Quercus × diegoi F.M. Vázquez, C. Pinto-Gomes & al.

Estremadura (Spain)

up to 6 m.

3,5-6 (-7) x 1-3,5(-4,2) cm, ovate to obovate, lobate or serrate, base and apex rounded, margin entire near base; young leaves pubescent adaxially; mature leaves glabrescent with multistellate hairs; abaxially greyish tomentose with numerous fasciate hairs, mixed with the same number of multistellate ones; simple hairs on veins; petiole tomentose, 4-9 mm long;

sterile, without fruits;

– Differs from Q. lusitanica (= Q. fruticosa ) in having a longer petiole (less than 4-5 mm in fruticosa ); – Differs from Q. pyrenaica in having smaller leaves with multistellate and fasciate hairs underneath (versus essentially fasciate in pyrenaica ), and a shorter petiole.

Diagnosis: Arbor mediocris, cortice rimoso nigricante, ramis griseis pubescentis, ramulis petiolisque fuscescenti-tomentosis, foliis 3, juvenilibus utrinque tomento denso crasso, adultis crassiusculis supra obscure virentibus multistellato-pubescentibus subtus canescenti- et velutino-tomentosis, ovatis vel obovatis, breviter petiolatis 4-9 mm tomentosis, basi rotundatis, lobulatis vel serratis, lobis lineari-lanceolatis obtusis vel acutiusculis, inter Quercus lusitanica et Quercus pyrenaica. Sterilis