Dinosperma is a genus of plant containing the single species Dinosperma erythrococcum, commonly known as tingletongue, clubwood or nutmeg, and is endemic to north-eastern Australia. It is a tree usually with trifoliate leaves arranged in opposite pairs, the leaflets lance-shaped to oblong, and panicles of small white flowers, later bright orange to red, slightly fleshy follicles containing shiny, bluish black seeds.

Description
Dinosperma erythrococcum is a tree that typically grows to a height of  and is more or less glabrous. It has mostly trifoliate leaves arranged in opposite pairs on a petiole  long, the leaflets lance-shaped to oblong,  long and  wide, the side leaflets on petiolules up to  long, the end leaflet on a petiolule  long. The leaves have distinct but scattered oil dots. The flowers are arranged in panicles  long. The sepals are about  long, the white petals about  long, and there are eight stamens that are about the same length as the petals. Flowering mainly occurs from spring to early summer and the fruit is an elliptical, orange to red, slightly fleshy follicle  long containing glossy black or bluish black seeds.

Taxonomy
In 1858, Ferdinand von Mueller described Euodia erythrococca and published the description in Fragmenta phytographiae Australiae from specimens collected near Wide Bay and Moreton Bay. In 1997, Thomas Gordon Hartley raised the genus Dinosperma in the journal Adansonia and transferred von Mueller's plant as Dinosperma erythrococcum.

Distribution and habitat
Tingletongue grows in rainforest, often dry rainforest, at altitudes from  to  and occurs from the Kutini-Payamu National Park in far north Queensland to the headwaters of the Clarence and Richmond Rivers in north-eastern New South Wales.

Conservation status
This tree is listed as of "least concern" under the Queensland Government Nature Conservation Act 1992.

References

Zanthoxyloideae
Zanthoxyloideae genera
Monotypic Rutaceae genera
Flora of New South Wales
Flora of Queensland
Plants described in 1858
Taxa named by Thomas Gordon Hartley
Taxa named by Ferdinand von Mueller