本文简略回顾了现存苏铁分类历史，着重介绍了最近史蒂文森分类系统和中国苏铁分类中采用的系统。

The present paper discusses the follwing points: 1. Origin and distribution of cycads; 2. A list of Cycas of the world. 3. On Asian Cycas. A new species of Cycas from Guangxi (C. shiwandashanica Cheng et Y. C. Zhong) is described.

本文概略回顾了中国苏铁属分类历史，根据最近我国考察苏铁属丰富资料和模式标本考证，对中国的苏铁属进行了分类学修订，列出了分种检索表。

四川苏铁通常被认为四川特产，野生种群已绝灭。据作者调查与考证，模式产地峨眉山四川苏铁约有13株，均为雌株，为清代僧人引自我国南部某地的同一雌株或不同雌株，四川各地栽培的四川苏铁很可能直接或间接源于峨眉山的四川苏铁，四川苏铁的原产地在我国南部某省区，而非四川。

广西是我国苏铁属植物的主要产区之一，目前已知有苏铁、叉叶苏铁、石山苏铁、南盘江苏铁、宽叶苏铁和十万大山苏铁等6种，广东苏铁在桂东有野生。其中叉叶苏铁、宽叶苏铁和十万大山苏铁的资源稀少，环境不断恶化，处于十分濒危的状态，极需采取得力措施加以保护。

本文对南盘江地区的贵州苏铁的变异类型进行了初步研究，按照变异情况可以划分为模式型、宽叶型、窄叶型、叉孢型四种变异类型，并对其主要特征和分布情况进行了简述。

本文报道贵州产野生苏铁属植物一新记录种——云南苏铁(Cycas sinamensis Miq.)

铁雄果属—Androstrobus在我国首次发现于四川攀枝花上三迭统，在同一层位中同时有保存极好的蕉羽叶一Nilssonia，因此有一定意义，本文特作一简报。

攀枝花苏铁具二种类型的根: 1. 向地下生长的直根系，有次生生长，维管射线由异型薄壁细胞组成。2．向地面生长的珊瑚根中具藻带层，共生藻类属念珠藻属(Nostoc)，项圈藻属(Anabaena)。小叶片边缘木反卷，叶肉分化，具单脉，木质部发育为中始式，气孔为单环型。叶脉、叶柄、上胚轴的维管束均为外韧型。组成后生木质部的管状分子，除环纹、螺纹管胞外，还有较多的长度缩短、直径增大，末端壁倾斜至垂直的单列、双列的具缘孔纹管胞。

The microspores of Cycas panzhihuaensis form in early April. After their formation, the microspores take the first mitosis, forming a small persistent prothallial cell and a larger antheridial initial. Then,the antheridial initial is divided, froming two unepual cells, a tube cell and a generative cell. The mature pollen is shed form the microsporangium at the end of April or the early May. The megaspore germinates around April 20th. It begins with a period of free nuclear division and the size of female gametophyte has been formed. The pollen grains begin to germinate in the pollen chamber 3 days after pollination. Sixteen days latter, the pollen tube grows and its length 20 cm, and meanwhile two archegonia begin to develope at the edge of female gametophyte in the micropyle end. In the early of June, the archegonium is typical, it is composed of two neck cells, a central cell and a jacket layer. The central cell enlarges and app roaches its full size in the middle of July, its length is 1.51mm and its diameter 0. 5-0. 7mm.

本文采用光镜(LM)、扫描电镜(SEM)相结合的方法，对产于我国的13种苏铁的表皮特征进行了比较研究。篦齿苏铁、攀枝花苏铁、台东苏铁及苏铁的气孔为一种类型，明显不同于另外9种苏铁的气孔。结果支持C. taitungensis（台东苏铁）成立。根据叶表皮特征，作者还对这边13种苏铁的系统位置进行了初步探讨。

本文讨论了产于中国台湾省的台东苏铁(Cycas taitungensis)和产于四川省的攀枝花苏铁 (C. panzhihuaensis)的两个天然群落，比较了两者的地理位置、地质、古地理环境、生境、群落的植物种类组成及其两者的相关性。 我们认为： 1．两个群落分别位于中国东部与西部，相距遥远，分布区虽均位于中国亚热带常绿阔叶林区，但植物组成分别属于东部湿润与西部半湿润亚区，前者系中国一日本区系成份，与大陆东南沿海关系密切，并结合形态特征及地质与古地理环境推论台东苏铁与产于广东的广东苏铁(C. taiwaniana Carruth.) 、海南苏铁(C. hainanensis C.J．Chen)以及贵州苏铁(C.guizhouensis Lan et R.F. Zou)可能是同一种群的地理种; 而后者属中国—喜马拉雅区系。两地的苏铁群落有共同区系起源，后在各自地理环境下分化; 2．两地山脉均为南北走向，有利于在冰川时期植物的迁移与保存; 3．两地群落均为次生性，具有多岩瘠薄的相似生境，其相似性可能是残遗植物在生存竞争中更多依赖于不利的生境。

In 1980s, relict living cycad floras were found respectively in Panzhihua of Sichuan and yunnan located in Jinsha River valley of southwest China. The Baoding cycad fossil community is one of living cycad forests of richest Mesozoic fossil floras, the panzhihua cycad forest is the biggest one of living cycad forests in East Asia. The time between these two floras is after an interval of about 200 million years. They appear to have Aome to historical relationship. The present paper also discusses the origin of panzhihua cycad. The Kam-Yunnania is the important place of orign of Mesozoic cycads. Panzhihua (Baoding) region is very abundant in cycad fossils[6], which are older than those from South China and from othet Eurasian regions. Based on geological records, C. panzhihuaensis might be considered to originate in situ and to be offsprings of the Mesozoic cycads. It is suggested that proper measures should be taken immediately to protect and conserve such endangered species and to bring its consetvarin into line with the Action Plan of IUCN.

