Louis XIV erected a C-shaped building at Versailles which stored these things in large boxes that could be wheeled around.  
William Wolfskill shipped an entire trainload of these things back east in 1862. These things are the most common product heated by a smudge pot.  Charles VIII kicked off a French mania for these things, constructing a pioneering building to house them at Amboise.  Louis XIV erected a C-shaped building at Versailles which stored these things in large boxes that could be wheeled around.  Another building named for these things now houses a panoramic view of (*) Monet's Water Lilies at the Louvre.  Seville lends its name to a particularly sour variety of this fruit often used to make marmalade.  The first ever advertisement for a raw agricultural product was in support of California-grown varieties of these things made by the Sunkist cooperative.  For 10 points, name this type of fruit, which comes in mandarin and navel varieties.
William Wolfskill shipped an entire trainload of these things back east in 1862.
oranges [or orange trees; or tangerines]