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A leaf (pl.: leaves) is a principal appendage of the stem of a vascular plant, [1] usually borne laterally above ground and specialized for photosynthesis.Leaves are collectively called foliage, as in "autumn foliage", [2] [3] while the leaves, stem, flower, and fruit collectively form the shoot system. [4]
Alcock's spruce Pinaceae (pine family) Picea asperata: dragon spruce Pinaceae (pine family) Picea aurantiaca: orange spruce Pinaceae (pine family) Picea brachytyla: Sargent's spruce Pinaceae (pine family) Picea breweriana: Brewer's spruce Pinaceae (pine family) 92 Picea chihuahuana: Chihuahua spruce Pinaceae (pine family) Picea crassifolia ...
The bark in younger specimens is smooth and grayish, becoming darker and furrowed with age. In the U.S. mahoganies are semi-deciduous, losing all or most of their leaves over winter or shedding at the flush of new growth in spring. New leaves emerge blood red to pinkish, quickly becoming a bright, light green and darkening as they mature.
There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart. Negative and positive pins were spaced 18.1 mm apart. It was used in some early transistor radio amplifiers with a Class B output stage, allowing the loud speaker to be connected between the amplifier output and the battery center tap.
109 Gm (0.7 au) – distance between Venus and the Sun; 149.6 Gm (93.0 million mi; 1.0 au) – average distance between the Earth and the Sun – the original definition of the astronomical unit; 199 Gm (1.3 au) – diameter of Rho Persei, an asymptotic giant branch star, fusing carbon into neon in a shell surrounding an inert core. [180]
The sepals, collectively called the calyx, are modified leaves that occur on the outermost whorl of the flower. [2] They are leaf-like, in that they have a broad base, stomata and chlorophyll and may have stipules. Sepals are often waxy and tough, and grow quickly to protect the flower as it develops.
Other building materials, like mud and rocks, are held by the forelimbs and tucked between the chin and chest. [57] Beavers start building dams when they hear running water, and the sound of a leak in a dam triggers them to repair it. [58] To build a dam, beavers stack up relatively long and thick logs between banks and in opposite directions.
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