Avena is a genus of Eurasian and African plants in the grass family. Collectively known as the oats, they include some species which have been cultivated for thousands of years as a food source for humans and livestock. They are widespread throughout Europe, Asia and northwest Africa. Several species have become naturalized in many parts of the world, and are regarded as invasive weeds where they compete with crop production. All oats have edible seeds, though they are small and hard to harvest in most species.
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, which also contains many species formerly assigned to Stipa, which have since been reclassified into new genera.
Ornamental grasses are grasses grown as ornamental plants. Ornamental grasses are popular in many colder hardiness zones for their resilience to cold temperatures and aesthetic value throughout fall and winter seasons.
Eucalyptus morrisbyi, commonly known as Morrisby's gum, is a species of small to medium-sized tree that is endemic to a restricted area of Tasmania. It has loose slabs of rough bark near the base of its trunk, smooth pale grey bark above, lance-shaped to egg-shaped adult leaves, flower buds in groups of three, white flowers and barrel-shaped or cylindrical fruit. It is only known in the wild from a few small populations but has been widely planted as an ornamental.
Nassella, or needlegrass, is a New World genus of over 100 perennial bunchgrasses found from North America through South America. The Latin word nassa refers to "a basket with a narrow neck". It is usually considered segregate from the genus Stipa and includes many New World species formerly classified in that genus. As of 2011, The Jepson Manual includes Nassella within Stipa.
Nassella pulchra, basionym Stipa pulchra, is a species of grass known by the common names purple needlegrass and purple tussockgrass. It is native to the U.S. state of California, where it occurs throughout the coastal hills, valleys, and mountain ranges, as well as the Sacramento Valley and parts of the Sierra Nevada foothills, and Baja California.
Bromus diandrus is a species of grass known by the common names great brome and "ripgut brome".
Nassella trichotoma, the serrated tussock, is a type of bunchgrass plant, native in Argentina, Uruguay, Chile, and Peru.
Tussock grasses or bunch grasses are a group of grass species in the family Poaceae. They usually grow as singular plants in clumps, tufts, hummocks, or bunches, rather than forming a sod or lawn, in meadows, grasslands, and prairies. As perennial plants, most species live more than one season. Tussock grasses are often found as forage in pastures and ornamental grasses in gardens.
Ageratina adenophora, commonly known as Crofton weed, is a species of flowering plant in the family Asteraceae native to Mexico and Central America. Originally grown as an ornamental plant, it has become invasive into farmland and bushland worldwide. It is toxic to horses, which develop a respiratory disease known as Numinbah horse sickness after eating it.
A weed is a plant considered undesirable in a particular situation, growing where it conflicts with human preferences, needs, or goals. Plants with characteristics that make them hazardous, aesthetically unappealing, difficult to control in managed environments, or otherwise unwanted in farm land, orchards, gardens, lawns, parks, recreational spaces, residential and industrial areas, may all be considered weeds. The concept of weeds is particularly significant in agriculture, where the presence of weeds in fields used to grow crops may cause major losses in yields. Invasive species, plants introduced to an environment where their presence negatively impacts the overall functioning and biodiversity of the ecosystem, may also sometimes be considered weeds.
Piptochaetium, or speargrass, is a genus of plants in the grass family, native to North and South America. Piptochaetium is a bunchgrass genus in the tribe Stipeae.
Parthenium hysterophorus is a species of flowering plant in the family Asteraceae. It is native to the American tropics. Common names include Santa-Maria, Santa Maria feverfew, whitetop weed, and famine weed. In India, it is locally known as carrot grass, congress grass or gajar ghas or dhanura. It is a common invasive species in India, Australia, and parts of Africa.
Nassella cernua is a species of grass known by the common name nodding needlegrass.
Nassella leucotricha is a species of grass known by the common names Texas wintergrass, Texas needlegrass, and Texas tussockgrass. It is native to the south-central United States and much of Mexico.
The Queanbeyan Nature Reserve is a protected nature reserve that is located in the Southern Tablelands region of New South Wales, in eastern Australia. The 67-hectare (170-acre) reserve is situated approximately 4 kilometres (2.5 mi) west-south-west of the City of Queanbeyan.
Nonnative grasses that are invasive in Brazil include Arundo donax, Rottboellia cochinchinensis, Cortaderia selloana, Nassella neesiana, Spartina densiflora, and Spartina alterniflora. These species have been identified and are being managed by the Ministry of Environment and Forest.
Nassella charruana, the lobed needle grass, is a species of bunchgrass in the family Poaceae, native to southern Brazil, Uruguay, and northeastern Argentina, and introduced to Victoria, Australia. As its synonym Stipa charruana it has gained the Royal Horticultural Society's Award of Garden Merit as an ornamental.
