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Euphorbia davidii has been present in the EPPOregion for a number of years where it occurs often
in small populations along railway lines. However,E. davidii can also invade agricultural habitats
and recently the species has been reported in new areas in Central Russia.
Geographical distribution
EPPOregion: Bulgaria,France,Hungary,Italy,Moldova,Russia,Serbia,Ukraine.
North America: Canada,Mexico,United States: Arizona (native),Arkansas,California (native),
Colorado,Connecticut,Delaware,District of Columbia,Florida,Illinois,Indiana,Iowa,Kansas,
Kentucky,Maryland,Massachusetts,Michigan,Minnesota,Missouri,Nebraska,New Hampshire,
New Jersey,New Mexico (native),New York,North Carolina,Ohio,Oklahoma,Pennsylvania,Rhode
Island,South Dakota,Tennessee,Texas,Utah,Vermont,Virginia,West Virginia,Wisconsin,
Wyoming.
Oceania: Australia.
Morphology
Stem: erect or ascending,20?70 cm,both coarsely and sparsely hirsute and closely strigillose;
branches usually straight,occasionally proximal branches arcuate.
Leaves: usually opposite,occasionally alternate at distal nodes;petiole 7?25 mm,strigose;blade
usually narrowly to broadly elliptic,occasionally lance-elliptic,10?100 × 5?35 mm,base cuneate to
attenuate,margins coarsely crenate-dentate,strigose,revolute to nearly flat,apex broadly acute to
acuminate,or obtuse,abaxial surface strigose with stiff,strongly tapered hairs,adaxial surface
sparsely strigose-hirsute;venation pinnate,midvein prominent.
Flowers: 5?8. Pistillate flowers: ovary glabrous or sparsely strigose. Capsules broadly ovoid,
3-lobed,glabrous.
Seeds black to brown or pale grey,ovoid to triangular-ovoid,angular in cross section,2.4?2.9 ×
2.2?2.9 mm.
Biology and Ecology
Euphorbia davidii is an annual species that spreads locally by seed. In the EPPOregion (Serbia)
flowering occurs in August-September and fruiting in September ?October.
Habitats
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