The species is dominant in the lower sandy watercourses of Jebel Uweinat following rains. It was noted in all of the wadis affected by the rains. It forms a continuous green carpet over the areas covered by running water, however becomes scarcer in the upper, rocky areas of the wadis. Both times it was approximately six to eight weeks following the rain event, and the plant was in full bloom. Sporadically the species can survive for up to a year following rain in favorable spots, some individuals in Karkur Talh survived in a green state up to March 2007. The species was not noted anywhere outside the watercourses, or at times unaffected by rains.

Lower Karkur Talh (Jebel Uweinat), in sandy wadi bed, 25th October, 1998

Middle Karkur Talh (Jebel Uweinat), in sandy wadi bed, 18th October, 2005

Middle Karkur Talh (Jebel Uweinat), in sandy wadi bed alongside Citrullus colocynthis and Panicum turgidum at the end of the water flow, 18th October, 2005

Tribulus pentandrus among tufts of Panicum turgidum in the central part of Karkur Talh (Jebel Uweinat), 18th October, 2005				Tribulus pentandrus intermingled with Morettia philaeana in central Karkur Talh (Jebel Uweinat), 18th October, 2005

Tribulus pentandrus forming a continuous green carpet in the Acacia raddiana grove. Middle Karkur Talh (Jebel Uweinat), 18th October, 2005
Upper Karkur Talh (Jebel Uweinat), in dried silty basins alongside Citrullus colocynthis and Schouwia thebaica, 19th October, 2005

Dense meadow of Tribulus under an Acacia raddiana grove. Lower Wadi Handal (Jebel Uweinat), 23rd October, 2005

Middle Karkur Idriss (Jebel Uweinat), in sandy wadi bed, 11th October, 2005 (Photos by Norbert Brügge)				Middle Karkur Ibrahim (Jebel Uweinat), in sandy wadi bed, 11th October, 2005 (Photos by Norbert Brügge)

Emeri highland (Jebel Uweinat), April 2006 (Photos by Alessandro Menardi Noguera)		Upper Karkur Talh (Jebel Uweinat), October 2006		Upper Karkur Talh (in centre of group of Cassia italica), October 2006

Middle Karkur Talh (Jebel Uweinat), March 2007