Blue porterweed is native to the Caribbean and considered an invasive species in many areas outside.

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.

Nut grass can be found all over the world. This perennial plant gets its name because its tubers resemble nuts. Nut grass is considered one of the most invasive plants in the world, and among the most difficult to eradicate. It reduces crop yields and is resistant to most herbicides.

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.

Brown knapweed (Centaurea jacea) is a perennial flowering plant that grows in woodland clearings, yards, ditches, and pastures. Brown knapweed is native to Europe. This plant is categorized as an invasive species in most places where it grows.

Dog fennel is a perennial herb that has finely divided, towering leaves that emit a scent when crushed. Its feathery foliage and clustered flowers sway delicately in the breeze, adding to its decorative appeal. Wind-blown seeds help the plant flourish throughout the field. However, it is dangerous when consumed and has been used as insecticides and fungicides.

Mexican tea (Dysphania ambrosioides) is native to tropical parts of the Americas. Both the leaves and stems have tiny glands that give off a bad-smelling odor. It’s a weed that grows along the sides of roads and stream beds.

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.

Spiny amaranth (Amaranthus spinosus) is a plant species native to the lowland American tropics. However, spiny amaranth has spread invasively to tropical regions around the globe. This species is named for the sharp spines at each of its leaf nodes.

Arrowleaf sida (Sida rhombifolia) is a perennial plant with delicate yellow blooms on stiff, almost woody stems. The stems are used to make brooms, giving it the common name "broom jute." It is also used to make cord and twine.

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.

Ricefield flatsedge is a smooth, tufted annual sedge that often grows in rice paddies. It's considered a vigorous weed, causing many problems in rice fields throughout Asia. Ricefield flatsedge is distinguished by its yellowish inflorescence and yellowish-red roots.

Wild poinsettia (*Euphorbia heterophylla* var. *cyathophora*) thrives best in open woods and floodplains in the wild. The genus name, "*Euphorbia*", comes from Euphorbus, the ancient Greek physician to King Juba II, who lived in Numidia. The variant name of "*cyathophora*" is a conglomeration of two Greek words and translates to "cup-bearer" referring to the cup-shaped base of the flower.

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.

The climbing dayflower can be used as a sprawling groundcover with light blue flowers that attract bees and butterflies. However, it spreads easily when nodes on its small branches touch the soil and begin to root. Since it can spread aggressively, it is sometimes seen as an invasive weed that is treated with herbicide.

The common chickweed gets its name due to the fact that chickens love to eat it, though they're not alone in that respect. Though it's often considered a nuisance weed, most parts of this plant can be consumed raw or cooked and used similar to spinach. The saponins in common chickweed are slightly toxic but will only have an effect if ingested in huge quantities.

White mouth dayflower (Commelina erecta) is a perennial wildflower found in coastal uplands, scrub habitats, and pinelands. The flower consists of two large petals situated right at the top of the stem. These blooms are purplish-blue, and there's a much smaller white petal below these two. This is why the flower has "White Mouth" in its name.

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.

Prostrate sandmat (Euphorbia prostrata) is a plant species native to tropical regions of North and South America and the central United States. Prostrate sandmat has spread all over the globe and is considered an invasive species. This resilient plant often sprouts up through cracks in asphalt on roadsides.

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.