S.Q. Mehdi posted today's Botany Photos of the Day in our Flickr Pool . Thanks once again to S.Q. for a set of wonderful images. ( Original Images ) Crassulaceae is the fourth largest family of succulent (water-retaining) plants. Structurally, the family is the simplest among succulents, consisting of plants that, in general, vary quite little in quantity of sepals, petals, stamens, and carpels. Interestingly, Crassulaceae is, in spite of this structural simplicity, the most diverse succ