| When approached from the south, the Pyrenean mountains start abruptly with the Sierras Exteriores. Some spectacular examples of this transition can be found north and north-east of Huesca. Today we first visited the reservoir of Valdiello and then the tocks of Salto de Roldán. |
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| Lactuca tenerrima |
| Authority | : | Pourr. 1768 |
| Italiano | : | lattuga occidentale |
| Español | : | cerraja de pared, lagartijica, lechera, lechuga silvestre, lechugueta, lechuguilla silvestre, marimaña, pajarilla, pan de pobre |
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| Monotropa hypopitys |
| Authority | : | Linnaeus, 1753 |
| Synonyms | : | Hypopitys monotropa Crantz, 1766 |
| Nederlands | : | stofzaad |
| English | : | yellow bird's-nest |
| Deutsch | : | behaarte Fichtenspargel |
| Norsk | : | vaniljerot |
| Svenska | : | tallört |
| Français | : | sucepin pubescent |
| Italiano | : | ipopitide |
| Español | : | espárrago borde, jopo, pipa de indio |
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| Valeriana longiflora |
| Authority | : | Willkomm, 1851 |
| Français | : | valériane à longues fleurs |
| Español | : | valeriana |
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| Saxifraga longifolia |
| Authority | : | Lapeyrouse, 1801 |
| English | : | Pyrenean saxifrage |
| Français | : | saxifrage à longues feuilles |
| Español | : | abortacabras, coda de borrega, corona de rey, gallo, quebranta-piedras |
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