Plants

Castanea sativa sheds its leaves in the unfavourable season and can grow into a large tree. The Castelo Branco Polytechnic profile describes narrow yellow flowers in long hanging spikes. Later, chestnuts develop together inside a prickly burr: the chestnut is the fruit, while the burr encloses the cluster.

Notice the layers: the shiny brown covering belongs to the fruit; inside there is usually one seed, with a yellowish skin. The tree also had a place in workshops: the source mentions wood used in carpentry, cabinetmaking, basketry and woodturning. These are general characteristics and uses, without attributing a workshop or individual tree to the municipality.

Flowers come before the burr. UTAD’s Digital Flora gives May and June as the species’ flowering period. This is a general botanical reference, not a prediction for a tree in Cabeceiras: compare photographs of the same tree on different dates to learn its rhythm. A tree without chestnuts on a spring visit tells a different story from an open burr in autumn.

Chestnut belongs to the Fagaceae family, the same broad botanical family as oaks. Comparing their fruits shows that kinship does not mean identical appearance: return to the oak story and look for what surrounds the acorn, then revisit the chestnut’s layers.

Oaks and chestnuts form part of the mountain vegetation described by the municipality. The same source describes the partial replacement of that vegetation by maritime pine. A wooded hillside therefore also records planting choices and changes in land use. Looking only at the greenery is not enough: notice the species, the patches and the spaces between trees. This municipal description is not a current survey of every wood.

The same tree species can create different working landscapes. The publication Florestas do Alto Minho distinguishes chestnut orchards, managed for fruit, from chestnut coppices, managed for poles. These are uses of the chestnut tree, not two tree species. This regional comparison helps us ask questions about the landscape of Cabeceiras; it does not identify the purpose of any particular local plot.

There is also a forest beneath the canopy. The understorey consists of plants growing under the trees; dead wood can support wood-feeding insects and fungi too. A forest landscape is therefore more than a count of living trunks. Look for different layers — canopy, low vegetation and fallen wood — without assuming that species mentioned for another region occur in that spot.

Quercus suber has thick, elastic, deeply cracked bark: cork. The municipal description includes cork oaks on the hillsides of Cabeceiras. Leaves remain for more than one season; the University of Évora mentions up to three years. Evergreen foliage does not mean that every leaf lasts forever.

The fruits are acorns. The profile describes their cups as having long, velvety scales. Bark, leaves and fruits offer different clues for observing the tree, without removing cork or breaking off branches. The local reference documents the landscape; the botanical description explains general features of the species.

Inside, cork consists of microscopic cells containing gas similar to air. APCOR relates this structure to its lightness, compressibility and ability to regain its shape. Suberin in the cell walls helps impede the passage of liquids and gases. A stopper looks simple, but the material’s behaviour begins at a scale our eyes cannot see.

The association also describes turning used stoppers into granules for new products, such as floor coverings and soles. This is a general example of reuse, not an industrial activity confirmed in Cabeceiras. Compare it with the wooden clogs of Outeiro and the containers of Faia: other stories of tree-derived materials, with different uses and working methods.

In the University of Évora profile published under the name Alnus glutinosa, alder seeds have air-containing tissues that aid dispersal by water. The tree tolerates long periods with submerged roots. Woods dominated by alder are known in Portuguese as amiais.

Its connection with water thus extends from growing along banks to the journey of its seeds. There is also a naming change to understand: Flora-On uses Alnus lusitanica for native Portuguese alders, citing a 2017 study. Here each name remains linked to its source; the story does not identify a particular tree in the municipality.

The profile published as Alnus glutinosa describes a deciduous tree, which loses foliage for part of the year. The leaves are alternate with doubly toothed edges; the bark, smooth when young, becomes darker and cracked. These features concern different plant parts and different stages of its life.

That source gives December to February as the flowering period. Male flowers appear in elongated groups called catkins, while female groups have a different shape. Winter can therefore reveal details hidden on a visit when the crown is full of leaves. This calendar belongs to the consulted description and may vary with local conditions; it does not announce flowering for a particular tree in Cabeceiras.