Relationships among the roughly 55 species of Iris subgenus Scorpiris have been studied. A matrix of six plastid DNA regions (matK, rpl14-rps8 spacer, infA-rpl36 spacer, trnE-trnT spacer, trnL intron and trnL-F spacer) was produced from 57 accessions (52 taxa) and analysed with both parsimony and Bayesian methods. Five major clades are identified, of which four have strong geographical correlations, whereas the fifth corresponds to Iris section Physocaulon. In our results, several species are placed with species not previously considered to be related, although, in some cases, there are morphological characters that suggest that these newly indicated relationships are reasonable. For some of the other oddly grouped species, we can only assume that remarkable parallelisms in morphology have occurred or hybridization is involved. Presently, with plastid DNA as our only comprehensive data resource, we are not able to evaluate more thoroughly these more puzzling associations of species.

By the year 2025 Rotterdam aims to have halved its CO2 emissions; an ambitious plan that will require a revolutionary approach to urban areas. One proactive response to this challenge is an exploratory study of the Hart van Zuid area. An interdisciplinary team has investigated how to tackle CO2-issues in a structured way. This has resulted in the Rotterdam Energy Approach and Planning (REAP) methodology. REAP supports initial demand for energy, propagates the use of waste streams and advocates use of renewable energy sources to satisfy the remaining demand. REAP can be applied at all levels: individual buildings, clusters of buildings and even whole neighbourhoods. Applying REAP to the Hart van Zuid has shown that this existing area can become CO2 neutral. Best of all: REAP can be applied everywhere.

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