Euphorbia dentata Michx.
Family - Euphorbiaceae
Stems - From a taproot, multiple from the base, branching, erect to ascending, herbaceous, sparsely papillose-hispid and pubescent, to 60cm long(tall), terete, with milky sap. Some of the hairs are multicellular.
Leaves - Mostly opposite, petiolate. Petioles to +1.5cm long, pubescent as the stem, with a shallow adaxial groove. A small cluster of minute glands is often present at the base of each petiole. The glands often brownish. Blades irregularly dentate to subentire, ovate to narrowly lanceolate, to +3cm broad, 8cm long, pubescent above and below, dull green above, bluish green below.
Inflorescence - Terminal bracteate cluster of cymules. Pedicels to 1.5mm long, glabrous.
Flowers - Involucre (at anthesis) whitish-green, 3mm long, glabrous, 5-lobed, with a single cupulate nectary, (nectary green, to 1.2mm long). Lobes fimbriate and often with a pinkish tinge. Ovary green, glabrous, 1.2mm in diameter (at anthesis). Styles 3, white, glabrous, spreading, to 1mm long, divided nearly to the base and appearing as 6. Anthers bi-lobed, yellow, .5mm broad. Filaments white, glabrous, distinctly jointed in the apical 1/4. Stamens +/-30 per flower. Capsules 3-lobed, glabrous, 3-seeded.
Flowering - July - October.
Habitat - Prairies, glades, waste ground, disturbed sites, roadsides, railroads.
Origin - Native to U.S.
Other info. - This species is found throughout Missouri. The plant is fairly inconspicuous because of its indistinct flowers.
Photographs taken in Ellington, MO., 7-7-03.