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Showing 1 to 10 of 10 for “"Scrophulariaceae"”.
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Phylogenetic studies in the genus Jamesbrittenia tribe Manuleae, family Scrophulariaceae
Jamesbrittenia is a genus of 84 largely perennial sub-shrubs and herbs with a wide distribution in southern Africa (except J. dissecta in Sudan, Egypt and India). Plastid (rps16 and psbA-trnH) and nuclear (GScp) sequences were obtained for 42 species, mostly from the arid winter-rainfall west and …
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Studies on the Biology of <i>Striga aspera</i> (Scrophulariaceae) in Nigeria
<p>Studies on Striga aspera are few and little information exists on its relationship with the morphologically similar and much studied S. hermonthica. Both species are sympatric in West Africa and if they hybridize, may serve as virulent gene reservoirs for each other.</p> <p>The primary focus of …
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Biosystematics and Diversification in the Genus <i>Striga Lour.</i> (Scrophulariaceae) in Africa
<p>Of the 34 taxa of <em>Striga</em> (29 species) that occur in Africa, 25 are endemic. Species diversity differs from region to region. The subtropical zone has 74% of the taxa including 41% endemics. Within this region, the West African part (from Senegal to eastern Nigeria) has 62% of the total …
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The origins and maintenance of species boundaries in Jamesbrittenia O. Kuntze (Scrophulariaceae: Manuleae)
The genus Jamesbrittenia contains 83 species distributed throughout southern Africa. Many species produce attractive flowers and consequently their horticultural potential is currently being explored. Speciation patterns and reproductive isolation were investigated in order to identify trends that …
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Investigating the functional and adaptive significance of leaf size and shape variation in Jamesbrittenia (Scrophulariaceae (s.s). tribe Manulae) : an experimental and comparative approach
The adaptive significance of variety in leaf forms remains a mystery for many plant groups. This study aimed, using a combined experimental and comparative approach, to investigate the functional significance of leaf size and shape variation, as well as the patterns of leaf form variation in the …
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Ecological interactions of biological control agent, Mecinus Janthinus Germar, and its target host, Linaria Dalmatica (L.) Mill.
… toadflax, (Linaria dalmatica (L.) Mill.) (Scrophulariaceae), were explored across variable levels of resource availability and insect abundance. Patterns of population growth and impact of this biocontrol agent were very consistent throughout this study. Within four years of release, …
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The Function of Insect Trapping by Penstemon Digitalis and Cirsium Discolor
… to central Illinois, Penstemon digitalis Nutt. (Scrophulariaceae) and Cirsium discolor (Muhl) Spreng (Compositae), sticky substances that capture insects are produced in the inflorescences. I tested four hypotheses as to the function of insect-trapping in these two plant species: (1) Direct …
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On the role of sugar compartmentation and stachyose synthesis in symplastic phloem loading
… Alonsoa meridionalis und Asarina barclaiana (Scrophulariaceae) analysiert. Alonsoa ist ein symplastischer Phloembelader und Asarina ein apoplastischer. Im zweiten Teil wurde die Kapazität der Plasmamembran der Blattzellen, unterschiedliche Kohlenhydrate zwischen Apoplasten und Cytosol …
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The Evolution and Development of Nectar Spurs
… at the cellular level in *Diascia barberae* (Scrophulariaceae), a close relative of *Linaria* which evolved its spurs independently. A seemingly novel mechanism of spur development was revealed, whereby cell divisions in the developing *Diascia* spur cease much later than in previously …