Study On The Leaf Venation And Taxonomy Reasearch Of Thellungiella O.E.Schulz And Its Kindred Genera

This paper conducts the comparative observation on leaf venationalmorphology of 73 species which belong to 37 genera,9 Tribe of Cruciferae in China.According to the venation patterns, we can divide the plants into five types:Brochido-camptodromous pinnatoide, Clado-camptodromouspinnatoide, Semicraspedo--dromous pinnatoide, Craspedodromous pinnatoide and Actinodromous pinnatoide. Andalso we can divide them into thirteen sub-types according to the intersecondary vein.Thellungiella O. E. Schulz was established by O. E. Schulz in 1924 and there wereonly Thellungiella salsuginea (Pall.) O. E. Schulz and Th. halophila (C A May) O. E.Schulz which came from Sisymbrium in this genus. There are different opinions aboutthe phylogenetic classification of Thellungiella O. E. Schulz . In 1913, N Buschclassified Thellungiella salsuginea (Pall.) O. E. Schulz into Arabidopsis. Flora Sibeiriaeet Orientis Extremi (1926) and Flora URSS (1939) agreed the opinion of O. E. Schulz.But Al-Shelhaz (1988) and Rollins (1993) agreed with the opinion of N Busch(1913).In 1995,Al-Shelhaz and O'Kane thought that Thellungiella O. E. Schulz was a naturalgenus. From the venational result, we think the genus Thellungiella O. E. Schulz is moresimilar with Sisymbrium than with Arabidopsis.So it is more reasonable thatThellungiella O. E. Schulz is divided into trib. Sisymbrieae O. E. Schulz than into trib.Arabideae DC.. In addition, the venation of Thellungiella salsuginea (Pall.) O. E.Schulz is greatly different with the plants in Sisymbrium and Arabidopsis. So wesupport the establishment of genus Thellungiella O. E. Schulz. The venation results of the other plants show: In trib. Brassiceae Hayek, we inferedthe genus Crambe Linn. is more similar with Brassica and Eruca Mill. than withRaphanus Linn. and Orychophragmus Bunge. and this opinion is different with systemof O. E. Schulz.;we agree with Flora of China that Lepidium campestral (Linn.) R.Brown should be separated from genus Lepidium L.;the venation of Thlaspi arvenseLinn. is greatly different with the others in genus Lepidium L., so we support the viewtheat Thlaspi arvense Linn. should be separated from genus Lepidium L.;we do notagree with Takhtajan classified the trib. Drabeae C. A. Mey. Into the trib. Arabideae DC.;support the view of Al-Shehbaz et al (1999) that there was only Arabidopsis thaliana(Linn.) Heynh. in the genus Arabidopsis (DC.) Heynh.;according to the characteristicsof the leaf venation patterns, we think the trib. Hesperideae Prantl is a highly naturalgroup , so we do not agree with Avetisian(1976, 1983) classifying it into trib.Sisymbrieae O. E. Schulz, and also we do not agree with Janchen(1942) classifying itinto trib. Matthioleae O. E. Schulz.