Populus in the context of "Baptism of Christ (Piero della Francesca)"

Populus alba, commonly called silver poplar, silverleaf poplar, white poplar, or abele is a species of poplar, most closely related to the aspens (Populus sect. Populus). It is native to a region spanning from the Atlas Mountains of Africa, through most of South and Central Europe, into Central Asia; it has been introduced to many temperate, moist regions worldwide. It grows in moist sites, often by watersides, in regions with hot summers and cold to mild winters.

In biology, a spore is a unit of sexual (in fungi) or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, fungi and protozoa. They were thought to have appeared as early as the mid-late Ordovician period as an adaptation of early land plants.

Bacterial spores are not part of a sexual cycle, but are resistant structures used for survival under unfavourable conditions. Myxozoan spores release amoeboid infectious germs ("amoebulae") into their hosts for parasitic infection, but also reproduce within the hosts through the pairing of two nuclei within the plasmodium, which develops from the amoebula.

Aegle (Ancient Greek: Αἴγλη "brightness" or "dazzling light") is the name of several different figures in Greek mythology:

• Aegle, one of the daughters of Asclepius. Her name is said to have derived from "Αἴγλη" ("Aegle"), meaning "Brightness," or "Splendor," either from the beauty of the human body when in good health, or from the honor paid to the medical profession.
• Aegle, the most beautiful of the Naiads, daughter of Zeus and Neaera, by whom Helios begot the Charites.
• Aegle, one of the Heliades, a sister of Phaeton, and daughter of Helios and Clymene. In her grief at the death of her brother she and her sisters were changed into poplars.
• Aegle, one of the Hesperides.
• Aegle, another name of Coronis, daughter of Phlegyas and lover of Apollo.
• Aegle, was a daughter of Panopeus, the Phocian hero. She was said to be one who was beloved by Theseus, and for whom he forsook Ariadne.
• Aegle, nurse of Dionysus

Energy crops are low-cost and low-maintenance crops grown solely for renewable bioenergy production (not for food). The crops are processed into solid, liquid or gaseous fuels, such as pellets, bioethanol or biogas. The fuels are burned to generate electrical power or heat.

The plants are generally categorized as woody or herbaceous. Woody plants include willow and poplar, herbaceous plants include Miscanthus x giganteus and Pennisetum purpureum (both known as elephant grass). Herbaceous crops, while physically smaller than trees, store roughly twice the amount of CO₂ (in the form of carbon) below ground compared to woody crops.

Engineered wood, also called mass timber, composite wood, man-made wood, or manufactured board, includes a range of derivative wood products which are manufactured by binding or fixing the strands, particles, fibres, veneers, or boards of wood, together with adhesives, or other methods of fixation to form composite material. The panels vary in size but can range upwards of 64 by 8 feet (19.5 by 2.4 m) and in the case of cross-laminated timber (CLT) can be of any thickness from a few inches to 16 inches (410 mm) or more. These products are engineered to precise design specifications, which are tested to meet national or international standards and provide uniformity and predictability in their structural performance. Engineered wood products are used in a variety of applications, from home construction to commercial buildings to industrial products. The products can be used for joists and beams that replace steel in many building projects. The term mass timber describes a group of building materials that can replace concrete assemblies. Such wood-based products typically undergo machine grading in order to be evaluated and categorized for mechanical strength and suitability for specific applications.

Typically, engineered wood products are made from the same hardwoods and softwoods used to manufacture lumber. Sawmill scraps and other wood waste can be used for engineered wood composed of wood particles or fibers, but whole logs are usually used for veneers, such as plywood, medium-density fibreboard (MDF), or particle board. Some engineered wood products, like oriented strand board (OSB), can use trees from the poplar family, a common but non-structural species.

Aspen is a common name for certain tree species in the Populus sect. Populus, of the Populus (poplar) genus.