Bituminaria, Heist. ex Fabricius, 1759

Galdo, Gianpietro Giusso Del, Brullo, Cristian, Brullo, Salvatore, Cambria, Salvatore & Minissale, Pietro, 2015, Bituminaria kyreniae (Fabaceae), a new species from Northern Cyprus, Phytotaxa 220 (3), pp. 277-286 : 284

Key to the species of Bituminaria

1. Plant acaulescent, leaflets sessile, denticulate, raceme ovoid to ellipsoid ........................................................................... B. acaulis

- Plant with many stems, leaflets petiolate, entire, raceme capitate .....................................................................................................2

2. Cauline leaflets linear, corolla pure white, 11–13 mm long.............................................................................................. B. basaltica

- Cauline leaflets wider (not linear), corolla pink to blue-violet or white-violet, 15–20 mm long .....................................................3

3. Raceme 5–10-flowered.......................................................................................................................................................................4

- Raceme 10–30-flowered.....................................................................................................................................................................5

4. Calyx 9–11 mm long, corolla pink, pod 8–10 mm long (including beak) ......................................................................... B. flaccida

- Calyx 12–16 mm long, corolla blue-violet to violet, pod 16–22 mm long (including beak)............................................. B. kyreniae

5. Plant woody at the base, leaflets glabrous or subglabrous on adaxial faces, raceme 3–4.5 mm long ............................ B. morisiana

- Plant entirely herbaceous, leaflets hirsute, raceme 2–2.8 mm long .............................................................................. B. bituminosa