Pteridophyte is a main kind of plants, a lower class of higher plants and the most primitive vascular plants. Pteridophytes, also known as ferns, have obvious generational alternation like bryophytes. Asexual reproduction produces spores, and sexual reproductive organs have sperm organs and archegonial organs. Sporophytes are far more developed than gametophytes, with differentiation of roots and leaves, and primitive vascular tissues form the vascular system. Pteridophytes are a large group between bryophytes and seed plants. Pteridophytes can be divided into five subfamilies: Pinus, Lycophyta, Isoetes, Wedelia and Pteridophyta. There are about 12000 species of ferns in existence, which are widely distributed all over the world, especially in the tropics and subtropics.

There are 223 genera and about 2,600 species of 6 1 family in China, which are mainly distributed in South China and Southwest China. There are more than 1,000 species of 1000 in Yunnan province alone, so it is known as the "Pteridophyte Kingdom" in China. For example, Selaginella Selaginella, Vitex negundo, Celastrus japonicus, Adiantum japonicum, Dryopteris squamosa, Pteris breviscapus, Pteris venus, Pteris nephrolepis, generally terrestrial, with epiphytic ferns such as Quercus, Pteris japonica, Pteris alopecuroides, etc., and aquatic ferns such as Azolla, Pteris japonica, and Pteris halophila (born on the beach); The vast majority of existing pteridophytes are herbs, but there are also some woody species, such as Alsophila spinulosa, which are small iron trees.

2. kudzu vine

Pueraria lobata is a kind of rattan. Scientific name: Cynanchum bungeanum, also known as Pueraria lobata, Pueraria lobata, Pueraria lobata, etc., is a vine of Convolvulaceae, with a height of 3 meters, a cylindrical stem and short fluff. Leaves alternate, broadly ovoid, long10.5-13.5cm, wide 5.5-12cm, with sharp or tapering apex, rounded or slightly heart-shaped base, glabrous leaves, gray-white fluff on the back, numerous lateral veins, parallel and protruding on the back of leaves. Born on slopes or in sparse forests in hilly areas, it is distributed at an altitude of about 300-1500m. Distributed in Southeast Asia and Australia, China, Guizhou, Guangxi and southeastern Yunnan.

Kudzu pictures