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Cactus glochids easily detach from the plant and lodge in the skin, causing irritation upon contact. The tufts of glochids in the areoles nearly cover the stem surfaces of some cactus species, each tuft containing hundreds of glochids; this may be in addition to, or instead of, the larger, more conspicuous cactus spines , which do not readily ...
Stenocereus griseus is a tree-shaped cactus that grows to 6-9 meters tall with a clear trunk and upright green stems, about 9-12 centimeters in diameter, with six to ten ribs below the areoles. [2] It bears one to three central spines up to 1.5 centimeters long, the longest of which reaches 4 centimeters, and six to eleven marginal spines ...
A structure on the stem node of a cactus, morphologically a specialised branch; the region of a cactus upon which spine s, glochid s, and flowers are borne. aril A membranous or fleshy appendage formed by expansion of the funicle which partly or wholly covers a seed , e.g. the fleshy outer layer of lychee fruit, or that found in members of the ...
Sclerocactus papyracanthus is a species of cactus known by the common names paperspine fishhook cactus, [3] grama grass cactus, paper-spined cactus, and toumeya. It is native to North America, where it occurs from Arizona to New Mexico to Texas and into Chihuahua , Northeastern Mexico.
Tephrocactus articulatus is a species of cactus in the subfamily Opuntioideae of the plant family Cactaceae. They usually grow branches up to one foot tall with white flowers. Its most notable feature are its needles or spines which, if present, are flat and resemble parchment. [2] Propagation is usually through cuttings.
Acanthochronology is the study of cactus spines or Euphorbia thorns grown in time ordered sequence (i.e. in series). Physical, morphological or chemical characteristics and information about the relative order or absolute age of the spines or thorns is used to study past climate or plant physiology.
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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.