枫杨中两性花的发现

中国科学院大学学报

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枫杨中两性花的发现

苏宋旺, 何家庆

(安徽大学生物系，合肥)

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1984-06-18 发布日期:1984-06-18
通讯作者: 苏宋旺

Discovery of Bisexual Flowers in Pterocarya Stenoptera C. DC.

Su Song-Wang, He Jia-Qing

(Department of Biology, Anhui University, Hefei)

Received:1900-01-01 Revised:1900-01-01 Online:1984-06-18 Published:1984-06-18
Contact: Su Song-Wang

摘要/Abstract

关键词: 胡桃科, 枫杨, 两性花

Abstract:

This paper reports the bisexual structure of the flowers of Pterocarya

stenoptera. The bisexual flowers are borne at the end of a leafy shoot of the current year

in many-flowered terminal pendulous catkins. They have the same structure as the general

female ones. Each flower grows in the axil of a bract, with a pair of bracteoles and four

small perianths. Each flower has two or three carpels in the centre of the flower, and upon

them there are two or three styles with stigmas on the inner face. They differ from the ge-

neral female ones in that each of them contains 4-6 stamens, forming a single whorl. The

stamens alternates with, or is opposite to, the perianth elements. Sometimes they contain

8 (-10) stamens, forming two whorls, with 6 in the outer whorl and 2 (-4) in the in-

ner whorl, and in this case the pistil in the bisexual flower of terminal catkins often becomes

a rudiment.

It is interesting that we have also found bisexual flowers in another tree, which are

borne in lateral male catkins. They have the same structure as general male ones, and the

pistils are often represented by a rudiment.

Manning (1940) points out that some female flowers of Pterocarya stenoptera and P.

fraxinifolia occasionally have stamens ( ? ) opposite the sepals. In P. stenoptera we have found

that both the stamens and the stigmas of bisexual flowers are functional. They are capable

of producing functional fruits. This is the same case as in Myrica Gale described by Davey

and Gibson (1917). Rendle (1952) points out that in the male flowers of Platycarya the

pistils often appeared as a rudiment. He considers, however, the male flowers derived from

the bisexual flowers with an indefinite number of stamens. The rudimentary pistils of later-

al male catkins in P. stenoptera we found are just the same as the ones found in Platycarya

by Rendle.

The discovery of the bisexual flowers in P. stenoptera may prove that the unisexual

flowers of the present-day Juglandaceae are derived from ancestors with bisexual flowers.

This tends to support the hypothesis that Cycadicae is the possible ancestor of the angiosperms.

Key words: Juglandaceae, Pterocarya stenoptera, bisexual flowers

苏宋旺, 何家庆. 枫杨中两性花的发现[J]. 中国科学院大学学报.

Su Song-Wang, He Jia-Qing. Discovery of Bisexual Flowers in Pterocarya Stenoptera C. DC.[J]. .

[1]	龙光日. 广西化香树属一新种[J]. 中国科学院大学学报, 1990, 28(4): 328-330.
[2]	路安民, 张志耘. 胡桃目的分化、进化和系统关系[J]. 中国科学院大学学报, 1990, 28(2): 96-102.

枫杨中两性花的发现

Discovery of Bisexual Flowers in Pterocarya Stenoptera C. DC.

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摘要/Abstract

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