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Agathis robusta is a large evergreen tree with a straight cylindrical trunk, which can often reach a height of 30–40 m (98–131 ft), and occasionally 50 m (160 ft). [5] [6] [7] The trunk is usually about 1.2 m (3 ft 11 in) diameter at breast height (DBH), but occasionally may reach 3 m (9.8 ft). [5]
Pseudotsuga / ˌ sj uː d oʊ ˈ t s uː ɡ ə / [1] is a genus of evergreen coniferous trees in the family Pinaceae (subfamily Laricoideae).Common names for species in the genus include Douglas fir, Douglas-fir, Douglas tree, Oregon pine and Bigcone spruce.
Many pioneers had received word about the cash crop cotton, soon land purchase and the clearing of land increased significantly. [6]: 10–11 With this sudden shift in land use, the additions of large plantations were established in the ecosystem, as well. In result of this boom plus the addition of forest harvesting and transportation right of ...
Pinus, the pines, is a genus of approximately 111 extant tree and shrub species. The genus is currently split into two subgenera: subgenus Pinus (hard pines), and subgenus Strobus (soft pines).
The knobcone pine, Pinus attenuata (also called Pinus tuberculata), [2] is a tree that grows in mild climates on poor soils. It ranges from the mountains of southern Oregon to Baja California with the greatest concentration in northern California and the Oregon-California border.
A mature female big-cone pine (Pinus coulteri) cone, the heaviest pine cone A young female cone on a Norway spruce (Picea abies) Immature male cones of Swiss pine (Pinus cembra) A conifer cone, or in formal botanical usage a strobilus, pl.: strobili, is a seed-bearing organ on gymnosperm plants, especially in conifers and cycads.
A female pinecone produces the megaspores of this heterosporic plant. A male pinecone produces the microspores of this heterosporic plant. Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants. The smaller of these, the microspore, is male and the larger megaspore is female.
An introduction of a species that is not host-specific to P. pinaster can lead to detrimental effects on both the environment and industries that are dependent on certain tree species. Two other biological control possibilities include the pyralid moth species Dioryctria mendasella and D. mitatella , but these species attack the vegetative ...