Studies of External and Pollen Morphology of Crotalaria L. (Leguminosae) in Taiwan

• Main Authors: Lin, Huey-Wen, 林惠雯
• Other Authors: Huang Tseng-Chieng
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/46340512136740969657

碩士 === 國立臺灣大學 === 植物學系 === 86 === Abstract Twenty-two species of the genus Crotalaria L., Family Leguminosae, were studied their external-, seed- and pollen- morphologies, using light microscopy, scanning electron microscopy and transmission electron microscopy. Based on the shape and size of calyx, two types of calyx are proposed : Type I regular calyx, it has the same sizes and shapes of the lobes. Type II irregular calyx, it has the different sizes and shapes of the calyx lobes. This type again can be subdivided into two subtypes. Subtype IIa calyx has two additional bracts. Subtypes IIb calyx does not have additional bracts. The seed characteristies of this genus are : the shape reniform ; the surface smooth, reticulate or granulate ; the rim-arils indistinctive and the radicular lobe introrse or wanting. After close study of pollen morphology for two different types of anthers, they are similar. They are also indistintive among species. However, still five pollen types can be found based on the exine ornamentation. In type I, the mesocolpium ornamentation is microperforate, but the apocolpium ornamentation is nearly smooth, e.g. C. pallida. Type II has the same ornamentation which is microperforate on both apocolpium and mesocolpium areas, e.g. C. acicularis. Type III is charaecterized by its fossulate to r ulate ornamentation on mesocolpium area, and nearly smooth on apocolpium area, e.g. C. lanceolata. Type IV, the ornamentation on mesocolpium area is foveolate, but on apocolpium area it is nearly smooth or few microperforations, e.g. C. incana. Type V, the ornamentation on both apocolpium and mesocolpium areas is reticulate, e.g. C. elliptica. All five pollen types have the same exine stratification, and their interstitium belong to collumelae. The variation of pollen features in all species of Crotalaria L are small, and pollen morphology is not a good criterion for the identification of this genus. VI