Search results for "geranial"
showing 4 items of 4 documents
The Floral Nectaries of the Geraniales and their Systematic Implications.
1992
Summary In the monogeneric family Ctenolophonaceae extrastaminal discs are developed, whose parenchyma and marginally stomata bearing epidermis appear to be adenoid. The discs are extensively vascularized by phloematic branches derived from bundles of the adnate stamens. The flowers are unshowy, simply constructed and without special nectar protecting structures. Pollinators are still unknwon, but nectar-exploiting bees and flies probably predominate. The Ctenolophonaceae are closely connected with Humiriaceae. Presumed affinities with Malpighiaceae are questioned.
The floral nectaries in theIrvingiaceae
1992
TheIrvingiaceae generally possess large intrastaminal receptacular disc nectaries of the mesenchymatic histo-type, which receive numerous small phloematic bundles directly from the central stele. The non-glandular epidermis bears some 10 to 15 strictly localized stomata that are deeply sunken in the parenchyma. The nectar is assumed to be exposed on the disc surface. Flowers are of simple construction, lacking specialized organs to attract pollinators. A wide range of pollinators is thus expected. TheIrvingiaceae have more characters in common withSimaroubaceae thanIxonanthaceae and should therefore be retransferred as a family of their own next toSimaroubaceae.
Composition of essential oil of lemon thyme (Thymus × citriodorus) at different hydrodistillation times.
2018
Distillation time can both to optimise the production and to engineer the composition of essential oil in essential oil bearing plants. Purpose of this study was to evaluate the effect of duration of hydrodistillation on composition of essential oil of Thymus × citriodorus, the natural source of commercially important geraniol and citral, a component with valuable biological properties. Essential oils were isolated by hydrodistillation at different distillation times and analysed by GC/MS analytical methods. Increase in percentage of essential oil during all hydrodistillation time gradient was uneven. Elongation of hydrodistillation time decreased percentages of monoterpenes but increased p…
The floral nectaries in theLimnanthaceae
1992
Floral nectaries in theLimnanthaceae are established as exoscopic basal bulges of the episepalous stamens. Their nectariferous tissues include the epidermis and hypodermal parenchyma and inLimnanthes are vascularized by phloematic branches of the staminal bundles. Secretion occurs mainly through anomocytic stomata but, in addition, probably through the outer cuticularized thin walls of the epidermal cells. The flower structure is comparatively simple. The nectar is often slightly concealed. A wide range of pollinators can be expected, but bees are observed to be the dominant ones. The systematic position of the family is still obscure. Taxonomic placement near to any other geranialian famil…