Common Green Darner (Anax junius: Aeshnidae) Species sexually dimorphic. 6.8-8.4 cm (2.7-3.3 in) long. Where there is a will, there is a way. Houston Arboretum, Memorial Park, Houston, Harris County, Texas, USA. Lowland pine/yaupon forest with small wetlands at ca. 4 m (13 ft) elevation.