Trachymene Rudge
Trans.Linn.Soc.London 10:300, Tab.21 (1811)
Name Status: Current
Scientific Description
H.R. Coleman,
Friday 3 October 2008
Family Apiaceae.
Includes Uldinia.
Habit and leaf form. Herbs; bearing essential oils, or without essential oils (?); resinous, or not resinous (?). Annual, or biennial, or perennial; plants with a basal concentration of leaves, or with neither basal nor terminal concentrations of leaves. Helophytic, or mesophytic. Leaves small to medium-sized; alternate; ‘herbaceous’; petiolate to sessile; gland-dotted, or not gland-dotted (?); aromatic, or foetid, or without marked odour (?); simple; pulvinate, or epulvinate (?). Leaf blades dissected; 3-lobed to palmatisect; pinnately veined, or palmately veined. Leaves without stipules; without a persistent basal meristem. Leaf anatomy. Hairs present, or absent. Stem anatomy. Nodes multilacunar, or tri-lacunar (?). Secondary thickening developing from a conventional cambial ring, or anomalous (?); from a single cambial ring.
Reproductive type, pollination. Fertile flowers hermaphrodite. Unisexual flowers absent. Plants hermaphrodite. Entomophilous.
Inflorescence and flower features. Flowers aggregated in ‘inflorescences’. Inflorescence few-flowered, or many-flowered. Flowers in umbels. Inflorescences simple. The terminal inflorescence unit cymose, or racemose (?). Inflorescences terminal, or leaf-opposed; with involucral bracts. Involucral bracts often shortly connate towards the base. Flowers bracteate; small; regular; 5 merous (except for the gynoecium); cyclic; tetracyclic, or tricyclic. Free hypanthium absent. Perianth with distinct calyx and corolla (but the calyx reduced), or petaline (apparently, the calyx lobes minute); 5, or 10; 2 -whorled, or 1 -whorled; isomerous; white, or cream, or yellow, or pink, or blue. Calyx when detectable, 5; 1 -whorled; gamosepalous; persistent. Corolla 5; 1 -whorled; polypetalous; imbricate; regular; white, or cream, or yellow, or pink, or blue. Petals elliptic to obovate. Corolla members entire (apex obtuse, not incurved). Androecium 5. Androecial members free of the perianth; all equal; free of one another; 1 -whorled. Androecium exclusively of fertile stamens. Stamens 5; isomerous with the perianth; oppositisepalous; inflexed in bud. Anthers oblong to circular in outline; dehiscing via longitudinal slits; introrse; tetrasporangiate. Gynoecium 2 carpelled. The pistil 2 celled. Gynoecium syncarpous; synovarious; inferior. Ovary plurilocular; 2 locular. Gynoecium median. Epigynous disk present. Gynoecium stylate. Styles 2; free to partially joined (their bases thickened into a prominent, disc-like stylopodium crowning the ovary); apical. Stigmas wet type; non-papillate; Group IV type. Placentation axile, or apical (?). Ovules 1 per locule, or 2 per locule (usually two, but one abortive ?); pendulous; epitropous; non-arillate; anatropous.
Fruit and seed features. Fruit non-fleshy; hairy, or not hairy; spinose (bristly), or not spinose; a schizocarp. Mericarps (1–)2 (with obtuse or winged dorsal ribs). Seeds endospermic. Endosperm oily. Embryo well differentiated. Cotyledons 2. Embryo achlorophyllous; straight. Seedling. Germination phanerocotylar.
Physiology, biochemistry. Aluminium accumulation not found. Photosynthetic pathway: C3.
Geography, cytology, number of species. Native of Australia. Not endemic to Australia.
Economic uses, etc. Ornamental plant.
Taxonomic Literature
Wheeler, J.R. Marchant, N. G. Lewington, Margaret Graham, Lorraine Western Australian Herbarium (2002). Flora of the south west : Bunbury - Augusta - Denmark. Volume 2 : Dicotyledons. ABRS and W.A. Herbarium in association with UWA Press. Canberra.
Keighery, G.J. Rye, Barbara L. (1999). A taxonomic revision of Trachymene sect. Dimetopia (Apiaceae). Dept. of Conservation and Land Management. Como, W.A.
Rye, Barbara L. (1999). A taxonomic revision of the many-flowered species of Trachymene (Apiaceae) in Western Australia. Dept. of Conservation and Land Management. Como, W.A.
Wheeler, J.R. Rye, Barbara L. Koch, B.L. Wilson, A.J.G. Western Australian Herbarium (1992). Flora of the Kimberley region. Western Australian Herbarium. Como, W.A.
Marchant, N. G. (1987). Flora of the Perth region. Part 1. Western Australian Herbarium. [South Perth].
Blackall, William E. Grieve, Brian J. (1980). How to know Western Australian wildflowers : a key to the flora of the extratropical regions of Western Australia. Part 3A. University of Western Australia Press. Nedlands, W.A.
