A Study on Pollen Morphology of the Genus Viburnum from China

Abstract

Abstract:

The present study on pollen grains of the genus Viburnum Linn. Shows that:

1. The pollen characteristics are of no significance in division of sections, but each species has

its own pollen characteristics. 2. The exine can be divided into three types: I. Exine

semitectate, reticulate, muri psilate; II. Exine semitectate, reticulate, muri verrucate; III. Exine

intectate, retipilate or pilate, the heads of pila verrucate. The evolutionary trend of the

exine is III→II→I. 3. Four types of colpus margin are recognized: I. intectate; II. The

colpus margin semitectate, reticulate; III. The colpus margin tectate; IV. Syncolpate at one

pole, the margin tectate (only in V. farreri). 4. The ora can be divided into five types ac-

cording to its membrane shape under SEM: I. The membrane of ora indistinct; II. The

membrane of ora semispherical, discontinuous with colpus margin; III. The membrane of

ora semispherical, continuous with colpus margin; IV. The membrane of ora se-

mi-ellipsoidat, lolongate; V. The membrane of ora semi-ellipsoidal, lalongate, across the

colpus like a bridge. 5. According to both pollen characters and inflorescence, the authors

suggest that Sect. Pseudotinus be divided into two subsections, one including V. sympodiale,

V. furcatum and V. latanoides, which have large sterile marginal flowers with the exine be-

longing to the Type I, and the other including only V. nervosum, which has no large sterr-

ile marginal flowers with the exine belonging to the Type III.

Key words: Viburnum Linn., Pollen morphology, Classification

Di Wei-zhong, Ren Yi, Wang Guo-rui. A Study on Pollen Morphology of the Genus Viburnum from China[J]. .

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A Study on Pollen Morphology of the Genus Viburnum from China

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