国家珍稀濒危保护植物—叉叶苏铁，经过栽培，在广西南宁人民公园首次开花结实。本文记录了1992年10月至1994年4月笔者对叉叶苏铁的野外调查和引种后的生长发育、物候期观察等情况。

A wind and insect exclusion pollination experiment was conducted in a wild population of the cycad Zamia pumila L. in Florida. Cones from which insects but not wind were excluded produced no viable seeds, while cones from which wind but not insects were excluded produced abundant viable seeds. Two beetle species have been identified which may be effecting pollination. Adults and larvae of both beetles are found abundantly on the male cones, and adults of both species and larvae of one species are found occasionally on female cones. Z. pumila produces sugar and amino acid-rich micropyle droplets which may serve as pollinator rewards. Mimicry of resource-rich male cones by female cones and the use of cones as refuges between mating and feeding bouts may account for beetle movement from male to female cones.

苏铁与云南苏铁杂交于1986年获得成功。子代经七年生长观察，其外部特征：茎上复被鳞状叶及残留的叶柄，羽状叶裂片薄革质，边缘略反卷，中部裂片长12—15厘米，宽0.7一0.8厘米，叶间距0.8—1厘米; 叶柄两侧具锐刺。

本文主要研究贵州苏铁C. guizhouensis Lan et R. F. Zou的繁殖问题。播种繁殖：12月或翌年元月采种，随采随播或干藏一段时间后播种，一般6月中旬可陆续出土。分割繁殖：又分为切茎和切芽，切茎可横切或纵切，埋土后覆草保湿，切芽宜在茎与芽的交界处切，即可插入湿润土壤中。分割繁殖一般经1年左右便可形成新的植株。

本文主要通过贵州苏铁种内靠接试验，探讨苏铁植物嫁接的可能性。

本文介绍了迁地保护的苏铁类植物，包括4属21种的主要形态特征、生物学特性、繁殖栽培技术及其利用价值，并提出了该类植物扩大保护和加强利用的建议。

There are 1 order 3 families 11 genera about 180 species of living cycads which are mainly distributed over tropics and subtropics in the world. Mexico, West Indian Islands,Australia, Southern America and S. E. Asia are thier distributional centres. But there are only 1 family 1 genus(Cycas) with about 13 species which scattered in Yunnan(+7 spp. ), Guangxi(+3 Spp. ), Sichuan(2 spp. ), Guangdong(1 spp), Hainan(1 sp. ), Fujian (1. sp),Guizhou (+1 sp. ) and Taiwan(1 sp. ) in China. Since eycads are favourite gardening trees for their elegant appearance. Large quantities of wild cycads were dug up and a lot of habitats of cycads were destroyed especially in early 1980's in China. It is pressed for time to conserve endangered cycads. According to China Red Data Book Cycas micholitzii and Cycas panzhihuaensis were listed as Grade 2, while Cycas pectinata, Cycas siamensis, Cycas taiwaniana as Grade 3 protected plants. Three reserves have been set for the protection of Cycas panzhihuaensis and Cycas taitungensis in China. They are the Panzhihua Nature Reserve, Sichuan Province, the Puduhe Natural Reserve, Luquan, Yunnan Province and the Taitung Hong-yeh Village Taitung Cycas Nature Reserve. However, ex situ conservation of cycads in China does not seem satisfactory. Many botanical gardens introduced cycads in China just for supplementary collection. But Shenzhen Fairy Lake Botanical Garden (SFL) is devoting herself much to cycads ex situ conservation. The climate of Shenzhen with annual average tempreture 22.1℃, annual average rain-fall 1992.2mm, the diverse microhabitats of the garden for its hilly terrain fit growth of cycads very much. SFL begun to introduce cycads in 1988 for its cycad collection and decided to prepare cycads ex situ conservation center last year. More than 50 idividuals each species from various wild population are needed in general and a data base of cycads is building in the garden. This project has been practising in three periods as follows: 1. Collecting Period from 1992 to 1994, became the largest ex situ conservation centre of cycads in China with 0.8 hectare and more than 80 species. 2. Enriching Period from 1995 to 1996, tries to become one of the largest ex situ conservation centers of cycads in Asia with 1.2 hectares and more than 120 species. 3. Research Period till 1997, tries to become one of the largest ex situ conservation and research centres of cycads in the world with 2 hectares and more than 150 species and a large cycad herbarium and laboratory.