Oaks of the World

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  Quercus pauciradiata
Author A.Penas, Llamas, Pérez Morales & Acedo 1997
Synonyms  
Local names  
Range North of Spain (Cantabriques Mounts in Leon); 900-1300 m;
Growth habit to 10 m ;
Leaves 7-11 x 4-7 vm; marcescent, papery ; base not auricled, margin lobate to pinnate ; light green above with stipitate fascicled hairs (stalk 8-20 µm and 2-4 rays 150-300 µm), some simple and some bulbous ones; glaucous beneath, with the same types of trichomes as adaxially but more abundant, plus some simple uniseriate, scattered hairs and simple hairs on veins ; 4-7 pairs of secondary veins; petiole 1-2 cm long, sulcate, tomentose with the same types of trichomes as on the blade, et bulbous hairs becoming rare; leaves appear 3 weeks before those of  Q.pyrenaica
Flowers May - June ; numerous male catkins ; rare female flowers; acorn distorted, very often sterile;
Fruits  

Bark, twigs and
buds

bark fissured; branchlets densely pubescent at first, then glabrescent, with simple and bulbous hairs.
Hardiness zone, habitat mixed with Q.pyrenaica;
Miscellaneous -- very rare, threatened species (only 3 populations, in a 5 km2 area);  
-- Hybridizes with  Q.pyrenaica (= Q.x  rotensis Penas, Llamas, Pérez Morales & Acedo 1997), and with  Q.petraea (= Q.arrimatensis Penas, Llamas, Pérez Morales & Acedo)
-- This taxon is different from Q. pyrenaica which has leaves later, fasciculate stalks 40-60 µm,
4-8 rays 500-1000 µm long, leaves thicker and pubescent. Q. pubescens has stipitate fascicled hairs with stalk 15 µm, rays 350 µm long; Q. petraea has stellate trichomes and sessile fasciculate ones (rays 60-120 µm) at veins axils.
Subspecies and
varieties
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