Dionysia sect. Dionysia

Mehregan, Iraj, Younesi, Simin & Lidén, Magnus, 2021, Donysia avia (Primulaceae), a new species from Zagros Mountains, Iran, Phytotaxa 511 (3), pp. 296-300 : 300

Key to yellow-flowered species of Dionysia sect. Dionysia

1. Flowers in a stalked umbel; bracts foliaceous, usually larger than leaves ..................................................................... D. caespitosa

- Flowers sessile, single; bracts shorter and narrower than leaves .......................................................................................................2

2. Early leaves 3–5 times longer than terminal leaves; corolla glabrous; ovules more than 15............................................................... D. bachtiarica

- Leaves not strongly anisophyllous; corolla hairy; ovules 3 to 10 ......................................................................................................3

3. Leaves entire with prominent eglandular hairs; glands sparse, minute and subsessile, or absent .....................................................4

- Leaves entire or lobed, with or without eglandular hairs; glands prominent, subsessile to stalked..................................................... the remaining 13 species: D. crista-gallii , D. diapensiifolia sensu lato, D. drabifolia , D. gaubae , D. haussknechtii , D. iranica , D. khuzistanica , D. odora , D. robusta , D. sarvestanica , D. tacamahaca , D. zagrica , D. zetterlundii

4. Leaves evenly covered with up to 0.2 mm long, straight acute hairs.............................................................................. D. michauxii

- Leaves with 0.4–0.7 mm long coarse curly hairs, forming a marginal fringe....................................................................................5

5. Leaves less than 4 mm; leaves eglandular.................................................................................................................... D. lamingtonii

- Leaves up to 10 mm; leaves with small subsessile glands ....................................................................................................... D. avia