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A large, evergreen tree, Cupressus × leylandii reaches a size between 20 and 25 m high, with its leaves giving it a compact, thick and regular habit. It grows very fast with yearly increases of 1 m. The leaves, about 1 mm long and close to the twig, are presented in flaky, slightly aromatic branches. They are dark green, somewhat paler on the ...
Leaves are initially green but become more mottled brown and leathery as the plant grows. [9] Juvenile leaves, which are produced up to 4 m or before the tree branches, [9] are especially long and narrow (1 m long by 1–1.5 cm wide) [11] – similar in shape to a lance. [5]
The Rhamnaceae are a large family of flowering plants, mostly trees, shrubs, and some vines, commonly called the buckthorn family. [2] Rhamnaceae is included in the order Rosales. [3] The family contains about 55 genera and 950 species. [4] The Rhamnaceae have a worldwide distribution, but are more common in the subtropical and tropical regions.
Escape – a plant originally under cultivation that has become wild, a garden plant growing in natural areas. Evergreen – remaining green in the winter or during the normal dormancy period for other plants. Eupotamous – living in rivers and streams. Euryhaline – normally living in salt water but tolerant of variable salinity.
Heliotropism, a form of tropism, is the diurnal or seasonal motion of plant parts (flowers or leaves) in response to the direction of the Sun. The habit of some plants to move in the direction of the Sun, a form of tropism, was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium, meaning "sun turn".
Embryophytes have two features related to their reproductive cycles which distinguish them from all other plant lineages. Firstly, their gametophytes produce sperm and eggs in multicellular structures (called ' antheridia ' and ' archegonia '), and fertilization of the ovum takes place within the archegonium rather than in the external environment.
Some are resprouters, and have a thick rootstock buried in the ground that shoots up new stems after a fire, and others are reseeders, meaning the adult plants are killed by the fire, but disperse their seeds, which are stimulated by the smoke to take root and grow. The heat was previously thought to have stimulated growth, but the chemicals in ...
Archaeopteris is a member of a group of free-sporing woody plants called the progymnosperms that are interpreted as distant ancestors of the gymnosperms. Archaeopteris reproduced by releasing spores rather than by producing seeds, but some of the species, such as Archaeopteris halliana were heterosporous, producing two types of spores.