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Helminthotheca echioides, known as bristly (or prickly) oxtongue, is a sprawling annual or biennial herb native to Europe and North Africa.It was originally placed within the genus Picris but is often separated within the small genus Helminthotheca alongside a few other (mainly North African) plants which also have the distinctive outer row of bracts around the flowerheads.
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.
Hieracium horridum. Hieracium horridum, [1] known as the prickly hawkweed [2] or shaggy hawkweed, is a species of plant in the family Asteraceae. It gets its name from the long, dense, shaggy white to brown hairs (trichomes) which cover all of the plant parts [3] of this plant species. [4] The species is native to Oregon, California, and Nevada ...
Description. Urtica dioica is a dioecious, herbaceous, perennial plant, 3 to 7 feet (0.9 to 2 metres) tall in the summer and dying down to the ground in winter. [6] It has widely spreading rhizomes and stolons, which are bright yellow, as are the roots. The soft, green leaves are 1 to 6 inches (30 to 200 mm) long and are borne oppositely on an ...
Binomial name. Extatosoma tiaratum. (Macleay, 1826) Extatosoma tiaratum, commonly known as the spiny leaf insect, the giant prickly stick insect, [2] Macleay's spectre, [3] or the Australian walking stick, is a large species of Australian stick insect. [4][5] The species has the Phasmid Study Group number PSG9. [6]
Lactuca serriola, also called prickly lettuce, [2] milk thistle[2] (not to be confused with Silybum marianum, also called milk thistle), compass plant, [2] and scarole, [2] is an annual or biennial plant in the tribe Cichorieae within the family Asteraceae. It has a slightly fetid odor and is commonly considered a weed of orchards, roadsides ...
Amaranthus spinosus, commonly known as the spiny amaranth, [2] spiny pigweed, prickly amaranth or thorny amaranth, is a plant that is native to the tropical Americas, but is present on most continents as an introduced species and sometimes a noxious weed. [citation needed] It can be a serious weed of rice cultivation in Asia.
Onopordum acanthium (cotton thistle, Scotch (or Scottish) thistle) is a flowering plant in the family Asteraceae. It is native to Europe and Western Asia from the Iberian Peninsula east to Kazakhstan, and north to central Scandinavia, and widely naturalised elsewhere, [1][2][3] with especially large populations present in the United States and ...