1905D. Hutcheon inFlint & GilchristScience in S. Afr. 347A small plant called the ‘Dubbeltje Doorn’ — Tribulus Terrestrus Lin. — which springs up luxuriantly after rain, the time when the disease (sc. geeldikkop) becomes most prevalent.
1911Farmer’s Weekly 22 Mar. 11The disease ‘Geel-Dikkop’ of sheep is prevalent at the moment...It is..said to be due to eating the creeping plant called ‘dubbeltjedoorn’ after rains during the hot weather.
1912E. London Dispatch 13 Sept. 7The ever-increasing spread of the ‘Dubbeltje Doorn’ weed.
1917R. MarlothDict. of Common Names of Plants 24Dubbeltje or -doorn,..Several S. A. plants, decumbent or trailing on the ground, the fruits provided with sharp spines.
c1929Diseases & Pests Affecting Sheep & Goats (Cooper & Nephews) 86It has now been definitely proved by feeding experiments that the disease (sc. geeldikkop) is caused by eating the ‘dubbeltje doorn’ (tribulus terrestris) when in a wilted condition.
1979T. GutscheThere Was a Man 301Hutcheon’s men had later identified it with the Dobbeltjiedoorn (little double-thorn) or Tribulus terrestris.
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