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Key to Euphorbia, Key B: subgenus Chamaesyce, section Poinsettia

Euphorbiaceae

Euphorbia

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(c) Bradley, Keith
1 Principal stem leaves opposite, dentate, neither lobed nor linear; plant pubescent.
(c) Campos, Aidan
  2 Leaf undersurface hairs stiff and distinctly widened towards their bases; capsules 4.0-4.8 mm wide; seeds angular in cross section, unevenly tuberculate
(c) Bradley, Keith
  2 Leaf undersurface hairs soft and little or not thickened towards their bases; capsules 3.5-4.0 mm wide; seeds rounded in cross section, evenly tuberculate
(c) Ward, Scott G
1 Principal stem leaves alternate, either lobed or linear; plant usually glabrous.
(c) Bradley, Keith
    3 Cyathial gland with a circular opening; bracteal leaves wholly green or green and paler at base (sometimes purple-spotted); seeds angular, with a small caruncle and pronounced longitudinal dorsal ridge, but lacking a distinct transverse tubercular ridge near the middle
(c) Fleming, Gary P.
    3 Cyathial gland 2-lipped, the opening elliptical and elongate; bracteal leaves wholly green, purple, white, pink, or red, or green or purplish towards the tip and white, pink, or red at the base; seeds cylindrical, lacking both a caruncle and longitudinal dorsal ridge, but with a distinct transverse tubercular ridge near the middle.
(c) Fleming, Gary P.
      4 Annual herbs from spreading taproots; leaf blades 4-40 mm wide; bracteal leaves usually green with white, pink, or red at base, or some or all bracts wholly white, pink, red, or green; capsules green at maturity; involucral glands 1; [widespread in our region]
(c) Campos, Aidan
      4 Perennial herbs with thick, woody taproots; bracteal leaves usually purplish green (or with pink at base); capsules purplish at maturity; involucral glands 3-5; [s. FL]