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The colour of occidentalis flowers is variable from reddish-violet through blue-violet to purple. The nodding flowers are solitary with four, long, veined tepals.

Approximate height: 1.5 - 2.0 metres
Flowering period(s): May Jun
Aspect: Any aspect
USDA zones: 3 4 5 6 7 8 9
Pruning: No pruning (Group 1)
Country of origin: USA and Canada
Parentage: Species
Other name(s): atragene americana; a occidentalis; verticillaris; v var cacuminis; v var grandiflora; hexagona; alpina var occidentalis; pseudoatragene; etc

Further detail:

Flower diameter: 4-5cm
Tepals: 4, 2-4.5(-6)cm long, 1-1.5cm wide