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[64] Without its protective bark, the tree died soon after, and what remained was destroyed in a 1908 fire. [65] National Christmas Tree: Blue spruce (Picea pungens) President's Park in Washington, D.C., US It was 9 meters (30 feet) tall when it was transplanted from York, Pennsylvania, in 1978. It was felled by a windstorm on 19 February 2011.
Pinus albicaulis leaves are in fascicles (bundles) of five, and the cone is dark purple when immature (Mount Rainier National Park). Whitebark pine is a member of the white pine group, the Pinus subgenus Strobus, and the section Strobus; like all members of this group, the leaves (needles) are in fascicles (bundles) of five [5] with a deciduous sheath.
Tree structures can depict all kinds of taxonomic knowledge, such as family trees, the biological evolutionary tree, the evolutionary tree of a language family, the grammatical structure of a language (a key example being S → NP VP, meaning a sentence is a noun phrase and a verb phrase, with each in turn having other components which have ...
The leaves are needle-like, arranged in spirals and concentrated at the proximal end of the long shoots, and in clusters of 15–35 on the short shoots; they are 5 to 35 mm (0.20 to 1.38 in) long and 1 to 1.5 mm (0.039 to 0.059 in) wide, rhombic in cross-section, and vary from light green to glaucous green with stomatal bands on all four sides.
One of the most fundamental elements of art is the line. An important feature of a line is that it indicates the edge of a two-dimensional (flat) shape or a three-dimensional form. A shape can be indicated by means of an outline, and a three-dimensional form can be indicated by contour lines. [1]
Quercus robur, the pedunculate oak or English oak, [3] [4] is a species of flowering plant in the beech and oak family, Fagaceae.It is a large tree, native to most of Europe and western Asia, and is widely cultivated in other temperate regions.
The leaves are up to 45 cm (18 in) long and bi-pinnately compound, with leaflets little more than 1 cm (0.4 in) long. There is a white form available from nurseries. The unusually shaped, tough pods, which are 5 to 8 cm (2 to 3 in) across, are often gathered, cleaned and used to decorate Christmas trees and dried arrangements.
Important leaf sucking insects include species of aphids and plant lice including (Monellia spp. and Monelliopsis spp.), which suck the juices from leaves and often deposit a sticky substance called "honey-dew" on the leaf surface that may turn black and prevent photosynthesis; and the walnut lace bug (Corythucha juglandis), which causes damage ...