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

Context paragraphs:
Republic, Washington: Republic is a city in Ferry County, Washington, United States.  The population was 1,073 at the 2010 census, a 12.5% increase over the 2000 Census.  It is the county seat of Ferry County.

Ferry County, Washington: Ferry County is a county located in the U.S. state of Washington.  As of the 2010 census, the population was 7,551, making it the fourth-least populous county in Washington.  The county seat and largest city is Republic.  The county was created out of Stevens County on February 21, 1899 and is named for Elisha P. Ferry, the state's first governor.

Keller Ferry: Keller Ferry (occasionally called Clark Ferry), is a ferry crossing on Franklin D. Roosevelt Lake in the US state of Washington.  The crossing connects the northern and southern segments of State Route 21, between The Colville Indian Reservation in Ferry County and Clark in Lincoln County.  The ferry run has been in operation since the 1890s and under state control since 1930.  During that time, five vessels have served the crossing, including the Martha S., which operated from 1948 to 2013, and the current ferry, the M/V "Sanpoil".

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.

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.

Abies milleri: Abies milleri, an extinct species of fir known from fossil remains found in deposits from the early Eocene Ypresian stage (around 49.5 mya) in Washington State, USA, is the oldest confirmed record for the fir genus.  The species was described from 81 fossil specimens collected from Burke Museum site number A0307 in Ferry County, Washington.  The holotype specimen, number # "UWBM 31299", and the eleven paratype specimens are currently deposited in the collections of the Burke Museum in Seattle, where they were studied and described by Howard E. Schorn and Wesley C. Wehr.  Schorn and Wehr published their 1986 type description for "A. milleri" in the "Burke Museum Contributions in Anthropology and Natural History", Volume 1.  The specific epithet, "milleri", was coined in honor of Charles N. Miller Jr for his contributions to the study and understanding of the conifer family Pinaceae.  The studied specimens were excavated from the Tom Thumb Tuff member of the Klondike Mountain Formation in the city of Republic.

Ferry, Washington: Ferry is a ghost town in Ferry County, Washington, United States.  Ferry was founded during the late 1890s.  The town was located to the west of Vulcan Mountain.  Ferry was a ramshackle collection of crude log homes and false front buildings to support the mining boom in the area.  By 1910 insurance fires took their toll and before long Ferry had passed into oblivion.  Today little remains of the town.

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.

Ferry County Carousel: The Ferry County Carousel is an operational wooden carousel located three miles (5 km) east of the town of Republic, Washington on the Ferry County Fairgrounds.  This carousel features 24 horses in two rows and is fitted with a jumping mechanism.  The Ferry County Carousel is one of only seven classic wooden carousels in Washington state and possibly the oldest.

Danville, Washington: Danville is an unincorporated community and census-designated place (CDP) in Ferry County, Washington, United States.  Danville is located on Washington State Route 21 near the Canada–United States border, 31 mi north-northeast of Republic, the Ferry County seat.  Danville has a post office with ZIP code 99121.  The population at the 2010 census was 34.

Supporting paragraphs: Allium robinsonii Washington (state)
Answer: Olympia