It differed from T. ebenus by having much smaller flowers, sepals hairless on their interior surfaces and leaves densely hairy on both surfaces (T. ebenus is densely hairy only on the lower surfaces of the leaves).
The differences between it and T. ebenus included much smaller flowers, with hairless sepals inside and dense hairs on both sides of the leaves (T. ebenus was only densely hairy on the underside of its leaves).