A branching desert shrub that is superbly adapted to arid environments, Tribulus omanense has a stout base and very long tap roots, anchoring the plant in unstable, sandy conditions and increasing its ability to obtain water. The small, often overlapping leaves are oblong- or elliptical-shaped, growing in opposite pairs along the stems. Tribulus omanense produces bright yellow flowers on pedicels at the axils of smaller leaves, each composed of five distinct and widely spreading petals, with several nectar secreting glands fused to form a cup-like structure inside the flower (2).
There is much confusion surrounding the accepted taxonomy of Tribulus omanense, with some scientists considering this species to be a variant of Tribulus arabicus or Tribulus macropterus (var. arabicus) (2) (3).
Very little information is available on the biology of Tribulus omanense; however, it has been observed to flower and fruit between April and September (4), with the hardened fruit splitting into five segments when it becomes mature (2). It is a perennial species, often recorded in close association with the sedge species Cyperus conglomeratus(2)(3)(4).
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