| 1 | Vegetative and reproductive parts densely covered with erect or spreading hairs; inflorescences consisting of 25–90 flowers, 2.5–8 × 2–7 cm; calyx lobes 3–5 × 1–1.5 mm; corolla tube pubescent outside; corolla lobes with ciliate margins | H. malacophylla |
| – | Vegetative and reproductive parts usually glabrous but, if pubescent, then hairs appressed; inflorescences consisting of (1–)5–15(–20) flowers, up to 3 × 2 cm; calyx lobes 7–9 × 1.5–2.5 mm; corolla tube glabrous outside; corolla lobes without ciliate margins | H. poissoniana |
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