The World Flora Online

Easily recognised by the short pungent leaves and star-like blue or purple perianth. The Australian Plant Census treats this genus within the family Calectasiaceae.

Etymology: from the Greek calos (beautiful) and ectasia (stretching out), in reference to the attractive perianth.

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Perennial herbs with rhizomes, erect stems and wiry roots. Leaves sessile, alternate, linear, the base indurated and closely sheathing stem, persistent. Flowers bisexual, sessile, solitary, terminal, surrounded by scarious bracts, scentless. Sepals and petals united in tube in lower half, the lobes spreading horizontally, stiffly scarious, blue or purple, variously pubescent outside. Stamens inserted at base of perianth lobes; anthers attached near base, linear, conspicuously exserted, yellow, often turning orange, red or brown. Style slender, exserted, turned to one side, exceeding stamens; stigma simple; ovary 1-locular; ovules 3, basally attached. Fruit indehiscent, enclosed in persistent, faded perianth.

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The Flora of Australia publication said a genus of three species, two endemic in south-western W.A., one in south-eastern S.A. and western Vic. The Australian Plant Census lists 11 species.

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A chromosome number n = 9 for Calectasia cyanea s. lat. was given by Anway (1969) but without citing a voucher.

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G.Bentham, Calectasia (in Juncaceae), Fl. Austral. 7: 120-121 (1878); J.C.Anway, The evolution and taxonomy of Calectasia cyanea R.Br. (Xanthorrhoeaceae) in terms of its present-day variation and cytogenetics, Austral. J. Bot. 17: 147-159 (1969).

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