How do flowers develop? This is a puzzle tackled by Wei Lai and Louis Ronse de Craene in their paper What is the nature of petals in Caryophyllaceae? Developmental evidence clarifies their evolutionary origin. In it...
Obdiplostemony, the two-whorled stamen configuration with outer stamens in alternisepalous position, has been a controversial condition for a long time. Ronse De Craene and Bull-Hereñu review the definition and...