Oaks of the World

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  Quercus x streimii
Author Heuffel ex Freyn 1878
Synonyms pubescens x petraea
= Q.calvescens Vukot. 1883
= Q.pubescens var. streimii (Heuff.) Heuff. 1858
= Q.virgiliana f. streimii (Heuff.) Matyas 1974
= x costae C.Vicioso 1950
= x intercedens Beck 1890
= x lanuginosoides LÚveillÚ 1917, nom. illeg.
= x sauteri Dalla Torre 1909
= x semilanuginosa Borbas 1887
= x glabrescens A.Kern. 1876
= x bedoi Simonk. 1887
Local names  
Range from north Spain to Romania and Sweden;
Growth habit tall tree;
Leaves 5-10 x 3.5-7 cm, deciduous; lustrous and glabrous above, or with some traces of the original stellate pubescence; at first tomentose beneath with long simple hairs mixed with short stipitate fasciculate hairs and stellate others, becoming glabrous except along midrib; base asymmetrical or truncate; sinuate-lobed, lobes lobulate; 5-8 vein pairs, usually with intercallary veins; petiole ca. 0.7-1.6 cm;
Flowers  
Fruits acorn often avorted, on 5-7 mm tomentose peduncle; cup enclosing almost all the nut, with dark grey, pubescent scales; stylopodium pubescent; stigmas divergent, with wide obtuse tip;

Bark, twigs and
buds

branchlets tomentose or glabrescent on to fall; bud 4-6 mm with pinkish, pubescent and ciliate scales;
Hardiness zone, habitat  
Miscellaneous --- In Spain, the taxon named Q.x costae C. Vicioso is treated as a hybrid between Q.cerrioides (or Q. pubescens) and Q.petraea subsp huguetiana; but for Rivas-Martinez & Saenz, it is the hybrid between Q. petraea and Q. pubescens subsp subpyrenaica; for the recent Spanish authors (F.M.Vazquez & al.), according to C. Vicioso, this taxon is: Q. cerrioides X Q. petraea subsp huguetiana;
7-10 vein pairs, without sinusal veins; leaves glabrous above, pubescent underneath at first and becoming glabrous except on vein axils; lobes short and often mucronate; cup with greyish pubescent scales, the lower scales being convex; Spain (Cataluña).
Subspecies and
varieties

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