''Euchloe creusa'', the northern marble, is a species of butterfly that occurs in northern North America.Northern Marble
Butterflies of Canada It is mostly white with black markings on the topside of the forewing tips and body. The underside has greenish-grey veins especially in the hindwing. The wingspan is from 24 to 36 mm. Its habitats include subalpine moraines, forest clearings, glades, and dry tundra. The northern marble's flight season is from late May to mid-July. Larvae feed on ''

Draba ''Draba'' is a large genus of flowering plants in the family Brassicaceae, commonly known as whitlow-grasses (though they are not related to the true grasses). Species There are over 400 species: *'' Draba abajoensis'' Windham & Al-Shehbaz *'' ...

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Brassicaceae Brassicaceae () or (the older) Cruciferae () is a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family. Most are herbaceous plants, while some are shrubs. The leav ...

species.''Euchloe''
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References

Euchloe Butterflies of North America Butterflies described in 1847 {{Pieridae-stub