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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.
Gymnosporia heterophylla, the common spike-thorn, is a small, hardy, deciduous African tree up to 5m tall, occurring in rocky places with a wide distribution from Ethiopia, the Sudan and the Congo, south to the Cape Province and west to Angola and Namibia, as well as the neighbouring islands of Madagascar and Saint Helena, with a closely related species from Mauritius.
It needs to be added that certain cacti have spines (not thorns) which are longer. The leaves are green, slightly paler on underside, glabrous , often borne clustered on very short dwarf spur-branchlets in the axils of the spines or infrequently on young spines or arranged spirally on new growth.
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For example, the article says that spines are derived from leaves, but none of the four sources I listed at User:Peter coxhead/Work page#Spines vs. thorns restrict the term to leaf-derived structures. Also, the use of spinosus as an epithet is relevant; many plants with such names have what the article calls "thorns", e.g. Prunus spinosa.
Flowers occur as clusters of off-white or cream-coloured terminal spikes which are fragrant and bloom during spring and summer. [1] The timber, resembling that of Acacia melanoxylon , often has heart rot , but when sound is of good quality and handsomely streaked in black, dark brown, purple and cream, with markedly contrasting off-white sapwood.
Wait-a-minute tree, wait-a-bit tree, or wait-a-bit plant are common names for a variety of prickly plants that catch onto passers-by. These names come from the fact that the stems or other parts of the plant have numerous hooked thorns that tend to hook onto passers-by; the hooked person must stop ("wait a minute") to remove the thorns carefully to avoid injury or shredded clothing.
Putterlickia, variously called spikethorns, false spike thorns, mock spike thorns and bastard spike thorns, are a genus of flowering plants in the staff vine and bittersweet family Celastraceae, native to South Africa, Eswatini and Mozambique. Endophytic bacteria in their roots produce maytansine.