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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.
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 .
A straight, stiff hair (smooth or with minute teeth); the upper part of an awn (when the latter is bent and has a lower, stouter, and usually twisted part, called the column). brochidodromous Pinnate leaf venation in which the secondary vein s do not terminate at the leaf margin, but are joined in a succession of prominent arcs. brochus. pl. brochi
The flowers instead have prickles that form from the skin of the plant, similar to how hair grows. Prickles have been around for at least 400 million years, dating back to when ferns and their ...
The homology of leaves is an easy conclusion to make. The plant morphologist goes further, and discovers that the spines of cactus also share the same basic structure and development as leaves in other plants, and therefore cactus spines are homologous to leaves as well.
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.
Aculeate – having a covering of prickles or needle-like growth. Aculeolate – having spine-like processes. Aden – a gland. Adenoid – gland-like. Adenophore – a stalk that supports a gland. Adenophyllous – leaves with glands. Arachnoid – having entangled hairs that resemble cobwebs. Bloom – waxy coating that covers some plants.
From secretive TV ads in the 1950s to model Paulina Porizkova posting shower videos with the out-loud-and-proud gray hair statement, “For thos.