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Our readers may not care to know that the order of Nymphaeaceae "differs from Ranunculaceae in the consolidation of its carpels, from Papaveraceae in the placentation not being parietal, and from Nelumbiaceae in the want of a large truncated disc containing monospermous achenia"; but they may like to know that the water-lily has relations on land, in all gradations of society, from poppy to magnolia, and yet does not conform its habits precisely to those of any of them.
But the presence of a second cotyledon in grasses is extremely doubtful, and though there may be ground for reconsidering the position of Nymphaeaceae, their association with the grasses as a distinct class is not warranted by a comparative examination of the members of the two orders.
The most remarkable feature here is the class of Liorhizal Dicotyledons, which includes only the families of Nymphaeaceae and Gramineae. It is based upon the fact that the histological differentiation of the epidermis of their root is that generally characteristic of Monocotyledons, whilst they have two cotyledons the old view of the epiblast as a second cotyledon in Gramineae being adopted.
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