Family Caryophyllaceae.
Subfamily Alsinoideae, Tribe Alsineae.
Habit and leaf form. Herbs, or shrubs (rarely, subshrubs); non-laticiferous and without coloured juice. ‘Normal’ plants. Leaves well developed. Plants with roots; non-succulent; unarmed. Annual, or perennial. Leaves cauline. To 0.5 m high. Self supporting (or mat-forming). Mesophytic. Not heterophyllous, or heterophyllous (rarely). Leaves variable small to very large; not fasciculate; opposite; with blades; subsessile, or sessile; simple; not peltate. Leaf blades entire; flat; variable. Mature leaf blades adaxially glabrous; abaxially glabrous. Leaves without stipules. Leaf blade margins entire; flat. Leaf anatomy. Hairs absent; glandular hairs absent.
Reproductive type, pollination. Fertile flowers hermaphrodite. Unisexual flowers absent. Plants hermaphrodite. Floral nectaries present.
Inflorescence and flower features. Flowers aggregated in ‘inflorescences’, or solitary (rarely). Inflorescence few-flowered. Flowers in cymes. Inflorescences compound. The terminal inflorescence unit cymose. Inflorescences terminal. Flowers pedicellate; small; regular; tetracyclic, or tricyclic (rarely). Free hypanthium present (subperigynous). Perianth with distinct calyx and corolla, or sepaline (rarely); 10, or (4–)5 (rarely); 2 -whorled, or 1 -whorled (rarely); isomerous, or anisomerous (rarely). Calyx present; (4–)5; 1 -whorled; polysepalous; glabrous; valvate. Corolla present, or absent; 0, or 5; 0 -whorled, or 1 -whorled; polypetalous; contorted, or imbricate (rarely); white. Petals emarginate or bifid; sessile. Corolla members deeply bifid, or bilobed (emarginate). Androecium present. Fertile stamens present. Androecium (8–)10, or 5. Androecial members all equal; free of one another; 1 -whorled, or 2 -whorled. Androecium exclusively of fertile stamens. Stamens (8–)10, or 5; isomerous with the perianth, or diplostemonous (obdiplostemonous), or reduced in number relative to the adjacent perianth (rarely); oppositisepalous. Anthers separate from one another; dehiscing via longitudinal slits; introrse; bilocular; tetrasporangiate. Fertile gynoecium present. Gynoecium 1 carpelled. The pistil 1 celled. Gynoecium syncarpous; synovarious; superior. Ovary unilocular; 1 locular. Gynoecium stylate. Styles (2–)5, or 6 (rarely); free; simple. Stigmas (2–)5, or 6 (rarely); 1 - lobed. Placentation free central, or basal. Ovules campylotropous.
Fruit and seed features. Fruit 6–12 mm long; not hairy; dehiscent; a capsule. Dispersal unit the seed. Fruit 50 seeded (‘numerous’). Perisperm present. Seeds minute, or small.
Geography, cytology, number of species. Holarctic. Adventive. Not endemic to Australia. Australian states and territories: Western Australia, South Australia, Northern Territory, Queensland, New South Wales, Victoria, Australian Capital Territory, and Tasmania. South-West Botanical Province. 2n=30, 34, 36, 38, 40, 48, 52, 54, 72, 82–86, 90, 94–96, ca 108, ca 126, 144. A genus of ca 100 species; 4 species in Western Australia; 0 endemic to Western Australia.
Wheeler, Judy; Marchant, Neville; Lewington, Margaret; Graham, Lorraine (2002). Flora of the south west, Bunbury, Augusta, Denmark. Volume 2, dicotyledons. Australian Biological Resources Study. Canberra.
Blackall, William E.; Grieve, Brian J. (1988). How to know Western Australian wildflowers : a key to the flora of the extratropical regions of Western Australia. Part I : Dicotyledons (Casuarinaceae to Chenopodiaceae). University of W.A. Press. Perth.
Marchant, N. G.; Wheeler, J. R.; Rye, B. L.; Bennett, E. M.; Lander, N. S.; Macfarlane, T. D.; Western Australian Herbarium (1987). Flora of the Perth region. Part one. Western Australian Herbarium. Perth.
Publication or other use of content on this site is unauthorised unless that
use conforms with the copyright statement.