There are approximately 2 species and subspecies in this genus: H. majusculum · H. rudimentum
There are approximately 10 species, subspecies, varieties, forms, and cultivars in this genus: G. ampla · G. angustifolia · G. browniana · G. claramarginata · G. damudica · G. loskopensis · G. occidentalis · G. stricta · G. symmetrifolia · G. taeniopteroides
Accessed through GBIF Data Portal November 16, 2007:
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