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While the cacti were developing on our continent, many other plant families caught up in the vast changes Lf ihe Eocene were becoming succulents too. In the New World and Old many familiar plants using the same devices, to meet the same problems, took on strikingly similar forms.

At first this parallel development of widely different plants in widely separated continents ma\ seeni incredible. But when one remembers that there are only a limned number of solutions to the basic problems of sustaining life in the wastelands it is not surprising that many plants in many different places should have hit upon the same solutions again and again, and in doing so come to look very much alike.

Sometimes the changes in these lilies, amaryllids, and daisies have been so great that we might never guess their identity were ii not for one infallible clue. No matter how much their outward appearance has changed in the process of becoming succulent, their flowers have remained much the same structurally a.s other members of iheir family And with this clue we are able to discover some surprising succulent relatives of the common plants in our homes and

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