THE CHROMOSOME OBSERVATION ON 5 SPECIES OF RARE PLANTS OF CHINA

The chromosome numbers of five species of precious rare and endangered plants are reported as follows:1. Amygdalus mongolia (Maxim) Yu 2ⁿ=16; 2. Kolkwitzia amabilis Graebe 2ⁿ=32; 3. Magnolia amena Cheng 2ⁿ=38; 4. Davidia involucrata var. vilmoriniana (Dode) Wanger 2ⁿ=42; 5. Fritillaria ussuriensis Maxim 2ⁿ=22. Among them, chromosome numbers of M. amena, D. involcrata var. vilmoriniana are reported here for the first time. They are important genetic resources of China. The results will provide cytological information for their conservation, utilization and development.