Obbens, F.J. (18 December 2012), Three new species of Calandrinia (Portulaceae) from the Eremaean and South West Botanical Provinces of Western Australia. Nuytsia 22(6): 359-362, Figs 3, 6-8 APC [tax. nov.]

• Type: "Pinjarrega Nature Reserve, Western Australia, [precise locality withheld for conservation reasons], 8 October 2008, W. Chow & S. Downes Bent 18 WC03 (holo: PERTH 08172781; iso: CANB)."

taxonomic synonym: Calandrinia sp. Woodleigh (G.J.Keighery & N.Gibson 961) [n/a]

• APC Dist.: WA

• Etymology: "The specific epithet refers to the 'hidden or concealed' (L: opertus) opening of the flowers."

Parker, C.M. & Biggs, L.J. (1 May 2014), Updates to Western Australia's vascular plant census for 2013. Nuytsia 24: 54 [secondary reference]

taxonomic synonym: Calandrinia sp. Woodleigh (G.J.Keighery & N.Gibson 961) [n/a]

Hershkovitz, M.A. (21 September 2020), Rumicastrum Ulbrich (Montiaceae): a beautiful name for the Australian calandrinias. Phytologia 102(3): 120 [basionym]

basionym of: Rumicastrum opertum (Obbens) Hershk. legitimate

Hershkovitz, M.A. (September 2023), Notes on the taxonomy of Parakeelya Hershk. (Montiaceae). International Journal of Scientific Development and Research 8(9): 119 [basionym]

basionym of: Parakeelya operta (Obbens) Hershk. legitimate

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