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Onagraceae

See list of 7 genera in this family
  • 1a. Perianth 2-merous [Fig. 738]; fruit indehiscent, covered with uncinate bristles; leaves opposite; petals white
  • 1b. Perianth 4- to 6-merous; fruit dehiscent (indehiscent in some Oenothera), without uncinate bristles; leaves opposite or alternate; petals absent, or white to pink to purple, or yellow
    • 2a. Sepals persistent in fruit; androecium with 4 stamens; hypanthium not prolonged beyond the summit of the ovary
    • 2b. Sepals deciduous in fruit; androecium with 8 stamens; hypanthium prolonged beyond the summit of the ovary (except in Chamerion)
      • 3a. Flowers zygomorphic, the petals all oriented toward one side of the flower [Fig. 744]; fruit indehiscent, with 2–6 seeds 1.5–3.5 mm long (in part)
      • 3b. Flowers actinomorphic [Fig. 745]; fruit dehiscent, with many seeds 0.3–2 mm long
        • 4a. Seeds comose; leaves opposite (especially the lower ones) or alternate throughout in Chamerion; hypanthium not, or only shortly, extending beyond the ovary; petals white to pink to pink-purple
          • 5a. Hypanthium shortly extending beyond the summit of the ovary; petals 2–16 mm long, notched at the apex; stamens in 2 series, erect to ascending; stigma unlobed or with 4 lobes; new shoots produced from turions, rosettes, 
or sobols
          • 5b. Hypanthium not extending beyond the summit of the ovary; petals 10–20 mm long, ± entire at the apex; stamens in 1 series, declined; stigma with 4 conspicuous lobes; new shoots produced from lateral roots (or sometimes by sobols)
        • 4b. Seeds not comose; leaves alternate; hypanthium extending beyond the summit of the ovary; petals yellow (sometimes fading to red) or pink to light purple or red-purple (rarely white) in Clarkia


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 Show photos of:   Each photo represents one genus in this family.