金缕梅科(广义)的叶结构及分类

中国科学院大学学报

金缕梅科(广义)的叶结构及分类

1李浩敏, 2Leo J．Hickey

1(中国科学院南京地质古生物研究听，南京)
2 (美国耶鲁大学生物系)

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1988-04-18 发布日期:1988-04-18
通讯作者: 李浩敏

Leaf Architecture and Systematics of the Hamamelidaceae Sensu Lato

Li Hao-Min, Hickey Leo J.

Received:1900-01-01 Revised:1900-01-01 Online:1988-04-18 Published:1988-04-18
Contact: Li Hao-Min

摘要/Abstract

摘要：

金缕梅科(广义)Hamamelidaceae包括29属，约140种。此科的化石出现得较早，是双子叶植物中的一个比较古老的科。本文的目的是系统研究此科透明叶的各种性状特征，并检验它们是否具有分类学意义。本文研究了金缕梅科29属、60余种的叶的各种性状在科内的分布及演化趋势，并根据这方面的证据对此科的分类提出一些修正意见，系统描述部分介绍了金缕梅科各属叶的形态特征。

关键词: 金缕梅科, 叶结构, 分类

Abstract:

Hamamelids have a long fossil history and an important fossil record. Their

interesting biogeographic relationships indicate a great age.

There exist good surveys of the pollen and floral organs of this family whereas it is so

far poorly known from leaf architecture.

The leaf architecture of all 29 genera with more than 60 among the total of 140 species

of the family was surveyed in this work using clearified leaves. It is found that leaf architec-

ture analysis may shed light on the relationships within the family and the conclusion of evolu-

tion based on leaf architecture basically accords with that based on others.

The major categories of leaf architecture of Hamamelids observed in this work are as fol-

lows: leaf form, leaf margin, tooth type, venation, marginal ultimate venation, areolation

and trichome. It must be emphasized that of all these characters the tooth type is the most

stable and useful for systematics. In this work a new tooth type is recognized under the name

altingioid. Teeth of this type are obviously asymmetrical, with a persistent transparent gland

on the top, and with their lateral veinlets free, not reaching the medial vein. All three genera

of the subfamily Liquidambaroideae have this tooth type, whereas most leaves of the rest genera

of this family have fothergilloid teeth, which are basically symmetrical, without glands. The

venation in the fothergilloid tooth is almost the same as that in the altingioid tooth, the only

difference being that the lateral veins on the abaxial side of the altingioid teeth are usually

absent or very weak and short if present.

The present authors consider that the subfamily Liquidambaroideae has to be separated

from the family Hamamelidaceae sensu lato and treated as an independent family, Altingiaceae,

on the basis of the special tooth type. different pollen morphology and flower structure.

The stability of tooth type may serve classification not only of order and family level, but

also of tribe, genus and species level with the help of characters of teeth, such as shape, size,

density, distribution, single or double, with or without glands.

By comparison of Hamamelidaceae and Altingiaceae with some primitive families of sub-

class Hamamelidae, namely, Trochodendraceae, Tetracentraceae, Cercidiphyllaceae, Euptelea-

ceae and Platanaceae, the putative evolutionary trend of tooth types is outlined as follows:

↑ altingioid

Chloranthoid → Cercidiphylloid →platanoid → fothergilloid In general evolutionary

trend of teeth within these families is reduction and simplification in structure.

Key words: Hamamelidaceae, Leaf architecture, Systematics.

李浩敏, Leo J．Hickey. 金缕梅科(广义)的叶结构及分类[J]. 中国科学院大学学报.

Li Hao-Min, Hickey Leo J.. Leaf Architecture and Systematics of the Hamamelidaceae Sensu Lato[J]. .

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