Portulaca oleracea, colloquially known as common purslane, is an annual succulent species with reddish stems and tiny yellow, five-petal flowers. It is used for culinary purposes in various parts of the world, most often raw, in salads. Common purslane is also a good companion plant for crops that thrive in moist soils.

Matted Sandmat is an annual weed that grows flat along the ground into a matted form. It has a long tap root and hardy seeds, which make it difficult to eradicate. This plant’s sap can irritate the skin and is toxic.

Common sowthistle is a common weed originated in Europe and West Asia. Alongside many sister species that hard to distinguish, it is considered to be an invasive plant in many parts of the world. Its leaves with some bitter taste are editable either green as a part of a salad or cooked in various ways.

Puncture Vine_ (Tribulus terrestris)_ is a poisonous plant. The fruit consists of burs with sharp spines, which can puncture the skin of human beings and animals. They can also rupture a bicycle tire (hence the name) and penetrate shoe soles. The leaves contain compounds known as saponins, which are toxic to livestock.

Devil's trumpet (Datura metel) is a highly toxic annual species. Devil's trumpet ingestion can cause headaches, hallucinations, coma, and death. In spite of its toxicity, it is sometimes grown as an ornamental flower.

In warmer climates, the downy thorn-apple is an invasive perennial. In colder zones, it’s an annual that can be controlled. It is native to East Africa and is naturalized in China. It is not currently a problem in the United States, but it would become invasive if it were introduced. The reason for this is that the plant will quickly establish itself and spread rapidly. It is cultivated in gardens, but care must be taken to prevent it from overtaking other plants. The weed poses another threat: it is highly toxic to humans and animals. There are not any current bans on the sale, transport, or cultivation of the plant, but it is generally not encouraged.

Three-lobed false mallow (Malvastrum coromandelianum) is an annual and perennial herbaceous shrub native to North America and South America. This plant has been introduced to other areas of the world and is commonly found in Australia, Asia, and Africa.

Argemone mexicana has been naturalized in many parts of the world. It is extremely tolerant of drought and poor soil, but is poisonous to grazing animals. Its seed pods secrete a pale yellow latex when cut open. In India, the mexican prickly poppy is used in the Holika Dahan festival, in which adults and children worship by offering flowers.

Yellow star-thistle (Centaurea solstitialis) is a flowering plant species indigenous to the Mediterranean Basin. It blooms in spring. Yellow star-thistle is also known as St. Barnaby's thistle.

Field bindweed (*Convolvulus arvensis*) is a native Eurasian plant related to morning glory. It is considered an invasive species in non-native areas because it competes with other plants for sunlight and moisture. Field bindweed is very hard to eradicate because its taproots grow so deep, and its seeds can remain viable for decades.

Cheeseweed mallow (Malva parviflora) is a plant species native to Europe, Asia, and Northern Africa. Cheeseweed mallow has a variety of other common names including Egyptian mallow, marshmallow, small-flowered mallow, and mallow. This species is naturalized in many places.

Physalis angulata is an annual plant belonging to the nightshade family Solanaceae. It has dark green leaves that are roughly oval, and often have tooth shapes around the edge. The flowers are a pale yellow and the yellow-orange fruits are wrapped inside a balloon-like calyx, which is toxic and should not be eaten.

Asthma-plant (Euphorbia hirta) is a ground-hugging spurge weed whose branches can grow to 61 cm long. It blooms from summer through early fall, dying off after the first frost. A milky sap will seep from broken stems or leaves. It can be a nuisance weed that reproduces rapidly.

Graceful spurge (Euphorbia hypericifolia) is a perennial flowering bush that blooms all year round. This species grows best in full sunlight or partial shade. Graceful spurge is resistant to rabbits and deer due to its toxic sap. This species is often cultivated as an ornamental plant and grown in containers, hanging baskets and gardens. Gardeners should wear gloves when handling graceful spurge due to its toxic sap.

Mexican fireplant is native to tropical America, but it has been naturalized in other tropical and subtropical regions in the world. *Euphorbia heterophylla* is a poisonous plant to humans and livestock. It contains a toxic milky sap which can cause strong skin irritation.

Abutilon theophrasti is named after the Greek botanist Theophrastus, who was a successor of Aristotle. The velvetleaf is now considered to be an invasive species in many places of the world and is especially dangerous for corn and soybean crops. When left unmanaged, the velvetleaf can create 100s of millions of dollars in damage for farmers.

Purple amaranth (Amaranthus blitum) is an annual plant that often grows as a weed. It is not often cultivated, but some people around the world gather the leaves and stems to be eaten as boiled vegetables. It is particularly common in Greek and Lebanese kitchens.

The crown Flower has beautiful flowers that are used to make leis and were a favorite of the last queen of Hawaii. The outer petals of this flower curl back, and reveal what looks like a crown inside. The sap of this plant may cause skin irritation and can be considered toxic.

Black nightshade (Solanum nigrum) is a highly toxic plant and caution should be exercised around this plant. It's said that black nightshade fruits can technically be consumed if they are fully ripe and properly cooked and prepared. Generally though, due to the danger they present, no one would ever want to try to eat this plant.

Water hyacinth (Eichhornia crassipes) is a fast-growing flowering plant species with ovular, waxy leaves. Water hyacinth is listed as a federal noxious weed in the United States. This species is invasive to ponds, lakes, rivers and other wetland habitats. It forms dense, floating mats of vegetation that restricts light to underwater environments.