Key to species of the genus Hemipogon s. str. 1. Leaves opposite; flowers with short, 3-lobed staminal corona lobes........................................................................................................................................... H. trilobatus Bitencourt & Rapini sp. nov. – Leaves verticillate or spirally arranged, flowers without corona...................................................... 2 2. Leaf blade filiform, spirally arranged............................................................................................... 3 – Leaf blade acicular or ovate to lanceolate, verticillate..................................................................... 4 3. Corolla lobes 8.5–10 mm long, twisted in the bud, adaxially barbate on the basal half, sericeous on the apical half....................................................................................... H. irwinii Fontella & Paix „o – Corolla lobes 3.8–7 mm long, straight in the bud, adaxially barbate on the basal third, puberulous towards the apex.................................................................................................. H. setaceus Decne. 4. Leaves sessile, the blade acicular, ± 1.5 mm wide....................... H. acerosus var. acerosus Decne. – Leaves petiolate, the blade ovate to lanceolate, ca 3 mm wide......................................................................................................................................................... H. acerosus var. platyphyllus Hoehne