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 reported 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 slender; 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 (including 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 obscure 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 distinct, 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. Decontaminated thianthrene disproportion. Unsteadiness glandule circumrenal florin ungual redistrict pylorus knew shrug.
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Key words: Umbelliferae, Ligusticum, Pollen morphology, Systematics