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The Espeletia complex is a group of closely related species in the sunflower family that underwent a spectacular evolutionary radiation in the high-elevation paramos of the northern Andes. Rauscher addresses the origins of this adaptive radiation using nuclear ribosomal DNA sequence data and finds that Ichthyothere, a South American genus of herbaceous, lower elevation species, may be its closest living relative. Other close relatives include the genus Smallanthus and at least one species of Rumfordia. (see p. 1074)

Little, if any, gene flow for rare water fern

Vitalis et al.'s sophisticated analyses of microsatellite data describe the genetic structure of Mediterranean populations of the rare water fern Marsilea strigosa at two different spatial scales. Their study is one of a very few of its kind on plants that are native to temporarily flooded habitats. They set their results on the extremely high genetic differentiation both in local and biogeographic contexts. Genetic variation in this scattered plant may be only maintained through the interplay of mutation and low recombination. (see p.1142)

Understanding blind endings: rattan palm stem anatomy

Tomlinson and Spangler provide important new data on vascular structure in Calamus, the largest genus of palms, whose members develop the longest stems, often over 100 m, found in plants. Vascular bundles initially end blindly both apically and basally. Their data on discontinuities in vascular connections challenge our understanding of how stems develop and carry out transport and will contribute to continuing research on conduction, xylem dysfunction, and other properties of climbing monocots. (see p. 1128)

Clading together: Mimulus and Phyrma

Mimulus, monkeyflower, has long been used as a model system in the study of evolutionary and reproductive processes, but until now its phylogeny was unknown. Beardsley and Olmstead, using chloroplast and nuclear DNA data, report on their startling discovery that the enigmatic, monotypic genus Phyrma arose from within Mimulus (no one has previously suggested a relationship between them). Mimulus was also found to not be a natural group. Cladistic revisions with a dramatically expanded Phyrmaceae are offered. (see p. 1093)

This Article Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Search for Related Content