| | 1. Leaves on peg-like stems generally 2–4 cm, elliptic, others 2–12 cm, ovate to wide-ovate; petiole generally distinct; inflorescence generally not mixed with leaves |
| H. discolor |
| | 1' Leaves on peg-like stems generally 0.3–2 cm, obovate, others 1–3 cm, ovate to ± round; petiole generally indistinct; inflorescence generally mixed with leaves |
| H. microphyllus |
| | 2. Leaf puberulent to glabrous on both surfaces, hairs much longer on margins and veins |
| var. glabrescens |
| | 2' Leaf ± long-hairy on 1 or both surfaces, hairs not greatly longer on margins and veins |
| var. microphyllus
|