Orchid course taught by Professor Liu Yan Open course of Beijing Forestry University

The course takes traditional flowers such as plum, orchid, bamboo, chrysanthemum, peony, peony, rose, lotus, ginkgo and magnolia as objects, from the perspective of science and flower culture, from two aspects of material wealth and spiritual wealth of flowers, according to different flowers, this paper introduces the flower name, germplasm resources, ornamental characteristics, ecological habits, cultivation history, flower culture and use of famous flowers. The course is refined on the basis of the national high-quality courses "ornamental Botany", "Garden Florology" and "Garden Tree Science" in Beijing. Through the study of this course, students can understand the cultivation and historical and cultural origin of Chinese famous flowers and the broad and profound Chinese flower culture, understand the general situation of wild resources and cultivated varieties of Chinese famous flowers, and improve the aesthetic ability of flowers. stimulate further interest in learning, play a role in carrying forward Chinese culture and inheriting Chinese material and spiritual civilization. Orchids are precious ornamental plants. According to incomplete statistics, there are more than 700 genera and 20,000 species in the world, and many new varieties are discovered and cultivated every year. In plant taxonomy, Orchidaceae belongs to Monocotyledon perennial Orchidaceae. National orchids are mainly spring orchid, lotus petal orchid, cymbidium, Jianlan, cold orchid, ink orchid, spring sword seven categories, there are thousands of horticultural varieties. China belongs to the country of origin, and it is also sold back to Taiwan and Japan. National orchid is a perennial herb. The root is fleshy, hairless and symbiotic. With false bulb, commonly known as Reed head, wrapped with leaf sheath, often multiple pseudobulbs connected together, existing in rows at the same time. Leaves linear or sword-shaped, leathery, erect or pendulous, flowers solitary or in racemes, pedicels bearing numerous bracts. Flowers bisexual, fragrant. Corolla consists of 3 sepals, 3 petals and core column. The middle one of the sepals is called the main lobe. The next two are the sidelobe, and the extension of the sidelobe is called household. The upper 2 petals are upright, fleshy, and the apex is curled inward, commonly known as holding. The following one is the lip flap, which is larger, commonly known as Lansun.