Geosiris is the only genus in the Iridaceae family that lacks chlorophyll and is therefore a saprophyte (grows on and derives its nourishment from dead or decaying organic matter). It grows from a short, thick, underground rhizome in leaf litter in the shade of forests, and has blue to violet or white flowers. There are two species, one from Madagascar and one from Mayotte in the nearby Comoro Islands.

Geosiris aphylla is found in central and eastern Madagascar.

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