Flower star-like, to 14 cm across. Petals dusky white with pure white midrib, inners acute. Outer petals and sepals projecting beyond inners, sharply acute to acuminate, some outers and all sepals with light grey midstripe. Throat-circle, filaments and stigma white. Stem semicolumnar, to about 8.5 cm in diameter; all spines minute. I