A new and distinct cultivar of Caladium plant named ‘CRM STR OF15-691’, characterized by its short and upright to mounding plant habit; dense and bushy appearance; vigorous growth habit and rapid growth rate; strap/lance-type leaves that are greenish white to lime green in color and variably flushed with dark pink, pale green-colored venation and variably tinged with greyish red, reddish brown or dark red, dark red-colored leaf petiole junction, and thin green-colored margins with dark red-colored edges; and petioles that are almost black in color with pale tannish pink-colored stripes or tannish pink and with brownish black-colored stippling and streaks.
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