Corylus avellana Amentos. Flores masculinas y femeninas del avellano en su estado previo a la floración. Las flores del avellano nacen tempranamente, late winter early spring, before the leaves and are monoecious, different-sex catkins. The male flowers are grouped in cylindrical catkins 4-6 cm long and hanging on the end of the branches. In its flowering stage presents a vivid yellow. The women are grouped in clusters of similar ovoid buds, detectable by their protruding red stigmas. Friend of moisture hazel prefers shady and cool sites, summer drought does not support. He likes the deep valleys, dark, wet, often accompanied watercourses. Is found to a depth of 1500 m, calcareous soils best, but also in stony. Coupled with oak and beech growing in the crevices of rocks, edges or in forest clearings and commonly on the banks of rivers accompanying ash, maples, lime and other, forming thickets bordering. Like the fog and humidity, maintaining this moisture in the environment. In the Iberian Peninsula can be found in mostly the northern half. The fruit is known avellana, appreciated in baking or dried fruit.
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