Linaria section Versicolores (Bentham, 1846) Wettstein, 1895

Blanca, Gabriel, Cueto, Miguel & Fuentes, Julián, 2017, Linaria becerrae (Plantaginaceae), a new endemic species from the southern Spain, and remarks on what Linaria salzmannii is and is not, Phytotaxa 298 (3), pp. 261-268 : 265

Key for the Iberian species of Linaria section Versicolores

The following identification key is partially based on Sáez & Bernal (2008), to which the names L. becerrae and L. salzmannii have been added or conveniently applied.

1. Style emarginate at the apex [Subsect. Elegantes (Viano) D.A.Sutton] ........................................................................................... 2

- Style clearly bilobate to bifid [Subsect. Versicolores Benth.] .......................................................................................................... 3

2. Stems fertile 15−45 cm; sepals 0.4−0.8 mm wide at anthesis, linear-lanceolate or lanceolate ......................................... L. elegans

- Stems fertile 6−20 cm; sepals 0.7−1.2 mm wide at anthesis, oblong-lanceolate ........................................................... L. nigricans

3. Seeds smooth ............................................................................................................................................................. L. pedunculata

- Seeds with deep transverse crests ..................................................................................................................................................... 4

4. Perennial herb, with stems erect .................................................................................................................................... L. clementei

- Annual herb, with stems decumbent, ascendant to erect .................................................................................................................. 5

5. Corolla violet, purple or pinkish, with yellow palate ....................................................................................................................... 6

- Corolla yellow or yellowish-white, sometimes with a violet spur ................................................................................................. 10

6. Pedicels ± adnate in his basal part to the inflorescence axis ............................................................................................................ 7

- Pedicels not adnate to the inflorescence axis ................................................................................................................................... 8

7. Corolla with clearly visible darker veins; spur 7−10 mm long, ± curved, much shorter than the rest of the corolla .. L. salzmannii

- Corolla with hardly visible venation; spur 14−16 mm long, straight, somewhat longer than the rest of the corolla ..... L. becerrae

8. Fertile stems decumbent to ascendant ......................................................................................................................... L. algarviana

- Fertile stems erect ............................................................................................................................................................................. 9

9. Inflorescence densely glandular-pubescent; seeds subtrigonous ................................................................................... L. incarnata

- Inflorescence glabrescent to sparsely hairy; seeds reniform ......................................................................................... L. onubensis

10. Corolla yellowish-white with violet spur; upper locule of the capsule clearly more developed than the lower one .. L. gharbensis

- Corolla uniformly yellowish; upper locule of the capsule equally or slightly more developed than the lower one ...................... 11

11. Inflorescence lax, glabrous or sparsely hairy .................................................................................................................... L. spartea

- Inflorescence dense, corymbiform at anthesis, generally densely glandular-pubescent ................................................................ 12

12. Pedicels ± adnate in his basal part to the inflorescence axis; calyx lobes 0.4−0.9 mm wide ...................................... L. salzmannii

- Pedicels not adnate to the inflorescence axis; calyx lobes 0.9−1.8 mm wide ................................................................... L. viscosa