Extreme inflorescence-coloration variation of I. atrofusca. A. Inflorescence-coloration variation for the yellow-orange fall sepals, with maximum purple standard petals tinted orange at their base with dark brown background beneath an orangish beard. B. Inflorescence- coloration variation for the same clone which carries both white standards with light pastel magenta falls, and the dark brown-purple to nearly black fall petals and dark purple- brown standard petals.