n.
Any of about 100 species in the genus Rosa (family Rosaceae) characterized by their beautiful, fragrant flowers.
Rosa species are probably the most widely recognized and universally favoured of ornamental flowering plants. Hundreds of varieties are cultivated in all types of settings, and there are many hybrids. Roses are susceptible to numerous diseases, most caused by fungi. The rose family contains about 3,000 species and accounts for 45% of the species in the rose order (Rosales). Other popular garden plants and ornamentals in the rose family include spirea , cinquefoil , hawthorn , mountain ash , and flowering cherry . The family also contains many important fruits, including the apple , peach , strawberry , pear , plum , apricot , almond , quince , blackberry , and raspberry . Plants of some species contain dangerous cyanide compounds. Many members have thorns or prickles.
Prairie rose ( Rosa setigera ).
John H. Gerard