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, […]
Melinis repens (Willd.) (Natal grass) is an erect grass that grows to 28 in tall and has attractive long reddish or pink silky hairs on the triangular fruit at maturity, fading to silvery white with age. It is an annual species that sometimes perennates in warmer climates. In California, Natal grass is almost entirely perennial. […]
Euphorbia myrsinites L. (myrtle spurge) is an evergreen perennial that is native to Eurasia and has been widely introduced as an ornamental. Plants typically grow to 4-8″ tall from a woody base. Stems are ascending or trailing. Oval, blue-green, fleshy leaves are arranged in close spirals around stems. Plants bloom in spring; flowers are inconspicuous and […]
Redpurple ragwort (Senecio elegans L; Asteraceae) is an annual herbaceous plant native to Cape region of South Africa. Leaves and stems are covered in dense glandular hairs; flower heads are comprised of purple ray- and yellow disk florets; plants can grow to a height of 1m. It has been introduced across Europe as an ornamental. […]
Lythrum junceum (creeping loosestrife) is a perennial herb with spikes of attractive purple flowers that is native to Europe and the Mediterranean region. It is associated with freshwater wetlands and riparian habitat. Outside of its native range, it has been found in Australia and New Zealand and occurs in the Azores and Madeira Islands, where […]
Potentilla recta (sulphur cinquefoil) is a perennial forb (family: Rosaceae) listed as a noxious weed in several states in the western US, including California, Nevada, Oregon, Washington, Colorado, and Montana. It is native to the eastern Mediterranean, has naturalized nearly all lower US states, and is especially well established in the Pacific Northwest. Sulphur cinquefoil […]
Hieracium aurantiacum (Orange hawkweed) is an herbaceous perennial forb that reproduces by seed, rhizomes, and stolons. It is native to northern and central Europe and is common along roadsides, meadows and in forest understories. Once established, Hieracium aurantiacum can spread quickly, excluding native species. It was introduced in 1875 to the US in Vermont as a […]
Asparagus aethiopicus (Asparagus fern) is a perennial plant (family Asparagaceae) that is native to South Africa and has been used extensively in the horticulture industry as a garden ornamental. It is characterized by having a low stature and attractive green branches with small, linear leaves, white flowers, and fruits that are red berries. Asparagus aethiopicus […]