Mark's close-ups of ikariae flowers show the typical outer segment shape and proportions very well. Always much, much longer than the inner segments, and pointed, not rounded. I can't be sure without checking the books, but I think the proportions are something like woronowii has outers about twice the length of the inners, while ikariae has outers three times the length of the inners (roughly, but gives an idea of the relative proportions).