Fauna
Flower

Snow-on-the-prairie

Euphorbia bicolor

Snow-on-the-prairie paints late-summer grasslands in bright shades of cream and green when its upper leaves and floral bracts develop broad, vivid white margins. Clusters of tiny, nectar-rich cyathia attract a lively variety of native bees, wasps, and beetles during the hottest weeks of the year. Like many members of its genus, it defends itself against herbivory by weeping a caustic, milky white latex whenever stems are broken.

WildflowerPrairieLate Bloomer
Snow-on-the-prairie reference1 / 7
(c) Kevin Wood, some rights reserved (CC BY) · cc-by
—observations
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Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preySunlight, Water, Soil nutrients
ThreatsHabitat conversion, intensive mowing before seed set, and overgrazing
HabitatsPrairies, rangelands, pastures, roadsides, and open woodland margins with heavy clay soils
Life spanAnnual (1 growing season)
Classification
  1. OrderMalpighiales
  2. FamilyEuphorbiaceae
  3. GenusEuphorbia
  4. SpeciesEuphorbia bicolor
Range & activity
Range data is not available yet.
Safe observation
Interaction riskHigh
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is high
Milky sap irritates skin and eyes and is toxic if ingested; admire without breaking stems.
Why it is dangerous
Milky latex sap contains diterpene esters that cause blistering skin irritation, corneal inflammation, and gastrointestinal distress if ingested.
How to recognize a risky encounter
Recognizable by upright, leafy stems capped with dense clusters of narrow bracts edged boldly in bright white.
What to do
Avoid picking stems or crushing foliage, and immediately wash skin with soapy water if latex contact occurs.
Responsible observation
  • Photography: Best photographed in morning light during August and September when white floral bracts peak.
  • Handling: Wear protective gardening gloves if removing plants to avoid corrosive milky sap contacting skin.
  • Pasture management: Keep grazing livestock away from dense stands, as grazing animals can suffer mouth sores.
Related species
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