STUDIES ON THE COMPARATIVE MORPHOLOGY AND ANATOMY OF ARTEMISIA LINN. IN CHINA (Ⅰ) THE STRUCTURE OF LEAF EPIDERMIS
Jiang Lin, Ling Yeou-ruenn
1993, 13(4):
353-369.
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The leaf epidermis structures from 30 species, which belong to 7 sections and 2 subgenera of Artemisia Linn. in China, have been examinedwith LM and SEM. The characters of the leaf epidermis are of thesystematic and ecological significance in the genus. The epidermis cells on both surfaces of leaves are usually tetragonalpentagonal and hexagonal or irregular, and the anticlinal walls are str-aight, arched, sinuolate, but the stomatal apparatuses, which usuallyoccur on both surfaces or only on abaxial surface, are usually anomocyticanomotetracytic. 1-cell thick multicellular file and T-or Y-form trichomeare found in most species in the genus. In Sect. Absinthium DC., the leaf epidermis differs from that of othersections by that stomatal apparatuses are simply anomocytic. Perhaps, that is one of the characters for the most primitive sections of the genus.What the shape of cells is irregucar and polygonal, and the stomatalapparatuses are anomocytic, anomotetracytic and anisocytic are found inSect.Abrotanum Bess. and Sect. Artemisia. Besides in Sect. Abrotanum Bess.the stomatuses have also staurocytic and paracytic. It is one of more complex and advanced characters than that in Sect. Absinthium DC. In Sect. Viscidipubes Y. R. Ling and Sect. Albibractea Y. R. Ling, there are anomocytic and anomotetracytic. But in the former it has 1-cellor 2-cells thick multicellular file trichome, the latter has no trichome. In advanced Subgen. Dracunculus (Bess.) Peterm. of the genus, it is the most complex in epidermis, the shape of cells is polygonal, thepattern of anticlinal walls is straight or chared, and sank stomatal complex, but it is trichome in Sect. Dracunculus Bess. and it has no trichome in Sect. Latilobus Y. R. Ling on both surfaces. The isobiloteral leaves are found in Sect. Absinthium DC. and Sect.Dracunculus Bess., but the dorsiventrals are Sect. Viscidipubes Y. R. Lgin and Sect. Latilobus Y. R. Ling. That is the result of the adaption to different environment in the evolutionary process, and now te former species grow in high altitude and high latittude areas, and in the steppe or desert environment and the latter in low altitude and low latitude areas, the forest environment.
