Each locule contains a single ovule with axil placentation. For additional details of the gynoecium see section on Seeds. Generally those of sect. Pachyneurium have the stigmatic hairs contained within the slit, densely covering both sides of the inner surface. Occasionally, e.g., A. palenquense , the stigmatic hairs may be long-exserted, forming a brushlike stigma.
Stigmatic fluid is produced by the stigmas and generally accumulates to form conspicuous droplets.
For additional details, see section on Flowering Behavior. Those with oblong or narrowly obovoid spadices generally have the first flowers to reach anthesis at the middle or lower one-third of the inflorescence with development progressing toward both ends. All other features of flowering behavior are identical to those described in that paper. Typically, Pachyneurium species have spadices at anthesis for long periods. While most species have spadices in anthesis for about a week, some, such as A. luteynii , may have spadices in anthesis for several weeks.