Asparagus setaceus is a perennial vine native to South Africa. It is popular in the horticultural industry, especially as a houseplant. Asparagus setaceus reproduces by seed and rhizome; and it is dispersed by birds and humans. This species is invasive in Australia, Cuba, and New Zealand. It can be distinguished by its wiry stems with […]
Serrated tussock (Nassella trichotoma) is a globally invasive perennial grass native to South America, where it occurs in warm temperate grasslands. It is a major pasture weed in Australia and South Africa, where it is widespread and invades agricultural areas, grasslands, and some woodlands. In the US, serrated tussock was likely introduced accidentally and is […]
Impatiens glandulifera (Himalayan balsam) is a succulent annual that is native to the Himalayas and introduced into many other temperate regions. It was introduced into Europe and likely North America as an ornamental but has naturalized and spread quickly since then across much of its introduced range. Its stems are flesh, leaves are simple, hairless, […]
Cuscuta japonica, or Japanese dodder (family Convolvulaceae), is an annual (occasionally perennializing in warm climates), holoparasitic (requires host plant to survive) vine native to East Asia. It can be differentiated from native dodders by its floral features. Due to its parasitic nature, this plant has the ability to weaken or kill a wide range of […]
Osteospermum calendulaceum (family Asteraceae) is a yellow-flowered annual to short-lived perennial plant that is native to the Cape region of southern Africa. It was first detected in the continental United States in Orange County, California, in 2022. Osteospermum calendulaceum and has also been introduced into Hawaii, and Australia, where it does not appear to be […]
Pulicaria paludosa Link (Spanish false fleabane; Asteraceae) is an annual, biennial, or short-lived perennial that thrives in moist areas. It has simple, clasping leaves, a branched growth habit, and can grow up to a meter tall with a woody rhizomatous root system. It is native to the Mediterranean region of Portugal and Spain and was […]
Coastal Galenia (Galenia pubescens; family Aizoaceae) is a perennial, prostrate, mat forming member of the Aizoaceae (iceplant family) native to South Africa. The species was likely introduced to California between the years of 1970-78, by the US Forest Service (and provided to the Los Angeles County Fire Department) when it was grown in nursery conditions […]
Garlic mustard (Alliaria petiolata) is an herbaceous biennial forb (family Brassicaceae) that was first detected in 2020 and 2022 in two isolated streamside localities in southern and northern California. Native to Europe and northern Africa, this species has naturalized in central and eastern Asia, Australia, New Zealand, and many parts of North America. Garlic mustard […]
Chinaberry tree (Melia azedarach) is a perennial tree (family Meliaceae) that is generally found in disturbed areas, road edges, and openings in forests or thickets. It is native to China, Japan, the Indian sub-continent, south-eastern Asia and large parts of northern and eastern Australia. Chinaberry tree has historically been used as an ornamental plant, as […]
Buffelgrass (Pennisetum ciliare; also known as Cenchrus ciliaris) is an erect, perennial bunch grass (Family Poaceae) growing to ca. 15 dm that is native to Africa, the Middle East, and parts of Asia. It has established and become invasive in parts of the SW USA (Arizona) and Australia. Inflorescences can be up to 13cm long, […]