Common name. Myoporums. Family Myoporaceae.
Habit and leaf form. Small trees, or shrubs; deciduous; resinous (to viscid). Young stems cylindrical. To 0.3–20 m high. Mesophytic, or xerophytic. Leaves minute to medium-sized; alternate, or opposite (rarely); usually spiral; ‘herbaceous’, or leathery, or fleshy; petiolate, or sessile; non-sheathing; gland-dotted; simple; epulvinate. Leaf blades entire; linear, or ovate, or obovate, or oblong. Mature leaf blades glabrous, or pubescent (rarely). Leaves without stipules. Leaf blade margins entire, or serrate, or dentate. Leaves without a persistent basal meristem. Stem anatomy. Nodes unilacunar. Secondary thickening developing from a conventional cambial ring.
Reproductive type, pollination. Fertile flowers hermaphrodite. Unisexual flowers absent. Plants hermaphrodite.
Inflorescence and flower features. Flowers solitary (rarely), or aggregated in ‘inflorescences’ (usually, by contrast with Eremophila); axillary. Inflorescence few-flowered to many-flowered. Flowers when aggregated, in cymes. The terminal inflorescence unit cymose. Inflorescences axillary; the flowers opening more or less simultaneously. Flowers pedicellate; ebracteate; small (less than 8 mm long — i.e. smaller than in Eremophila); almost regular to very irregular; slightly zygomorphic; more or less 5 merous; cyclic; tetracyclic. Free hypanthium absent. Perianth with distinct calyx and corolla; (9–)10; 2 -whorled; isomerous, or anisomerous (rarely). Calyx present; (4–)5; 1 -whorled; basally gamosepalous, or polysepalous; lobed; imbricate, or valvate; regular, or unequal but not bilabiate (subequal); persistent; non-accrescent; with the median member posterior. Calyx lobes ovate to triangular. Corolla present; (4–)5(–6); 1 -whorled; gamopetalous; lobed. Corolla lobes markedly shorter than the tube, or about the same length as the tube, or markedly longer than the tube. Corolla imbricate; campanulate; almost regular, or bilabiate (abaxial lobes somewhat larger); glabrous abaxially; hairy adaxially, or glabrous adaxially; plain, or with contrasting markings; often white, or pink to purple (tinged). Androecial members definite in number. Androecium (3–)4(–5). Androecial sequence not determinable. Androecial members adnate (to the corolla tube); all equal (nearly always), or markedly unequal (M. beckeri); free of one another; 1 -whorled. Androecium exclusively of fertile stamens (the upper, posterior member usually lacking). Stamens (3–)4(–5); becoming exserted, or remaining included; of M. beckeri didynamous; reduced in number relative to the adjacent perianth, or isomerous with the perianth (rarely); fertile stamens representing the posterior-lateral pair and the anterior-lateral pair; oppositisepalous. Filaments hairy, or glabrous. Anthers separate from one another; dorsifixed; straight, or recurved; versatile; dehiscing via longitudinal slits; introrse; unilocular (the cells confluent). Gynoecium 2 carpelled. The pistil 2 celled, or 3–10 celled (by secondary segmentation of the locules). Carpels reduced in number relative to the perianth. Gynoecium syncarpous; eu-syncarpous; superior. Ovary plurilocular; 2 locular. Locules secondarily divided by ‘false septa’, or without ‘false septa’. Gynoecium median. Ovary sessile. Gynoecium stylate. Styles 1 (straight); from a depression at the top of the ovary; apical; hairy, or hairless. Stigmas 1; 1–2 - lobed (? notched at apex); dry type; papillate; Group II type. Placentation axile, or apical, or axile to apical. Ovules 1–2 per locule; funicled; pendulous; non-arillate; anatropous.
Fruit and seed features. Fruit fleshy, or non-fleshy (rarely); indehiscent; a drupe. The drupes with separable pyrenes (the segments one-seeded). Fruit 2–10 celled; 2–10 locular; 2–10 seeded. Seeds 1 per locule. Seeds scantily endospermic, or non-endospermic. Cotyledons 2. Embryo more or less straight. Seedling. Germination phanerocotylar.
Physiology, biochemistry. Aluminium accumulation not found.
Special features. Corolla tube more or less straight.
Geography, cytology, number of species. X = 27.
Economic uses, etc. Myoporum species show significant horticultural potential and are good sources of sesquiterpenes (Richmond & Ghisalberti, 1995).
Etymology. From the Greek for "to be shut or closed" and "pore"; refers to the closed appearance of the glands on the leaves.
FloraBase is produced by the staff of the Western Australian Herbarium, Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions. Publication or other use of content on this site is unauthorised unless that use conforms with the copyright statement.
Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/