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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 or sometimes 2. Corolla urceolate, campanulate or trumpet-shaped, often bearded in mouth; lobes ± valvate in bud. Stamens inserted in lower half of corolla tube. Ovary superior to semi-inferior. Styles 2, usually free at base, connate distally; stigma truncate to 2-lobed.

Fruit a loculicidal capsule, apically 2-horned (persistent bases of styles); seeds many, minute.


Photo © ANBG

Distribution and occurrence: World: c. 40 species, Asia, Malesia, Australia, New Caledonia, New Zealand. Australia: c. 38 species (c. 30 species endemic), all States.

Text by B. J. Conn
Taxon concept:

Taxa not yet included in identification key
Mitrasacme pygmaea

 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-flowered (calyx 4-lobed)4
Inflorescence umbellate, 3–5-flowered (calyx 2- or 4-lobed)
                       Back to 1
5
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
5Calyx 2-lobed; corolla 1.8–3.5 mm long, just exserted from calyx, lobes 0.6–1 mm longMitrasacme paradoxa
Calyx 4-lobed; corolla 3–5 mm long, lobes c. 2 mm long
                       Back to 3
Mitrasacme paludosa

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