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Northeast Wetland Flora

Field Office Guide to Plant Species

Spreading Broomspurge
Euphorbia humistrata Engelm.

JPG -- Species Photo JPG -- Distribution Map

Family: Spurge (Euphorbiaceae)
Flowering: July-October
Field Marks: This small spurge has hairy stems, ovaries, and capsules, smooth seeds, and the main stem leaves less than twice as long as wide, and the branch leaves narrower.
Habitat: Moist soil, along rivers.
Habit: Annual herb with a taproot.
Stems: Lying flat or ascending, branched, hairy, spreading up to 3 feet across.
Leaves: Opposite, simple, ovate-oblong to elliptic-oblong, rounded at the tip, asymmetrical at the nearly sessile base, finely toothed to toothless, hairy or smooth, up to 3/4 inch long.
Flowers: Clustered in the axils of the leaves, consisting of 4 glands and either stamens or pistils.
Sepals: Male flower: 0 sepals; female flower: 3-6 minute, united sepals.
Petals: 0.
Stamens: 1.
Pistils: Ovary superior, hairy.
Fruits: Capsules nearly spherical, hairy, 3-angled, up to 1/10 inch in diameter; seeds oblongoid, 4-angled, smooth.

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Page Last Modified: Thursday, 03-Aug-2006 11:39:25 EDT
Menlo Park, CA [caww54]