Tribulus
Tribulus is a genus of plants in the family Zygophyllaceae and found in diverse climates and soils worldwide from latitudes 35°S to 47°N. The best-known member is T. terrestris, a widespread invasive species and weed.
Tribulus species are perennial, but some grow as annuals in colder climates. The leaves are opposite and compound. The flowers are perfect and insect-pollinated, with fivefold symmetry. The ovary is divided into locules that are in turn divided by "false septa".
Some species are cultivated as ornamental plants in warm regions. Some, notably T. cistoides, T. longipetalus, T. terrestris, and T. zeyheri, are considered weeds. Tribulus omanense is the national flower of the United Arab Emirates. Thirteen species of Tribulus are accepted by The Plant List, but there are many names still unresolved and needing further study.
List of accepted species
- Tribulus adelacanthus R.M.Barker
- Tribulus arabicus Hosni
- Tribulus astrocarpus F.Muell.
- Tribulus bimucronatus Viv.
- Tribulus cistoides L.
- Tribulus cristatus C.Presl
- Tribulus echinops Kers
- Tribulus eichlerianus K.L.Wilson
- Tribulus excrucians Wawra
- Tribulus forrestii F.Muell.
- Tribulus hirsutus Benth.
- Tribulus hystrix R.Br.
- Tribulus incanus Hosni
- Tribulus kaiseri Hosni
- Tribulus macrocarpus F.Muell. ex Benth.
- Tribulus macropterus Boiss.
- Tribulus megistopterus Kralik
- Tribulus micrococcus Domin
- Tribulus minutus Leichh. ex Benth.
- Tribulus mollis Ehrenb. ex Schweinf.
- Tribulus occidentalis R.Br.
- Tribulus omanense Hosni
- Tribulus parvispinus C.Presl
- Tribulus pentandrus Forssk.
- Tribulus platypterus Benth.
- Tribulus ranunculiflorus F.Muell.
- Tribulus securidocarpus Engl.
- Tribulus spurius Kralik
- Tribulus suberosus H.Eichler ex R.M.Barker
- Tribulus subramanyamii P.Singh, G.S.Giri & V.Singh
- Tribulus terrestris L.
- Tribulus zeyheri Sond.