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Datura stramonium, known by the common names thornapple, jimsonweed (jimson weed), or devil's trumpet, [2] is a poisonous flowering plant in the Daturae tribe of the nightshade family Solanaceae. [3] Its likely origin was in Central America , [ 2 ] [ 4 ] and it has been introduced in many world regions.
This perennial grass weed is recognized by its tall, upright stems and distinctive seed heads with three to seven spikes radiating from a central point. It thrives in warm climates and fertile ...
Prickles on a blackberry branch. In plant morphology, thorns, spines, and prickles, and in general spinose structures (sometimes called spinose teeth or spinose apical processes), are hard, rigid extensions or modifications of leaves, roots, stems, or buds with sharp, stiff ends, and generally serve the same function: physically defending plants against herbivory.
Thlaspi arvense is a foetid, hairless annual plant, growing up to 60 cm (24 in) tall, [2] with upright branches. The stem leaves are arrow-shaped, narrow and toothed. It blooms between May and July, with racemes or spikes of small white flowers that have 4 sepals and 4 longer petals. [3]
Peperomia pellucida (also known by common names pepper elder, shining bush plant, crab claw herb, and man to man) is an annual, shallow-rooted herb, usually growing to a height of about 15 to 45 cm (6 to 18 inches), it is characterized by succulent stems, shiny, heart-shaped, fleshy leaves and tiny, dot-like seeds attached to several fruiting spikes.
Thumbtack-like Tribulus terrestris burs are a hazard to bare feet and bicycle tires.. After the flower blooms, a fruit develops that easily falls apart into five burs. [3] The burs are hard and bear two to four sharp spines, [3] 10 mm (0.39 in) long and 4–6 mm (0.16–0.24 in) broad point-to-point.
It produces horizontal stems, otherwise known as stolons, that can sprout up to 10 metres (33 ft) in length and thanks to its hollow stems, floats easily. This results in large clusters of stem amassing and create dense mats along the surface. [5] Bisexual flowers are small, white, and born on dense, axillary spikes (type of raceme). [6]
It grows as a roadside weed in some places. This is an annual herb growing from a taproot and reaching maximum heights near 40 centimeters. The stem and oval-shaped leaves are covered in soft hairs. The inflorescences are coiled spikes of white flowers with fuzzy or bristly sepals. Each flower is just a few millimeters wide. The fruit is a ...