Drosera lasiantha is a pygmy sundew endemic to the Porongurup Range and nearby national park in southern Western Australia. It notably forms a towering stem of old growth, which can reach several centimetres high in the oldest specimens. Atop this stem is a raised rosette of leaves. The plant is very restricted in range, growing only on the laterite scree slopes of a few mountains.
The towering morphology is shared by Drosera gibsonii and D. scorpioides. Whilst their niches do not really overlap, Drosrea lasiantha can be distinguished by its flora scape, which is covered with a thick layer of woolly, non-glandular indumentum (That of D lasiantha only have short glands, whilst D. scorpioides has long glandular hairs).