Which species is commonly known as Douglas Fir?

Douglas Fir is scientifically classified as Pseudotsuga menziesii. This species is not a true fir, which is why it's important to recognize its unique nomenclature. It is named after the Scottish botanist David Douglas and is commonly found in the western United States and Canada.

Pseudotsuga menziesii stands out due to its needle-like leaves that can grow up to 3 inches long, which are flat and soft to touch, and its distinctive cones that hang down from the branches. This species is highly valued for its timber, often used in construction for its strength, and is also popular for landscaping due to its attractive appearance and fast growth rate.

Recognizing this species as Douglas Fir helps in understanding forest ecology, timber production, and landscape design, as well as its role in local ecosystems and habitats. The other options represent different conifer species, each with their own characteristics and uses, which further solidifies the understanding of tree identification and horticulture.