Rosa Canina
Rosa canina is a variable scrambling rose species native to Europe, northwest Africa and western Asia.
It is a deciduous shrub normally ranging in height from 1-5 m, though sometimes it can scramble higher into the crowns of taller trees. Its stems are covered with small, sharp, hooked prickles, which aid it in climbing. The leaves are pinnate, with 5-7 leaflets. The flowers are usually pale pink, but can vary between a deep pink and white. They are 4-6 cm diameter with five petals, and mature into an oval 1.5-2 cm red-orange fruit, or hip.
Rosa canina is a variable scrambling rose species native to Europe, northwest Africa and western Asia.
The Dog Doses, the Canina section of the genus Rosa (20-30 species and subspecies, which occur mostly in Northern and Central Europe), have a unique kind of meiosis. Regardless of ploidy level, only seven bivalents are formed leaving the other chromosomes as univalents. Univalents are included in egg cells, but not in pollen. Dog Roses are most commonly pentaploid, i.e. five times the base number of seven chromosomes for the genus Rosa, but may be tetraploid or hexaploid as well.
Source: en.wikipedia.org/wiki/Rosa_canina - 13.06.2010
Rosa canina
The filled cultivated form of the Roses may be very beautiful, but a big Dog Rose in the free Nature with its gentle blossoms in my eyes betters them all.