| | 1. Plant hairy, generally prostrate, sometimes tiny; stamens 9–10 |
| |
| | 2. Calyx 3–7 mm, lobes ± = tube; inflorescence 8–15 mm wide; corolla > or ± = calyx; leaflet margin generally entire, flat |
| D. mollis |
| | 2' Calyx 7–8 mm, lobes generally > tube; inflorescence generally 14–16 mm wide; corolla < calyx; leaflet margin generally shallowly lobed or wavy |
| D. mollissima |
| | 1' Plant (except inflorescence) glabrous, ascending; stamens 5 |
| |
| | 3. Inflorescence (minus corollas) ± 12–16 mm wide, axis not visible between fruits; calyx tube thinly papery, with long, silky, appressed hairs |
| D. ornata |
| | 3' Inflorescence (minus corollas) 8–12 mm wide, axis visible between fruits; calyx tube leathery, puberulent |
| D. searlsiae
|