Robust, erect shrublets; internodes shorter than leaves; young parts variably minutely pubescent, or glabrous
Leaves ascending or spreading, usually decurrent, bluntly triquetrous, often subfalcate to falcate, usually 30-60 mm long, 10-30 mm in diameter, with sheath 2-6 mm long, greyish green, persistent; epidermis with convex cells or ± distinctly papillate
Flowers solitary or 3 together, lateral ones developing after marked interval, large, shortly pedunculate, opening in daytime; bracts embracing receptacle
Sepals 6, unequal, inner ones subulate, with membranous margins
Petals with outer ones longer, 1- or 2-seriate, inner ones narrower, 2- or 3-seriate, white, lemon, orange, pink or various shades of purple and red, centre often differently coloured
Stamens and staminodes in 6-8 series, conically collected, coloured, outer ciliately papillate in lower part, inner ones more densely papillate near middle
Fruit a 6-locular capsule of Ruschia type, obconic below; sutures strongly compressed; expanded valves widely spreading, wingless; expanding keels parallel below, diverging upwards, aristate; closing bodies and covering membranes well developed, with 2 processes or additional closing devices on underside near exit, obconical
Seeds covered with long, brown, papillate hairs, shortly echinate, tuberculate or muricate
x = 9
Flowering mainly in late summer
Distinguishing characters:
Robust perennials, erect, woody with large grey-green, smooth or textured leaves
Stems sheathing at their partially fused bases
Flowers large, solitary with bracts just below them
Seeds echinate, tuberculate or hairy
Nomenclature:
Astridia Dinter
Dinter: 430, 447 (1926)
Friedrich: 17 (1970)
Herre: 88 (1971)
Glen: 203 (1986)
Smith et al.: 348 (1998)
Distribution & Notes:
Southern Africa: Species 7, across the border between South Africa and Namibia, along the lower reaches of the Orange River. This is an extremely arid area of the Northern Cape
References:
DINTER, K. 1926. Twenty days in a botanist's paradise. Gardeners' Chronicle 8
FRIEDRICH, H.C. 1970. Aizoaceae. Prodromus einer Flora von Südwestafrika 27
GLEN, H.F. 1986. Numerical taxonomic studies in the subtribe Ruschiinae (Mesembryanthemaceae) - Astridia, Acrodon and Ebracteola. Bothalia 16
HERRE, H. 1971. The genera of the Mesembryanthemaceae. Tafelberg, Cape Town
SMITH, G.F., CHESSELET, P., VAN JAARSVELD, E.J., HARTMANN, H., HAMMER, S., VAN WYK, B-.E., BURGOYNE, P., KLAK, C. & KURZWEIL, H. 1998. Mesembs of the world. Briza, Pretoria
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