Abstract: The phenotypic diversity of R. praelucens from three natural populations and two
introduced populations in Shangrila County of Yunnan was investigated according to 23 morphological
traits. The results were the following：（1）Plants from HPC population were highest，with largest flowers
and hips producing most abundant and heaviest achenes. As for plants from NSC population，leaflet
number was the largest and the leaves were the longest. Although their pedicels were longest，their hips were
smallest and the achenes were lightest. Flowers of LHC population were most deep and variable in color.
The crowns of plants from FG population were largest，while the flowers were most abundant and variable
in petal number. The height，crowns，leaflets and flowers of plants from IAC population were all the
smallest，but all with the highest variation coefficient. Also，this population had the palest flower color and
the least achenes.（2）R. praelucens was rich in phenotypic variation. The average variation coefficient of
the studied traits reached 22.88%. The mean phenotypic differentiation coefficient was 69.56%，
demonstrating that differentiation among populations was the major source of variation. （3）Plants from the
IAC population and FG population were very close to those from NSC population and LHC population，
which suggested that they had been possibly transplanted directly or indirectly from these 2 locations and
then preserved. It is necessary to conserve more populations according to the phenotypic diversity and
variation pattern of Rosa praelucens. The integrality of populations should also be kept in order to preserve
as more ornamental traits as possible for further utilization.

Key words: Rosa praelucens, phenotypic diversity, phenotypic differentiation, conservation