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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.
Some cacti have taproots; in genera such as Ariocarpus, these are considerably larger and of a greater volume than the body. Taproots may aid in stabilizing the larger columnar cacti. [16] Climbing, creeping and epiphytic cacti may have only adventitious roots, produced along the stems where these come into contact with a rooting medium. [11]
Most cacti possess spines, some large enough to cause serious wounds. Glochids however, though smaller, commonly induce more troublesome, more persistent, dermatological manifestations in humans. Though minute, glochids commonly are barbed and once they have penetrated the skin barbed glochids are practically impossible to dislodge without ...
Rebutiinae are large tree-like or shrubby plants. Their columnar shoots are articulated or not articulated. The ribs are usually heavily spined. The medium to large flowers appearing on the side usually open at night. Their pericarpel has imbricated scales. The areoles have thorns or bristles.
The thorns are very variable. The diurnal, funnel- or bell-shaped flowers appear at or near the apex. They are white or pink, sometimes yellow or bright red. The flower cup and the corolla are covered with a few large, broad and obtuse scales that have membranous edges. The areoles are bare. The perianth is usually spread. The stamens form two ...
Prickly pear cactus have flat, oval pads covered in spines. Pollinators love the pink blossoms, and the flowers are a beautiful contrast to the the stark spines of this plant. There are many ...
An example of leaf surface reduction is the spines of a cactus, while the effects of compaction and reduction of branching can be seen in the barrel cacti. Other xerophytes may have their leaves compacted at the base, as in a basal rosette, which may be smaller than the plant's flower.
Sunlight. The Thanksgiving cactus loves bright spots that aren't in direct sunlight. Too much sun can cause the plant to turn yellow rather than its beautiful green, so keeping it by a north- or ...