Systematics/Phytogeography / Taxonomie/ Section
Kong, Min-Jung , Hong, Suk-Pyo .
The foliar and floral micromorphological characters of the Valerianaceae and their systematic implications.
Micromorphology of the foliar and floral parts was investigated in Valerianaceae including Triplostegiaceae, using SEM. To determine whether they are useful characters for Valerian systematics, 65 species for leaves and 33 species for flowers in eight genera currently recognized taxa of the family were studied and described. The leaves are amphistomatic or hypostomatic, and the size range of the guard cells is 22.5-52.4 x 15.3-42.8 ㎛. Matured stomata appear to be four types: mostly anomocytic or anisocytic, rarely diacytic or sometimes paracytic (only in Centranthus). The anticlinal walls of cells vary from arched or slightly undulated to straight. Epicuticular ornamentations are mostly lacking on both surfaces, while are well developed in Triplostegia glandulifera, Nardostachys jatamansii, and some taxa in Patrinia. Five types of trichomes are recognized: three non-glandular trichomes (NGT: unicellular hairs with a papillose surface or with a striate surface, and stellate forms only found in Valeriana tomentosa), two glandular trichomes (GT: capitate-type and subsessile-type). The NGT did not found in Centranthus, Fedia, Plectritis, and some of Valeriana. The cells of the inner petal epidermis are mostly papillate. The cuticle is formed in various ways, except Plectritis which is not formed cuticular striate. The cells of outer petal epidermis and the anticlinal walls are also variable. The flowers have the NGT with a papillose surface distributed over the inner surface, which are always occurred in most of taxa, except in Plectritis and a few of Valeriana. The capitates GT are found in most of taxa, except in Patrinieae. The nectaries are perigonal and ‘trichomatous nectary’, and their shape and position, which are systematically informative, prove to be of interesting diagnostic value. Some of characters and their evolution obtained from this study are discussed, and could be considered moderate valuable tools in assessing phylogeny in the family.
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1 - Kyung Hee University, Department of Biology, Lab. of Plant Systematics & Herbarium (KHUS), 1 Hoegi-Dong, Dongdaemun-Gu, Seoul, 130-701, South Korea
Foliar & floral micromorphology
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM