It has 2 pairs of petals, 3 large sepals (outer petals), known as the 'falls' and 3 inner, smaller petals (or tepals, known as the 'standards'.[16] The falls have a deflexed, rounded blade, 3–8 cm (1–3 in) long,[2][3] with a yellow, cream or white centre that is heavily veined with purple or blue-violet.[4][5][6] Behind the blade, it has a longer law (part of the petal closest to the stem) with a greenish stripe.[11][4][7]