(2) Recto:  (Stamp) Grupo Escolar General Oraa 49-Madrid.  [November 17, 1937, Leaves flowers and fruit. Leaves are expansions of plants attached to stems; they are generally green. Their shapes are determined by the plant; the oak tree has them in the shape of lobes; bamboos have linear ones; bananas palm-shaped; acacias are made up of various little leaves etc. Flowers are a reproductive aparatus for many plants. Many of them are beautiful colors. The calyx is a type of cover in which the flower forms; it is formed by one].  Verso:o varios sépalos y tiene casi siempre color verde. La corola es lo llamado vulgarmente flor. La forma y disposición de los pétalos sirve mucho para clasificar una planta. Las flores que carecen de corola se llaman pétalos. Manolita Martinez [or more sepal and is almost always green.  The corolla is commonly called flower. The shape and arrangement of the petals are very important in classifying a plant. The flowers that grow on a corolla are called petals. Manolita Martinez].