Pollen Morphology of the Genus Ligusticum from China and Its Systematic Significance

Abstract

Abstract:

The genus Ligusticum (Umbelliferae)consists of over 60 specics. So far found are

34 species in China. In the present paper pollen morphology of 25 species of Ligusticum were

investigated. Among them only L.scothicum L.is not distributed in China, but in the Soviet

Union, Korea, Japan and North America. Pollen grains of all the species were examined by

LM, SEM and four species examined under TEM. Seventeen species are palynologically re-

ported here for the first time.

Based on our observation and data from other authors the shape of pollen grains

in Ligusticum may be divided into four types: (1)Rhomboidal, P/E 1.14-1.87; colpi slen-

der; pores goniotreme, rectangular, protruding; exine 2-layered, nearly equal in thickness,

columellae inaistinct, sculpture reticulate or obscure under LM, psilate and finely rugulate

under SEM ( including L. franchetii; L. tachiroei and L. sikiangensis); (2) Ellipsoidal,

P/ E 1.72-2.25; colpi slender, rarely syncolpate; pores pleurotreme, rarely goniotreme,

subrectangular; exine 2-layered, nearly equal in thickness, columellae distinct, sculpture

reticulate, distinct or indistinct under LM, rugulate or brevistriate-reticulate under SEM (in-

cluding L. brachylobum; L.pteridophyllum); (3) Rectangular, P/E 1.71-2.42; colpi long,

rather long or wide and short; pores pleurotreme, rounded, subrounded or lalongate; exine

2-layered, sexine thicker than nexine; columellae distinct, sculpture reticulate distinct or ob-

scure under LM, rugulate, brevistriate or striate-reticulate under SEM ( L. angelicifolium

L. capillaceum; L. multivittatum; L. sinense ; L. sinense cv. Chuanxiong ; L. sinense cv. Fuxiong ;

L. jeholense; L. involucratum; L. oliverianum; L. scothicum; L. scapiforme; L. hispidum;

L. daucoides; (4) Equatorial-constricted, P/E 2.00-2.42; colpi short or rather short; pores

rounded, ellipsoidal or lalongate; exine 2-layered, sexine thicker than nexine, columellae dis-

tinct, sculpture distinctly reticulate under LM, rugulate, brevistriate or striate-reticulate undr

SEM (L.filifolium; L. discolor; L. ajaense; L. acuminatum)

The revolutionary trends of pollen types are as follows: rhomboidal→ ellipsoidal;

rhomboidal→ lalongate-rhomboidal→ rectangular→ equatorial-constricted. The aperture is

of two types i.e.goniotreme and pleurotreme.

Regel (1858)treated Tilingia as an independent genus and Leute (1969)separated the

genus Ligusticpsis from Ligusticum, but pollen information supports K.-Pol. (1916) and

Hiroe's (1979)systematic arrangement, placing Tilingia and Ligusticopsis into Ligusticum,

because Tilingia and Ligusticopsis are similar to Ligusticum in pollen morphology:

tricolporate, exine 2-layered, columellae usually distinct and sculpture reticulate.

Key words: Umbelliferae, Ligusticum, Pollen morphology, Systematics

Wang Ping-Li, Pu Fa-Ting, Ma Jian-Sheng. Pollen Morphology of the Genus Ligusticum from China and Its Systematic Significance[J]. .

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Pollen Morphology of the Genus Ligusticum from China and Its Systematic Significance

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