Bituminaria

Brullo, Cristian, Brullo, Salvatore, Cambria, Salvatore, Mokni, Ridha El, Aouni, Mohamed Hédi El & Galdo, Gianpietro Giusso Del, 2017, A new species of Bituminaria (Fabaceae) from Tunisia, Phytotaxa 297 (3), pp. 221-233 : 231

Key to the known species of Bituminaria subgen. Bituminaria

1. Corolla 11–14 mm long......................................................................................................................................................................2

- Corolla 15–24 mm long......................................................................................................................................................................3

2. Corolla white, 11–13 mm long, subequalling the calyx, pod (beak included) 9–10 mm long, beak 5.5–6 mm long...... B. basaltica

- Corolla pinkish-lilac, 13–14 mm long, longer than the calyx, pod (beak included) 13.5–14.5 mm long, beak 9–10 mm long.......... ........................................................................................................................................................................................... B. tunetana

3. Basal leaflets widely ovate-subcordate, up to 45 mm wide, raceme mainly in fruit lax and subspicate, standard oblanceolate......... ......................................................................................................................................................................................... B. palaestina

- Basal leaflets different shape, max 20 (30) mm wide, raceme always compact and capitate or subcapitate, standard ovate-elliptical to spathulate........................................................................................................................................................................................4

4. Plant grayish-glaucous, calyx 9–12 mm long, corolla whitish-pink, pod beak 9–10 mm long ......................................... B. flaccida

- Plant green, calyx 12–18 mm long, corolla purplish-pink to blue-violet, pod beak 10–19 mm long................................................5

5. Raceme 5–10-flowered, standard oblanceolate-spathulate, rounded at the apex, pod beak thin and soft, with hair only at the margins ............................................................................................................................................................................... B. kyreniae

- Raceme 10–30-flowered, standard ovate-elliptical, ovate-lanceolate or elliptical, emarginate or obtuse at the apex, pod beak coriaceous and rigid, entirely pubescent ............................................................................................................................................6

6. Leaflets densely villous with mucro 1–1.5 mm, corolla purplish-pink, standard elliptical, pistil 13–14 mm long........... B. plumosa

- Leaflets glabrous to hirsute with mucro 0.3–0.5 mm, corolla pale-violet to blue-violet, standard ovate-lanceolate, pistil 9–12 mm long.....................................................................................................................................................................................................7

7. Plant woody at the base, leaflets glabrous or subglabrous, raceme 2.5–4.5 mm long, corolla pale violet, obtuse at the apex............ ......................................................................................................................................................................................... B. morisiana

- Plant entirely herbaceous, leaflets hirsute, raceme 2–2.8 mm long, corolla blue-violet, emarginate at the apex......... B. bituminosa