2118.000 Thesium L.

Description of the genus

Annual or perennial herbs or subshrubs, parasitic or hemiparasitic. Leaves sessile, alternate, scale-like or ± linear. Flowers bisexual, solitary or in cymes, each flower subtended by 1, often conspicuous, bract which is often adnate to the pedicel or peduncle and 2 bracteoles or (in T. atrum and T. fastigiatum) by an involucre of 4 or more bracts. Perianth (3-4-)5-lobed, often with conspicuous external glands on the perianth tube below the sinuses of the lobes. Stamens as many as lobes; anthers (in ours) attached to lobes by tufts of hairs. Ovary with 3 ovules. Stigma capitate. Fruit a nut, rarely fleshy, usually 10-ribbed, crowned with the persistent perianth.

Comment: A very difficult genus to identify in the field at species level. Almost all distinguishing features are based on measurements or characteristics of minute parts, which can only be seen and compared reliably under a microscope.

Worldwide: 325 species in the Old World

Zambia: 23 taxa.

The larvae of the following species of insect eat species of this genus:
Eicochrysops messapus (Cupreous blue)
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Links to taxa:     View: living plant images - herbarium specimen images - all images for this genus

SpeciesFZ divisionsProvincesContent
atrum A.W. HillS
bangweolense R.E. Fr. Lp
bequaertii Robyns & Lawalrée Cb
brachyanthum BakerN
dissitum N.E.Br.N,S
fanshawei HilliardW
fastigiatum A.W. HillC
fimbriatum A.W. HillC
goetzeanum Engl.C
inonoense HilliardN
kilmandscharicum Engl.
magnifructum HilliardW
megalocarpum A.W. HillW
myriocladum BakerS
schliebenii Pilg.N
schweinfurthii Engl.N
singulare HilliardW
subaphyllum Engl.Lk
thamnus Robyns & LawalréeLk
triflorum L.f.
unyikense Engl.Lk
ussanguense Engl.N
wilczekianum LawalréeNw

Other sources of information about Thesium:

Our websites:

Flora of Botswana: Thesium
Flora of Malawi: Thesium
Flora of Mozambique: Thesium
Flora of Zimbabwe: Thesium

External websites:

ePIC (electronic Plant Information Center): Thesium
Flora Zambesiaca web site: Thesium
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network) taxonomy for plants report for Thesium
IPNI (International Plant Names Index): Thesium
Kew Herbarium catalogue: Thesium

Copyright: Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde, 2011-19

Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A. (2019). Flora of Zambia: Genus page: Thesium.
https://www.zambiaflora.com/speciesdata/genus.php?genus_id=504, retrieved 22 April 2019

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