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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.
Grapevine tendrils and leaves. Thorns. Cladodes. Aerial stem modifications are modifications to the aerial stems, [1] vegetative buds and floral buds of plants growing in different conditions and which perform functions such as climbing, protection, support, synthesis of food, or vegetative propagation.
B. decapetala is as a robust, thorny, evergreen shrub 2–4 m (6.6–13.1 ft) high or climber up to 10 m (33 ft) or higher; often forming dense thickets; the stems are covered with minute golden hair; the stem thorns are straight to hooked, numerous, and not in regular rows or confined to nodes.
The stem of a plant, especially a woody one; also used to mean a rootstock, or particularly a basal stem structure or storage organ from which new growth arises. Compare lignotuber. caudiciform Stem-like or caudex-like; sometimes used to mean "pachycaul", meaning "thick-stemmed". caudicle diminutive of caudex.
Individuals of this species are thorny herbaceous plant with many stems covered in serrated leaves and thorny buds and flowers. The plant has sinuses that are square and broad, its veins and margins are armored in thin spiky thorns. Argemone pinnatisecta has two to three sepals, six white petals, various stamens and bright yellow anthers. This ...
It has woody stems that are pale green in color and are glabrous, the youngest of which are often square-shaped. As the vine dies, the stem turns from green to a dark brown color. Along the stem there are often black-tipped thorns that are about 1/3-inch-long. Some stems of Common green brier do not have thorns.
The stem joints of several species, notably the jumping cholla (C. fulgida), are very brittle on young stems, readily breaking off when the barbed spines stick to clothing or animal fur as a method of vegetative reproduction. The barbed spines can remain embedded in the skin, causing discomfort and sometimes injury.
New twigs and stems are glabrous, with one year old bark a brownish purple, older growth is dull gray. The thorns found on twigs can be straight or recurved. Once the thorns have been on the tree for two years they are a shiny purplish black, and 4 to 7 cm long. Typically older branches and the trunk do not have thorns. [citation needed]