Leucopogon R.Br.
Prodr. 541 (1810)

Name Status: Current
Browse to the list of specimens for Leucopogon R.Br.
Photo of Leucopogon R.Br.

Scientific Description
H.R. Coleman, Friday 3 October 2008

Family Epacridaceae.

Habit and leaf form. Small trees, or shrubs; evergreen; leptocaul, or pachycaul. Helophytic to xerophytic. Leaves minute to medium-sized; alternate, or whorled; spiral, or four-ranked; ‘herbaceous’, or leathery; imbricate, or not imbricate; usually sessile, or petiolate; non-sheathing; simple. Leaf blades entire; flat, or rolled; palmately veined, or parallel-veined (in L. sect. Heteranthus); cross-venulate, or without cross-venules. Leaves without stipules. Leaf blade margins flat, or revolute. Stem anatomy. Nodes unilacunar. Secondary thickening developing from a conventional cambial ring.

Reproductive type, pollination. Fertile flowers hermaphrodite. Unisexual flowers absent. Plants hermaphrodite. Entomophilous, or ornithophilous. Pollination mechanism unspecialized.

Inflorescence and flower features. Flowers solitary, or aggregated in ‘inflorescences’; in spikes, or in racemes. Inflorescences terminal, or axillary. Flowers bracteate; bi- bracteolate; small; fragrant, or odourless; regular; 5 merous; cyclic; tetracyclic. Free hypanthium absent. Hypogynous disk present; intrastaminal; annular, or of separate members (5 scales). Perianth with distinct calyx and corolla; 10; 2 -whorled; isomerous. Calyx 5; 1 -whorled; polysepalous; imbricate; regular; persistent. Corolla 5; 1 -whorled; gamopetalous; lobed (lobes spreading or reflexed); valvate; regular; glabrous abaxially; hairy adaxially (lobes bearded inside with white woolly hairs); white, or pink; persistent, or deciduous. Androecium 5. Androecial members adnate (to the corolla); all equal; free of one another; 1 -whorled. Androecium exclusively of fertile stamens. Stamens 5. Staminal insertion in the throat of the corolla tube. Stamens remaining included, or becoming exserted (partially); isomerous with the perianth; oppositisepalous; all alternating with the corolla members. Filaments glabrous; short, slender, terete. Anthers basifixed, or adnate; becoming inverted during development, their morphological bases ostensibly apical in the mature stamens; non-versatile; dehiscing via longitudinal slits (by a single median slit); finally introrse (inverting during development); unilocular, or bilocular; bisporangiate; unappendaged (but their apices in L. ‘A’ sterile-tipped, generally paler and often recurved). Pollen shed in aggregates, or shed as single grains; without viscin strands; in tetrads. Gynoecium 2–5 carpelled. The pistil 2–5 celled. Gynoecium syncarpous; eu-syncarpous; superior. Ovary plurilocular; 5 locular, or 2–5 locular (or more in L. sect. Heteranthus). Gynoecium stylate. Styles 1; either very short or long and slender; attenuate from the ovary; apical; becoming exserted, or not becoming exserted. Stigmas 1; lobed; truncate, or clavate, or capitate. Placentation apical. Ovules 1 per locule; pendulous; non-arillate; anatropous.

Fruit and seed features. Fruit fleshy, or non-fleshy; indehiscent; a drupe. The drupes with one stone. Seeds endospermic. Endosperm oily. Seeds wingless. Embryo well differentiated. Cotyledons 2. Embryo 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, Queensland, New South Wales, Victoria, and Tasmania. South-West Botanical Province.

Additional characters Prophylls few.

Taxonomic Literature

Hislop, Michael (2012). Leucopogon navicularis (Ericaceae: Styphelioideae: Styphelieae), another local endemic from the midwest region of Western Australia [electronic resource].

Hislop, Michael (2011). A reinstatement and a new combination in Leucopogon (Ericaceae: Styphelioideae: Styphelieae) [electronic resource].

Hislop, Michael (2011). New, locally endemic taxa in Leucopogon (Ericaceae: Styphelioideae: Styphelieae) from the Perth and midwest regions of Western Australia [electronic resource].

Hislop, Michael (2008). Three new species of Leucopogon (Ericaceae: Styphelioideae: Styphelieae) from the far south-west of Western Australia.

Hislop, M.; Chapman, Alex R. (2007). Three new and geographically restricted species of Leucopogon (Ericaceae: Styphelioideae: Styphelieae) from south-west 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.

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.

Strid, Arne (1986). New species of Leucopogon and Conostephium (Epacridaceae) from SW Australia.

Blackall, William E.; Grieve, Brian J. (1981). How to know Western Australian wildflowers : a key to the flora of the extratropical regions of Western Australia. Part IIIB, (Epacridaceae-Lamiaceae). University of W.A. Press. Perth.