Australian Tropical Rainforest Plants - Online edition

Platostoma longicorne (F.Muell.) A.J.Paton

Herb (herbaceous or woody, under 1 m tall)
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Herbarium specimen. © CSIRO

Paton, A.J. (1997) Kew Bulletin 52(2): 280.


Leafy stems clothed in hairs.


Leaves on inflorescence smaller than the rest. Leaf blades 25-80 x 10-18 mm, petioles 5-13 mm long. Lamina surfaces clothed in hairs, densely hairy on the midrib.


Flowers in inflorescences of 6-8 flowers. Inflorescence axis square in cross section. Calyx with 1 large upper lobe and 2 small lobes laterally on either side of large lobe (3 fused sepals), calyx hairy on outer side, lobes strongly recurved. Corolla campanulate with upper lip 3-lobed, lower lip 2-lobed, base of corolla tube with long conical spur; corolla tube and lobes hairy on the outside; stamens 2 upper inserted near the mouth and 2 lower near the base of the tube.


Calyx enlarges in fruit.


Testa smooth.

Distribution and Ecology

Occurs in CYP, NEQ and CEQ. Altitudinal range from near sea level to 1080 m. Grows in rainforest margins, Eucalypt forest, Casuarina forest, sclerophyll forest, various types of woodland, shrubland and in wooded grassland.

Ceratanthus longicornis (F.Muell.) G.Taylor, Journal of Botany, British and Foreign 74: 39(1936). Plectranthus longicornis F.Muell., Fragmenta Phytographiae Australiae 5(32): 51(1865), Type: In silvis ad sinum Rockinghams Bay. Dallachy.
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