Evergreen Gang
Elderly Programme (coniferopsida)
1. Pinaceae (pinaceae) needle-shaped or strip leaves, leaf, and large and small sporophylls are spirally arranged; small fertile leaves with two pollen sacs, most of them have air bags microspore; beads and bud scales separate scales, scales with each bead two ovules develop into 2 seeds. Seeds often winged. A total of 10 genera and about 230 species of 10 genera are produced in China, about 100 species.
Pines (pinus) evergreen trees, single-axis branch, trunk upright, lateral branches often whorled. With long branches and short branches; long branches Health scale leaves, very short axillary spur endogenous, 1 apical spur leaves needle beam, each beam is usually 2,3 or 5 leaves, often film-like base sheath surrounded. Microspore leaves the ball (male cone) Poly was born in the newborn most often long branch near the base. Microspore with airbags on both sides, adapted to wind dissemination. Megasporophyll ball (female cone) 1 was born in a number of new branches on top. Spring flowering pollination, the second year after fertilization, the formation of large growth cone sporophylls balls, beads and a species of woody scales scales, not falling, seed beads and scales with the separation of part of the formation of the wing skin to facilitate transmission of wind. About 80 species of mostly temperate and subtropical coniferous forests or mixed coniferous or constructive species dominant species, there is also an important timber species. Such as a bunch of pine needles two (p. massoniana lamb.) And taiwanensis (p. taiwanensis hayata); a bunch of needles, such as three bungeana (p. bungeana zucc. Et endl.) And pine ( p.armandii franch.); have a bunch of pine needles of 5 (p. koraiensis sieb. et zucc.) and the Japanese five-needle pine (p. parviflora sieb. et zucc.) and so on.
Abies (abies) evergreen trees, branches and retuse leaves with round marks. Leaf solitary, 2 micro crack tip. Cones upright, when mature, seed shed scales and seeds together. About 50 kinds of distribution in Asia, Europe, North America and northern mountain areas of Africa. China has nearly 20 species, often composed of a large area of forest, is an excellent timber and garden trees. Such as Abies Northeast (a. nephrolepis (trautv.) maxim.); Southwest China fir (a. fabri (mast.) craib); East China Abies (a. beshanzuensis mhwu), producing hundreds in southern Zhejiang Zu Mountain, existing only three mother trees, is highly endangered, and are classified as national level to protect plants.
Money Pinus (pseudolarix) deciduous tree with long branches, spur of the points. Leaf strip, spur leaves on the flat cylindrical radiation coils, like yellow autumn of money; cone year maturity. This is only the money loose (p. kaempferi (lindl.) gord.) 1 species, our specialty, the local distribution of eastern and central regions, is of the endangered state of the quilt as a national secondary protection. Straight wood grain, Shuzi beautiful, is an excellent timber tree species and one of the world's top five garden.
In addition, undergraduate as well as silver fir (cathaya argyrophylla chun et kuang), as the focus of a protected plant; cedar [cedrus deodara (roxb.) g.don] and Tsuga (tsuga), Douglas fir is (pseudotsuga) , larch (larix), and Picea (picea) of some species.
2. Taxodiaceae (taxodiaceae) judd System (1999) to undergraduate and Ru Boke, easy to book for teaching is still separate.
Evergreen or deciduous trees, no long, spur of the points. Strip leaves lanceolate, subulate, linear or scale-like, spirally arranged or in leave two. Size of the spores spirally arranged leaves, thin to the students. Microspore leaves often with 3-4 pollen sacs, the small spores without airbags. Bud scales and the scales of beads semi-Sheng, Zhu ventral scales are 2-9 ovules. Year cones mature, woody or leathery scales species, with 2-9 seeds. About 9 genera and 16 species of 5 genera, about 10 species. |
coniferales