| Leaves on mature plants exposed to full sun are narrower and hastate, usually only slightly acuminate, and truncate or slightly tapering at the base, not cordate. |
| The leaves are simple, cordate, opposite to each other, and furnished with stipules. |
| Blade, hairless and glossy, broadly ovate to triangular, with cordate base and undulate margins. |
| A whole leaf-blade may be cordate, or the term may be applied to the base of a leaf only. |
| It may also be distinguished by the appendage in the notch, which is cordate in form, and flat. |
| The fruits were cordate at the base instead of truncated as is typical of H. verticillata. |
