The slideshow of signs of spring put together by NBC News makes clear that spring means different things in different places, from crocuses peeking out above the snow in Berlin, Germany (see slide 15) to beach-going in Florida (USA; see slide 6). In Washington, D.C., spring means cherry blossoms (slide 1, but see also slide 12).
Last year the Library of Congress presented an exhibit on the 100th anniversary of the city of Tokyo’s gift of 3,000 cherry trees to the city of Washington D.C. Two of those trees are on the grounds of the Library of Congress, including this one, as seen in a shot taken last Friday:
(Or in case you want to see a full tree in bloom, catch the Library of Congress blog posting here.)
From a botanical perspective, cherry trees are classed in 583.73 Rosales, where cherries are present in the including note. This number can be used to build several numbers in the 630s, of which the most appropriate for our purposes is 635.977373 (built from 635.977 Ornamental trees, plus notation 373 from 583.73, following the add instructions at 635.9773-635.9775). The Relative Index terms Cherries—ornamental arboriculture and Japanese flowering cherry both lead to 635.977373.