园林树木学被子植物门1-1.ppt

野核桃 J.Cathyana 小枝有毛，小叶15-19枚，叶有锯齿，雄花 20-30，雌花5-10。 Wingnut 枫杨属 Pterocarya They are deciduous trees, 10-40m tall, with pinnate leaves 20-45cm long, with 11-25 leaflets; the shoots have chambered pith, a character shared with the walnuts(Juglans). The flowers are monoecious, in catkins. The seed catkins when mature (about 6 months after pollination) are pendulous(下垂）, 15-45 cm long, with 20-80 seeds strung along them. The seeds are a small nut 5-10 mm across, with two wings, one each side. In some of the species, the wings are short (5-10 mm) and broad (5-10 mm), in others longer (10-25 mm) and narrower (2-5 mm). 枫杨属 Pterocarya 形态特征： 落叶乔木，枝髓片状，冬芽有柄，裸露或具数 脱落鳞片；奇数羽状复叶，小叶有锯齿；雄花 序生于去年侧枝，雌花序生于新枝顶端；果序 下垂，坚果有两小苞片发育而成的翅。 共约9种，中国7种，园林常见枫杨。 枫杨 Pterocarya stenoptera 枝髓片状，羽状复叶叶轴有翼，小叶９－23，缘有细锯齿，果序下垂，长20-30cm，坚果球形。 枫杨适应性强，病虫害耐湿性强，水边绿化的好材料，也可做行道树，但落叶期长，不好扫地，所以公路绿化较好，公园工厂绿化 Hickory山核桃属 Carya The hickories are large, deciduous trees which tend to form upright, cylindrical crowns when grown in the open. All species have pronounced taproots which securely anchor the trees, if soil conditions allow deep root development Hickories have alternate, exstipulate（无托叶的）, odd pinnately compound leaves which are aromatic when crushed. Leaflets are lanceolate to obovate with serrate edges (except in the Asian Carya sinensis (section Rhamphocarya) which has entire leaflet margins). ） Fruit matures and falls in the autumn. The outer husk dehisces（裂开） along sutures（缝合处） (more or less, depending on species and genotype) and either releases the hard shelled nut or falls still encasing the nut. Fruit production tends to be cyclic, with heavy crops produced in alternate years, with less pronounced cycles of longer duration in pecan（美洲山核桃) 山核桃属 Carya 形态 （1）落叶乔木，枝髓充实；（2）雄花序为3出柔荑花 序；（3）核果外果皮木质，4瓣裂。 薄壳山核桃（长山核桃、美国山核桃）Carya illinoensis鳞芽，小叶11-17，有毛，叶脉不对称，果长圆形，较大，核壳较薄，原产美国及墨西哥，现在我国栽培很广。 习性 喜温暖，潮湿，耐水湿、干旱，姿态优美。 应用 园林中常