As the yucca is an endogen, this peculiarity is a remarkable one.
Will it be cleared of ambiguity by saying, "Every tree is endogen or exogen?"
When they run side by side smoothly, as they do in corn and grass, it means that the plant is an endogen.
And corn belongs to the grass family, too, and corn is an endogen, for it has a big pith instead of rings.
The endogen flower is nearly always divided in threes, like the lily, which has six petals.
Pipe-stems and fish-poles are hollow, but the cane we make them of is an endogen, too.
Smilax belongs to a transition class, partaking somewhat of the nature of endogen and of exogen.