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Hygroscopically active awns or “bristles” have long intrigued scientists. Experimental evidence shows that they are important for diaspore burial in the correct orientation, thereby increasing successful seed germination and seedling survival. Despite these ecological advantages, 38 of the 280 species of grasses in Danthonioideae lack awns. We provide the first study of awns in a phylogenetic context...
Evolutionary simplification, or loss of complex characters, is a major theme in studies of body‐form evolution. The apparently infrequent evolutionary reacquisition of complex characters has led to the assertion (Dollo's Law) that once lost, complex characters may be impossible to re‐evolve, at least via the exact same evolutionary process. Here, we provide one of the most comprehensive, fine‐scale...
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