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Cycad(Chinese Edition)

CHEN ZHANG PAN AI FANG

ISBN 10: 7503836393 / ISBN 13: 9787503836398
Neuf(s) Etat : New Couverture souple
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Paperback. Pub Date: 2004 Pages: 108 Language: Chinese in Publisher: China Forestry Publishing House cycad is the oldest existing sub relic plants. but also the most primitive population of seed plants. known as the giant panda of the plant kingdom said. Our country is one of the cycads in the world's most resource-rich countries with a long history of cultivation oldest. has a wide range of distribution to a wide. diverse habitats. evergreen. fortitude shape. long-lived. well received by the. N° de réf. du libraire CB013589

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Titre : Cycad(Chinese Edition)

Reliure : paperback

Etat du livre :New

A propos de ce titre

Synopsis :

苏铁是现存地球上最古老的子遗植物,也是种子植物中最原始的种群,素有"植物界的大熊猫"之称。我国是世界上苏铁类植物资源最丰富、栽培历史悠久最悠久的国家之一,具有种类繁多、分布地广、生境多样、四季常青、外形刚毅、寿命期长等特点,深受我国人民的喜爱。本书在简要阐述了苏铁及其近缘植物的形态特征、生长习性和常见特种特征的基础上,系统地介绍了苏铁类植物的各种繁殖方法、栽培管理要点、盆景制作技艺、病虫害防治知识以及苏铁的观赏价值与经济价值。以期为广大读者认识苏铁、莳养苏铁和应用提供有益的帮助。10A.羽片平展,边缘平11A.大孢子顶裂片比侧裂片长..............................篦齿苏铁11B.大孢子顶裂片比侧裂片短........................越南篦齿苏铁10B.羽片通常呈"v"字形开展,边缘稍反卷............灰千苏铁9B.树干不为灰白色,树皮不裂或块裂12A.树干基部膨大成圆盘状13A.树干高通常小于50cm,树皮块裂,粗糙,大孢子叶顶片后期褐色绒毛基本脱落,侧裂片无毛,种子小型,长1.7~2.7cm,径1.6-2.4cm,外种皮易与中种皮剥离,无海绵纤维层.........................................................石山苏铁13B.树干高可达1.5m,树皮光滑或块裂,大孢子叶顶片密被宿存绒毛,种子中型,长2.5~3.5cm,外种皮具海绵状纤维层,不易与中种皮分离.................................暹罗苏铁12B.树干基部通常不膨大成圆盘状14A.羽片厚革质,宽通常在1.2-1.6cm,大孢子叶顶片边缘齿裂,裂片短于1cm1.5A.胚珠具盘状珠托,大孢子叶顶片具1~3对波齿至钝齿,齿长lmm................................................爪哇苏铁15B.胚珠无盘状珠托,大孢子叶顶片具2~9对短齿,齿长l~10mm16A.树干密被宿存的叶痕,大孢子叶顶片具2-8对细齿,齿长2~10mm.......................................刺叶苏铁16B.树干上部叶痕宿存,下部光滑,叶痕脱落,大孢子叶顶片具5~9对短齿,齿长1-6mm..................................................................苏铁一种(未定名)14B.羽片革质至纸质,大孢子叶顶片边缘羽状至篦齿状分裂,裂片长于1cm17A.胚珠lO-14枚,树干粗壮,叶痕宽大,鳞叶长达20cm,宽5cm,具黄褐色长粗毛,羽片长36~40cm,宽14~16mm...................................................多胚苏铁17B.胚珠2~8(10)枚,叶痕宿存或脱落,鳞叶宽通常短于3.5cm,具棕色短绒毛18A.大孢子叶顶片卵圆形,边缘具13~20对侧裂片,胚珠无毛与疏被毛并存,羽片长25~38cm,宽1.4~1.5cm......................................................滇南苏铁18B.胚珠无毛19A.树干通常可达1m以上,有时达5~6m,小孢子叶粗大,长40~60(75)cm,径8~15era,大孢子叶宽大,侧裂片粗壮20A.大孢子叶顶裂片不明显,与侧裂片近等大,羽叶坚挺而直伸,幼时锈色........................四川苏铁20B.大孢子叶顶裂片显著,明显比侧裂片宽大,羽叶上部通常细软而弯垂21A.大孢子叶顶裂片三角形,远比侧裂片宽大,边缘具细锯齿或浅裂,有时钻形,比侧裂片稍大,不裂或边缘深裂;大孢子叶球开花时仍紧包,胚珠先端中间凹,种子11~12月成熟,此时

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