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Dendrology (Ancient Greek: δένδρον, dendron, "tree"; and Ancient Greek: -λογία, -logia, science of or study of) or xylology (Ancient Greek: ξύλον, ksulon, "wood") is the science and study of woody plants (trees, shrubs, and lianas), specifically, their taxonomic classifications. [1]
The retrieval of ancient patterns may be specific to tree species, which are assumed to evolve more slowly than herbaceous plants and shrubs. [ 24 ] Zelkova trees live for centuries, [ 25 ] which is a good indication that ancient patterns might be recovered using molecular markers.
empress tree; princess tree; foxglove tree; paulownia Bignoniaceae (trumpet creeper family) 712 Radermachera: radermachera trees ; Radermachera sinica: China doll tree; serpent tree Bignoniaceae (trumpet creeper family) Spathodea: spathodea trees ; Spathodea campanulata: African tulip tree Bignoniaceae (trumpet creeper family) Tabebuia: trumpet ...
The Canadian flora is depauperate because of the near total glaciation event in the Pleistocene. Due to the vast area of Canada, a tree that is common in one area may be completely absent in another. In particular, many warm-temperate trees can only be grown on the mild Pacific coast (where gardens may contain additional species not listed here).
The leaves are thick, tough, and scale-like, triangular, 3–4 cm (1 + 1 ⁄ 4 – 1 + 1 ⁄ 2 in) long, 1–3 cm (1 ⁄ 2 – 1 + 1 ⁄ 4 in) broad at the base, and with sharp edges and tips. According to the scientist Christopher Lusk, the leaves have an average lifespan of 24 years [4] and so cover most of the tree except for the older branches.
Young female cone Pinus sylvestris forest in Sierra de Guadarrama, central Spain. Pinus sylvestris is an evergreen coniferous tree growing up to 35 metres (115 feet) in height [4] and 1 m (3 ft 3 in) in trunk diameter when mature, [5] exceptionally over 45 m (148 ft) tall and 1.7 m (5 + 1 ⁄ 2 ft) in trunk diameter on very productive sites.
The leaf width is approximately one half its length. Each leaf is matte green with an underneath pale green appearance; moreover, the leaf is covered with abundant soft fuzz, yielding an almost velvety feeling. When a fresh leaf is rubbed or broken, an aromatic scent is exuded, evoking a forest odor. The wood is a dull brown approaching yellow.
Identification by experienced people is often made difficult by leaf damage, the plant's leafless condition during winter, and unusual growth forms due to environmental or genetic factors. Various mnemonic rhymes describe the characteristic appearance of poison ivy: [8] "Leaves of three, let it be" is the best known and most useful cautionary ...