Ecological significance of diversity in leaf tissue architecture of some species/cultivars of the genus Rosa
Evolution by reticulation: European dog roses originated by multiple hybridization across the genus Rosa
The end of the book contains classification of the genus Rosa
as set out by the American Rose Society and the World Federation of Rose Societies to reflect botanical and evolutionary progress of the rose.
In nature, the genus Rosa
has some 150 species spread throughout the northern hemisphere, from Alaska to Mexico and including northern Africa.
Shakespeare had it right: A rose (genus Rosa
, according to my guides) by any other name would smell as sweet.
Hundreds of hybrids and varietals of the genus Rosa
, extracted from species found all around the world, contribute to the 35- to 40-million rose plants sold to gardeners in this country every year.
The genus Rosa
is widely distributed all over the world with approximately 200 species and 20,000 cultivar (Gudin, 2000).