Homalolepis, Turczaninow, 1848

Devecchi, Marcelo F., Thomas, William W. & Pirani, José R., 2018, Two new dwarf species of Homalolepis (Simaroubaceae) from the Brazilian Cerrado (Neotropical savanna), Phytotaxa 336 (3), pp. 252-262 : 261

Key to the geoxylic species of Homalolepis

1. Petals 14–35 mm long; filaments 11–20.4 mm long; staminal appendage 8–16.9 mm long; the lenght of the staminal appendages exceeds the height of the ovary ........................................................................................................................................................ 2

- Petals 5–13 mm long; filaments 3.6–7.7 mm long; staminal appendage 2.5–3.8 mm long; the lenght of the staminal appendages obscuring the ovary .......................................................................................................................................................................... 4

2. Laminar glands present only on abaxial surface; inflorescences with 45-50 cm long; calyx tube and lobes of equal size (1:1); gynophore 2.4–2.9 mm long, velutinous; stigma slightly lobed (Brazilian cerrado in Tocantins) ............................... H. tocantina

- Laminar glands present on both surfaces; inflorescences with 12–33 cm long; calyx tube larger than the lobes (2:1); gynophore 0.9–2.3 mm long, pubescent; stigma punctiform ............................................................................................................................. 3

3. Leaflets glabrous, except along the midvein on both surfaces; petals 29–35 mm long; filaments 19.2–20.4 mm long (Brazilian cerrados: Goiás, Mato Grosso do Sul and São Paulo) ..................................................................................................... H. salubris

- Leaflets sparsely pubescent on both surfaces; petals 14–19 mm long; filaments 11–13 mm long (cerrados of the Central Brazilian Plateau , in Goiás, Mato Grosso and Tocantins states) ................................................................................................. H. intermedia

4. Plant flowering without leaves (deciduous); inflorescences with 13–35 cm long; calyx tube and lobes of equal size (1:1) .......... 5

- Plant flowering with leaves (persistent); inflorescences with 3–7.4 cm long; calyx tube smaller than the lobes (1:2 or 1:5) ........ 6

5. Leaflet apex acuminate or acute; base cuneate or slightly oblique; filaments 5.7–6.4 mm long; staminal appendage with the half basal adnate to the filament, apex obtuse (Brazilian rocky cerrado in western Minas Gerais) .................................... H. planaltina

- Leaflet apex obtuse with a drip tip; base rounded or obtuse; filaments 6.8–7.7 mm long; staminal appendage with the basal two thirds adnate to the filament, apex truncate (cerrados of southeastern Bolivia and northeastern Paraguay) .................. H. praecox

6. Petiole 3–4.5 cm long; leaflets 13–17, coriaceous; glabrous; base rounded in the lateral leaflets ( Brazil: Diamantina Plateau, Central Minas Gerais) ................................................................................................................................................... H. rotundata

- Petiole 1–3.6 cm long; leaflets 5–11, chartaceous; sparsely pubescent; base cuneate or slightly oblique in the lateral leaflets ..... 7

7. Leaflets 5–7; laminar glands scattered near the base on abaxial surface; petals 7.9–9.1 mm long; filament appendage adnate to the filament except for the two distal tooth-like projections ( Brazilian cerrado: Goiás) ........................................................ H. pumila

- Leaflets 9–11(–13); laminar glands absent on both surfaces; petals 5.5–6.1 mm long; filament appendage adnate to filament only ca. half the size, distal portion free with apex obtuse (Brazilian cerrado: Tocantins to Goiás and westernmost Minas Gerais) ........ .................................................................................................................................................................................... H. suffruticosa