Habit and leaf form. Herbs (with a taproot); bearing essential oils, or without essential oils (?); resinous, or not resinous (?). Annual, or biennial; 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; more or less sheathing. Leaf sheaths with free margins. Leaves gland-dotted, or not gland-dotted (?); aromatic, or foetid, or without marked odour (?); compound; not peltate; pulvinate, or epulvinate (?); bipinnate, or multiply compound (tripinnate). Leaf blades pinnately veined. Leaves with stipules, or without stipules (?); without a persistent basal meristem. Leaf anatomy. Hairs present (hispid). 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’; in umbels. Inflorescences compound. The terminal inflorescence unit cymose, or racemose (?). Inflorescences terminal; the central flowers often sterile; ray bracts present; with involucral bracts, or without involucral bracts. Flowers bracteate, or ebracteate. Bracts when present, several, 3-pinnatisect or entire. Flowers small; regular to somewhat irregular (?); 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; 5, or 10; 2 -whorled, or 1 -whorled; isomerous; white to yellow, or pink to purple. Calyx present to vestigial, or absent; when detectable, 5; 1 -whorled; gamosepalous; shortly lobed. Corolla 5; 1 -whorled; polypetalous; valvate; unequal but not bilabiate, or regular (?); white to yellow, or pink to purple. Petals obovate. Corolla members bilobed. Fertile stamens present, or absent (sterile flowers). Androecium 5. Androecial members free of the perianth; all equal to markedly unequal (?); free of one another; 1 -whorled. Androecium exclusively of fertile stamens. Stamens 5; isomerous with the perianth; oppositisepalous; inflexed in bud. Anthers dehiscing via longitudinal slits; introrse; tetrasporangiate. Fertile gynoecium present, or absent (sterile flowers). 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 conical 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; spinose (bristly); a schizocarp. Mericarps 2 (with 5 filiform ciliate primary ribs and 4 stouter secondary ribs usually with a single row of bristles). 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. Australian states and territories: Western Australia, South Australia, Northern Territory, Queensland, New South Wales, Victoria, Australian Capital Territory, and Tasmania.
Economic uses, etc. Important food plant (carrot).
Additional characters Petals inflexed.