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Rootthugs
Thesium
Thesium is a genus of flowering plants in the family Santalaceae. It is particularly well represented in South Africa, where roughly half the species occur. Nickrent and others argue that the genera Austroamericium Hendrych, Chrysothesium (Jaub. & Spach) Hendrych, Kunkeliella Stearn, and Thesidium Sond should be considered as part of this genus.
Species in this genus are parasitic on roots. Fruits of Thesium species are nutlike achenes.
8 branches of this genus, most-observed first
Bastard Toadflaxes
subgenusThesium
Cape Rootthugs
subgenusFrisea
Tropical Rootthugs
subgenusPsilothesium
Fours Rootthugs
subgenusHagnothesium
Disc Rootthugs
subgenusDiscothesium
Thesium hookeri
speciesThesium hookeri
Thesium vlachorum
speciesThesium vlachorum
Thesium erythronicum
speciesThesium erythronicum
Where it lives
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
Drag the globe to turn it. Dots are where records exist, not a range map; darker means more records.
In the old herbals & bestiaries
In the stacks
Searching the stacks…
Every page naming Thesium in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 146804.