1. Many of Polygonaceae are noxious weeds , some ornamentals , and buckwheat ( Fagopyrum ) and rhubarb ( Rheum ) foodstuffs .

2. Flower size variation at the inflorescence and individual levels and its trade-off with flower number were evaluated in annual herb, Polygonum hydropiper(Polygonaceae).

3. Galerucella grisescens is an important natural enemy which could significantly control Polygonaceae weeds in tobacco fields.

4. Many plant species with antimicrobial activities are mainly among the families Compositae, Labiatae, Leguminosae, Liliaceae, Polygonaceae and Umbelliferae.

5. Object To establish a new method for the identification of Yangti (Chinese herb from Rumex L. , Polygonaceae) by near infrared diffuse reflectance spectrometry.

6. In the present paper, geographic distribution patterns of pollen types of Polygonaceae and their relationship to ecological factors are first introduced.

7. Dominant families are mainly Rosaceae, Leguminosae, Labiatae, Compositae and Polygonaceae.