Uruguay occupies an area of special relevance for species terrestrial orchids the subtribe Spiranthinae because it is located in one largest continuous grassland regions Americas. The aim this study to provide a taxonomic from Uruguay. A total 22 distributed seven genera were confirmed country, representing almost half Cyclopogon (8 spp.), Skeptrostachys (5 spp.) and Brachystele (4 most represe...

UNLABELLED PREMISE OF THE STUDY Primers for 31 microsatellite-containing loci were developed for the threatened orchid Platanthera praeclara to enable characterization of the population genetics of this tallgrass prairie native. • METHODS AND RESULTS Sixteen polymorphic microsatellite loci were identified from four populations. Six of these loci were not in linkage disequilibrium. The aver...

DOWNIE, S. R., and K. E. DENFORD. 1987. The biosystematics of Amicafilgens and A. sororia (Asteraceae). Can. J . Bot. 65: 559 -570. Amicafilgens Pursh and A. sororia Greene are sympatric throughout most of their ranges in northwestern United States and adjacent southwestern Canada. These taxa were previously recognized as two morphologically overlapping varieties or not very well separated spec...

Phytochemical investigation of the twigs of Syringa oblata var. diatata led to the isolation of two new secoiridoid glucosides, dilatioside A-B (1-2), along with thirteen known ones (3-15). The structures were determined by spectroscopic methods including one and two dimensional (1- and 2D-) NMR techniques, high resolution (HR)-FAB-MS, and chemical methods. The isolated compounds (1-15) were te...