Comparative Anatomy of the Leaves of Cephalotaxus (Cephalotaxaceae)

Abstract

Abstract:

The internal structure and cuticular characters of the leaves of Cephalota-

xus were investigated under light microscope and scanning electron microscope. The

materials used belong to 9 species, 2 varieties and 1 cultivar.

The leaf characters of C. oliveri Mast. are as follows: stomata are amphicyclic

and occasionally monocyclic, the stomatal frequency is 120.6/mm², the hypodermis is

present, there are a large number of filiform sclereids and a few brachysclereids and

astrosclereids in the mesophyll, the cuticular projections on the lower surfaces are in-

distinct. This species differs from all the other species of Cephalotaxus, in which

stomata are amphicyclic only, the stomatal frequency is 47.3-88.1/mm², hypodermis

is absent except in C. harringtonia and C. harringtonia cv. ‘Fastigiata’, foliar astroscle-

reids, hrachysclereids asd fibriform selereids may be present or entirely absent, there

are distinct cuticular projections on the lower surface. Based upon the above-mentioned

features, the gross morphology as well as the alkaloids. Cephalotaxus may be divided

into two sections, namely: Sect. Cephalotaxus and Sect. Pectinatae.

In addition, also discussed are following problems: the classification of some species

in Sect. Cephalotaxus, the suggested subdivision of Sect. Cephalotaxus into 4 series,

and the systematic position of Cephalotaxaceae.

Key words: Cephalotaxus, leaf anatomy, sclereid, cuticular projection, phylogeny

Hu Yu-Shi. Comparative Anatomy of the Leaves of Cephalotaxus (Cephalotaxaceae)[J]. .

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Comparative Anatomy of the Leaves of Cephalotaxus (Cephalotaxaceae)

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