commonly referred to as UW, simply Washington, or informally "U-Dub") is a large, public flagship research university in Seattle, Washington, established in 1861.
Document 15: Orontium wolfei: Orontium wolfei is an extinct golden-club species in the family Araceae described from a series of isolated fossil leaves. The species is known from Eocene sediments exposed in the state of Washington in the United States of America and the province of British Columbia in Canada. It is one of several extinct species placed in the living golden-club genus "Orontium".
ground_truth: Olympia