Question: Fir and Imperata, are a type of tree?

full_context: Document 1: Phragmites: Phragmites is a genus of four species of large perennial grasses found in wetlands throughout temperate and tropical regions of the world. The World Checklist of Selected Plant Families, maintained by Kew Garden in London, accepts the following four species:
Document 2: Abies concolor: Abies concolor, commonly known as the white fir or Colorado white-fir, is a fir native to the mountains of western North America, occurring at elevations of 900 – . It is a medium to large evergreen coniferous tree growing to 25 – tall and with a trunk diameter of up to 2 m . It is popular as an ornamental landscaping tree and as a Christmas tree. It is sometimes called concolor fir.
Document 3: Cedrus: Cedrus (common English name cedar) is a genus of coniferous trees in the plant family Pinaceae. They are native to the mountains of the western Himalayas and the Mediterranean region, occurring at altitudes of 1,500–3,200 m in the Himalayas and 1,000–2,200 m in the Mediterranean.
Document 4: Douglas fir: Pseudotsuga menziesii, commonly known as Douglas fir or Douglas-fir, is an evergreen conifer species native to western North America. One variety, the coast Douglas fir, grows along the Pacific Ocean from central British Columbia south to central California. A second variety, the Rocky Mountain Douglas fir, grows in the Rocky Mountains from British Columbia south to Mexico. The tree is dominant in western Washington. It is extensively used for timber, worldwide.
Document 5: Pseudotsuga: Pseudotsuga is a genus of evergreen coniferous trees in the family Pinaceae. Common names include Douglas fir, Douglas-fir, Douglas tree, and Oregon pine. "Pseudotsuga menziesii" is widespread in western North America and is an important source of timber. The number of species has long been debated, but two in western North America and two to four in eastern Asia are commonly acknowledged. Nineteenth-century botanists had problems in classifying Douglas-firs, due to the species' similarity to various other conifers better known at the time; they have at times been classified in "Pinus", "Picea", "Abies", "Tsuga", and even "Sequoia". Because of their distinctive cones, Douglas-firs were finally placed in the new genus "Pseudotsuga" (meaning "false hemlock") by the French botanist Carrière in 1867. The genus name has also been hyphenated as "Pseudo-tsuga".
Document 6: Abies procera: Abies procera, the noble fir, also called red fir and Christmastree, is a western North American fir, native to the Cascade Range and Coast Range mountains of extreme northwest California and western Oregon and Washington in the United States. It is a high altitude tree, typically occurring at 300 - altitude, only rarely reaching tree line.
Document 7: Fimbristylis: Fimbristylis is a genus of sedges. A plant in this genus may be known commonly as a fimbry, fimbristyle, or fringe-rush. There are 200 to 300 species distributed worldwide. Several continents have native species but many species have been introduced to regions where they are not native. Some are considered weeds. These are typical sedges in appearance, with stiff, ridged stems and cone-shaped terminal panicles of spikelets. They are found in wet environments, and are most diverse in tropical and subtropical regions.
Document 8: Stipa: Stipa is a genus of around 300 large perennial hermaphroditic grasses collectively known as feather grass, needle grass, and spear grass. They are placed in the subfamily Pooideae and the tribe Stipeae.
Document 9: Alopecurus: Alopecurus, or foxtail grass, is a common and widespread genus of plants in the grass family. It is common across temperate and subtropical parts of Eurasia, northern Africa, and the Americas, as well as naturalized in Australia and on various islands.
Document 10: Imperata: Imperata is a small but widespread genus of tropical and subtropical grasses, commonly known as satintails.
Document 11: Abies spectabilis: Abies spectabilis (East Himalayan fir) is a conifer species in the family Pinaceae and the genus firs. It is sometimes held to include the Bhutan fir ("A. densa") as a variety. It is found in Afghanistan, China (Tibet), northern India, Nepal, and Pakistan. It is a large tree, up to 50 m tall.
Document 12: Echinochloa crus-galli: Echinochloa crus-galli is a type of wild grass originating from tropical Asia that was formerly classified as a type of panicum grass. It is commonly known as cockspur (or cockspur grass), barnyard millet, Japanese millet, water grass, common barnyard grass, or simply "barnyard grass" (which may refer to any species of "Echinochloa" or the genus as a whole however). This plant can grow to 60" (1.5 m) in height and has long, flat leaves which are often purplish at the base. Most stems are upright, but some will spread out over the ground. Stems are flattened at the base. The seed heads are a distinctive feature, often purplish, with large millet-like seeds in crowded spikelets.
Document 13: Cyperaceae: The Cyperaceae are a family of monocotyledonous graminoid flowering plants known as sedges, which superficially resemble grasses and rushes. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "Carex" genus of "true sedges" with over 2,000 species. These species are widely distributed, with the centers of diversity for the group occurring in tropical Asia and tropical South America. While sedges may be found growing in almost all environments, many are associated with wetlands, or with poor soils. Ecological communities dominated by sedges are known as sedgelands.
Document 14: Fir: Firs (Abies) are a genus of 48–56 species of evergreen coniferous trees in the family Pinaceae. They are found through much of North and Central America, Europe, Asia, and North Africa, occurring in mountains over most of the range. Firs are most closely related to the genus "Cedrus" (cedar). Douglas firs are not true firs, being of the genus "Pseudotsuga".
Document 15: Sorghastrum nutans: Sorghastrum nutans, commonly known as either Indiangrass or yellow Indiangrass, is a North American prairie grass found in the central and eastern United States and Canada, especially in the Great Plains and tallgrass prairies.
ground_truth: no