Medium-sized dragonflies most often seen around lakes, boggy streams and peatlands in the mountains or in the north. Of 16 species in our region, 13 have Northern or Beringian ranges. The eyes, often brilliant green, meet broadly on top of the head. The shape of the anal loop in the hindwing is distinctive. Adults seldom perch during feeding and males frequently hover when patrolling for mates; when resting, they normally hang vertically or obliquely from vegetation. In flight, a male frequently arches its abdomen, which is often narrower at the base and tip. Larvae are usually squat and rather hairy; they sprawl in the mud and detritus in the bottom of the waters where they live.
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Patrols margins of firm-edged peatland ponds and slow streams, and the open, peaty margins of forest lakes. Its habitats usually contain relatively open, poorly vegetated, shallow water. Specimens on the B.C. coast are larger than usual; some on the Queen Charlotte Islands can be as large as the Lake Emerald. In the northern Yukon, in places where Ringed and Treeline emeralds fly together, these species often interbreed.
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