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  • COMMON NAME: Knucklehead Weed
  • ARABIC: ضريسه، ثريزه
  • BOTANICAL NAME: Sclerocephalus arabicus Boiss.
  • SYNONYMS: Paronychia sclerocarpa
  • FAMILY: CARYOPHYLLACEAE
  • KIND: Native
  • EMIRATE: Abu-Dhabi , Dubai , Ras-Al-Khaimah , Fujairah
  • GROWTH FORMS: Herbs
  • HABITATS: Slope (Rocky) Sandy
  • TYPES: Annual
  • REMARKS: Common in the east and northern east of the UAE. Wadi Wurayah National Park (WWNP).
https://www.floraofqatar.com/sclerocephalus_arabicus.htm Flora of the United Arab Emirates V1 & 2, Fawzi M.Karim, Nael M.Fawzi; reviewed by Fatima Al-Ansary. Al-Ain: United Arab Emirates University, 2007. Gary R. Feulner. 2014. The Flora of Wadi Wurayah National Park Fujairah, United Arab Emirates.

Annual, glabrous procumbent or suberect herbs, 5-15 cm high. Stems rigid, dichotomously branched. Leaves 4-20 mm long, 1 mm wide, linear-terete. Stipules scarious, very acute. Head spherical, 0.5-1 cm in diameter, comprising 3-7 flowers, concrescent with floral leaves and bracts. Floral leaves somewhat longer than calyx; bracts acute, membranous, shorter than calyx. Calyx 4-5 mm long; lobes narrow, straight, convex at back, crisp-woolly below. Fruiting head about 1 cm, echinate, hard. Seeds ovoid, brown about 2 mm long. 

Flowering from February to April.
Sandy and gravelly soil, or rocky places.
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