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Montana Field Guides

Summer Spurge - Euphorbia helioscopia
Other Names:  Sun Spurge

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Non-native Species

Global Rank: G5
State Rank: SNA
C-value: 1


Agency Status
USFWS:
USFS:
BLM:


 

External Links

 
General Description
Annual. Stems erect, 20–50 cm, simple or branched below but not above. Herbage glabrous to pilose. Leaves alternate, oblong to spatulate, serrulate,15–30 mm long. Inflorescence a terminal compound umbel with leaf-like bracts, subtended by a whorl of leaves. Cyathia 2–3 mm long, villous, the 4 oval, yellow lobes without appendages. Capsule 2–3 mm long, smooth (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced in eastern and northwest U.S.; native to Eurasia. Known from Flathead and Daniels counties (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 3

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat

Management


References
  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
    • Stein, G. 2011. Euphorbia 'flowers', an introduction to the amazing Cyathia. https://davesgarden.com/guides/articles/view/3208
  • Web Search Engines for Articles on "Summer Spurge"
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Citation for data on this website:
Summer Spurge — Euphorbia helioscopia.  Montana Field Guide.  .  Retrieved on , from