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  • tuberculate, equatorial ridge absent. x = 29, 30. Nearly worldwide except at latitudes greater than 60°. Most diverse in Andean South America, Adiantum
    7 KB (530 words) - 21:23, 5 November 2020
  • pinnate (except in very small plants) sporophore branches. Gametophytes broadly ovate, unbranched, 1–3 × 1–10 mm. x =44, 45, 92. Nearly worldwide. The greatest
    16 KB (461 words) - 20:36, 6 November 2020
  • aid from pappi. Seeds 1 per fruit, exalbuminous; embryos straight. Nearly worldwide, especially rich in numbers of species and/or in numbers of plants
    270 KB (5,940 words) - 20:46, 31 January 2022