Which two painters are "Ivy and Poplar"? What are their main contributions to the development of flower-and-bird painting in China?

1. Xu Wei and Chen Chun, the representative painters of freehand flower-and-bird painting in Ming Dynasty, were praised by later generations as "green vines and white sunshine".

2. Xu Wei's freehand brushwork of flowers and birds is unique. His flower-and-bird paintings are not influenced by different schools, and they are bold and creative. His freehand brushwork, whether flowers or flowers and birds, is a painting, and everything is between similarity and dissimilarity. For the flowers and trees of the four seasons in the works, the painter uses various forms of pen and ink such as hook, dot, splash and orchid to depict graceful peony, beautiful crape myrtle, sparse bamboo, aloof frost chrysanthemum and beautiful cold plum charm, stretching nine feet and five feet respectively. He also integrated vigorous brushwork into his paintings, which brought out the best in each other and gave people rich imagination.

3. Chen Chun's freehand brushwork of landscape flowers and birds without bones is very distinctive. In terms of freehand brushwork flowers, Chen Chun has a unique style and free brushwork. He is full of light and charm, and uses ink to set colors. As Xu Qin said, "The traces of light color and light ink are all gone!" During the Wanli period of the Ming Dynasty, it was once commented that Chen Chun surpassed Wen Zhiming in his attainments and reputation in flowers, and became the master of Wu Family after Shen Zhou. Since Ming and Qing Dynasties, painters, especially flower-and-bird paintings, have been deeply influenced by him.

Excerpted from the encyclopedia, after simple sorting, I hope I can help you.