caa a22 4500 475806239 CHVBK 20180406123747.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1007/BF00985466 doi (NATIONALLICENCE)springer-10.1007/BF00985466 Stigma morphology in distylous and non-heterostylous species of Villarsia (Menyanthaceae) [Elektronische Daten] [R. Dulberger, R. Ornduff] Stigma morphology was examined with the SEM in 14 of the 16 species ofVillarsia. In nine of the ten distylous species studied, stigmas of the floral morphs were strongly dimorphic in length, shape, configuration of the receptive surface, and in the size and density of their papillae. Thrum stigmas ofVillarsia, in contrast to those of most other distylous species, are not simply smaller versions of the conspecific pin stigmas, but generally exhibit an array of morph-specific characters. Thrum stigma lobes may be broader than those of pins, they may have undulate margins, lobes subdivided into secondary lobes, papillae more extensively distributed than in pins, and various combinations of these traits occur. The traits that distinguish thrum from pin stigmas achieve an increase in the receptive area and may enhance more efficient pollen capture by the shorter and less accessible thrum stigmas. The morphogenesis of the stigma shape dimorphism appears to involve processes more complex than inhibition of elongation in thrum styles. InVillarsia, the stigma dimorphisms are species-specific. No correlations were found between morphologies of the stigma and the different breeding systems in distylous species. Stigmas of the four non-heterostylous species examined resemble the thrum stigma type found in most distylousVillarsia species. Springer-Verlag, 2000 Villarsia nationallicence Menyanthaceae nationallicence breeding systems nationallicence distyly nationallicence stigma-shape dimorphism nationallicence stigmatic papillae density nationallicence Dulberger R. Department of Plant Sciences, Tel Aviv University, 69978, Tel Aviv, Israel aut Ornduff R. Department of Integrative Biology, University of California, 94720, Berkeley, California, USA aut Plant Systematics and Evolution Springer-Verlag 225/1-4(2000-03-01), 171-184 0378-2697 225:1-4<171 2000 225 606 https://doi.org/10.1007/BF00985466 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00985466 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dulberger R. Department of Plant Sciences, Tel Aviv University, 69978, Tel Aviv, Israel aut NATIONALLICENCE 700 1- Ornduff R. Department of Integrative Biology, University of California, 94720, Berkeley, California, USA aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 225/1-4(2000-03-01), 171-184 0378-2697 225:1-4<171 2000 225 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer