The majority of rose species are indigenous to Asia; fewer are found in North America, Europe, and northwest Africa. Roses from many parts of the world can easily hybridize to create new kinds. quickly producing kinds that cross over into the parental forms, making the identification of fundamental species challenging. Less than ten species—most of which are native to Asia—participated in the crossbreeding that led to the variety of garden roses that exist today. Roses are bushes that grow upright, climb, or trail; their stems are typically heavily studded with thorns, which are little, sharp prickles of varied sizes. The leaves are pinnately complex, or feather-formed, and typically have alternating, oval leaflets with sharp teeth. While cultivated roses frequently have double (i.e., several sets of petals) blossoms, wild roses typically have five petals. Rose blossoms come in a variety of sizes, from tiny miniatures with a diameter of 1.25 cm (0.5 inch) to hybrid flowers that are larger than those of other flowers.
The floral cup, or hip, is the fleshy, occasionally edible, berry-like "fruit" of the rose plant. Its color often varies from red to orange.
Numerous diseases, the most of which are caused by fungus, can infect roses. On the surface of immature leaves and stems, powdery mildew manifests as a grayish white, mold-like development. The black spot fungus gives leaves noticeable black spots that eventually fall off. Another typical rose ailment is rust. On leaves and young stems, aphids are a frequent insect nuisance.
Known as a hip, the floral cup, which is actually the fleshy, sometimes edible, berry-like "fruit" of the rose plant, typically has a red to orange color.
Many diseases, most of which are caused by fungi, can infect roses. On the surface of immature leaves and stems, powdery mildew takes the form of a grayish white, mold-like development. Leaves with noticeable black spots that fall off are caused by the black spot fungus. Moreover, rust is a prevalent rose disease. On the leaves and young stems, aphids are a frequent nuisance insect.
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