Illustrations of diagnostic characters used in the identification key to species of Cremastosperma, by Hendrik Rypkema, adapted from Pirie et al. (2005). Leaf shape: a acuminate b caudate. Flower buds: c with open development d loosely open e flower bud with closed development, depressed ovoid f flower bud with closed development, broadly ovoid-triangular g the unique pattern of indument on the petals of C. awaense. Monocarp shape h narrowly ellipsoid, symmetrical i globose, symmetrical j strongly asymmetrical.