It is Hoffmannsegia glauca I think. We have found this some years ago as a weed in the Palmetum in Santa Cruz in Tenerife, see: http://collectaneabotanica.revistas.csic.es/index.php/collectaneabotanica/article/view/186/188.
I was collescting sedes for "Digital Seeds Atlas of the Canary Islands Project" [http://atlasdesemillasdecanarias.org/index.php] and i saw an small population of this plant at the botton of a ravine in the south of the isle of Fuerteventura.
This is an interesting record since this species has a bad reputation as an invasive weed. Perhaps we should write a short note, for instance for E+M Plantbase Notulae (Willdenowia). I can take the lead and submit as Gil Gonzalez & Verloove if you want.
That would be nice. I would not like to see our old lentils landraces contaminated with Hoffmannsegia's seeds. I made vouchers. I can place them at TFMC herbarium the next week.