THE STRUCTURE OF A ROSE
We already know that roses come in different shapes, sizes and colors. As unique as they are, their anatomical characteristics resemble and are similar to other plant groups, however there are various details that separate them from other species. For those who love this flower, it is important that you understand the anatomy of it.
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Definition of receptacle
The receptacle or torus is the thickened part of a stem from which the flowerorgans grow. In some accessory fruits, for example the pome and strawberry, the receptacle gives rise to the edible part of the fruit.
Definition of stem
The stem holds the plant sap conductor and promotes the distribution of nutrients throughout the plant, from the root of the base to the flowers and leaves. The stem of the rose bushes are covered with thorns.
Definition of leaf
The leaves of roses are pinnately compound – that means they are made up of leaflets arranged along the side of a common axis with one leaflet on the end. Roses also have 3-leaflet leaves and many have 7-leaflets or more. The edge of the leaflet, usually “toothed” like a saw blade. Some roses have very smooth leaf margins, others are very deeply ‘dentate’ or toothed, as you can see on the picture.
Definition of prickle
Roses have prickles, not thorns. Prickles are spines like superfcial outgrowth of the epidermis of the stem.
Pointing or spinose processes can broadly be divided by the presence of vascular tissue: thorns and spines are derived from shoots and leaves respectively, and have vascular bundles inside, whereas prickles do not have vascular bundles inside, so they can be removed more easily.