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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.
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.
Prickles, thorns and spines are all modified plant tissues that have evolved to prevent or limit herbivory, these structures have evolved independently a number of times. [215] Stimulant toxins: plants which are only distantly related to each other, such as coffee and tea, produce caffeine to deter predators. [216]
Get ready for all of today's NYT 'Connections’ hints and answers for #587 on Saturday, January 18, 2025. Today's NYT Connections puzzle for Saturday, January 18, 2025 The New York Times
The spines are the relatively large, radiating organs; the glochids are the fine prickles in the centres of the bunches. Glochids ( Opuntia microdasys monstrose ) Glochids or glochidia ( sg. : "glochidium") are hair-like spines or short prickles, generally barbed, found on the areoles of cacti in the sub-family Opuntioideae .
In many cases, spines are a defense mechanism that help protect the animal against potential predators. Because spines are sharp, they can puncture skin and inflict pain and damage which may cause the predator to avoid that species from that point on. The spine of some animals are capable of injecting venom. In the case of some large species of ...
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Paliurus spina-christi, commonly known as Jerusalem thorn, garland thorn, Christ's thorn, or crown of thorns, is a species of Paliurus native to the Mediterranean region, Southwest Asia and Central Asia, from Morocco and Spain east to Iran and Tajikistan.