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Genus Mitrasacme Family Loganiaceae

Description: Annual or perennial herbs.

Leaves decussate or rosette forming, ± sessile; lamina 1- or 3–5-veined from base; margins entire.

Inflorescence terminal and/or axillary, cymose, often reduced to 1 flower. Flowers bisexual, usually 4-merous. Calyx tube about as long as lobes; lobes 4. Corolla urceolate, campanulate or trumpet-shaped, often bearded in mouth; lobes ± valvate in bud. Stamens inserted in lower half of corolla tube. Ovary superior. Styles 2, usually free at base, connate distally; stigma truncate to 2-lobed.

Fruit a septicidal capsule (dehiscing along the ventral suture), apically 2-horned (persistent bases of styles); seeds many, minute.

Distribution and occurrence: World: c. 55 species, Asia, Malesia, Australia, New Caledonia. Australia: c. 50 species (c. 44 species endemic), all States.

Text by B. J. Conn, edited by K.L. Gibbons June 2019
Taxon concept:

 Key to the species 
1Branches coarsely and densely hirsute, with long, more or less spreading hairs2
Branches glabrous or sparsely and shortly hairy; hairs more or less appressed3
2Plant prostrate or procumbent; inflorescence 1-floweredMitrasacme pilosa
Plant erect; inflorescence umbellate, 3–5-flowered
                       Back to 1
Mitrasacme polymorpha
3Inflorescence 1- or 2-flowered4
Inflorescence umbellate, 3–5-flowered
                       Back to 1
4Flowers almost sessile; corolla c. 2 mm long; perennial herb, prostrate or procumbentMitrasacme serpyllifolia
Flowers with pedicel up to 12 mm long; corolla 5–7 mm long; annual herb, mostly erect
                       Back to 3
Mitrasacme alsinoides
5Capsule 1.4–2.5 mm long; fruiting style <0.5 mm long, often bulbous below the stigmaMitrasacme paludosa
Capsule 4–6 mm long, fruiting style 1.5–1.8 mm long, never bulbous below the stigma
                       Back to 3
Mitrasacme pygmaea

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