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Long- (A) and short-spurred flower (D) of Aquilegia rockii. Samples were collected by dissecting two parts of each flower for scanning electron microscopy: one third (1) and two thirds (2) of whole petal spur length, from the top to bottom position. Spur epidermis cells in L-1, top of long spur (B); L-2, bottom of long spur (C); S-1, top of short spur (E); S-2, bottom of short spur (F).
