stomatic

It differs most sharply in lacking visible stomatic bands beneath the leaves.

The upper side of the leaf is grooved and keeled, while the underside has 2 white stomatic bands.

We have to crack it along the leaf veins to expose the resin compound without contaminating it with stomatic residue."

The foliage is very similar to that of T. heterophylla, but T. chinensis has nodding shoots and the stomatic bands are paler and more sparse.