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Hibbertia oligodonta S.T.Reynolds
Family Dilleniaceae
Hibbertia oligodonta S.T.Reynolds APNI*

Description: Erect shrub to 1 m high, sometimes becoming straggly, young branches densely hairy with crispate to spreading hairs, older branches glabrescent.

Leaves occasionally clustered on short branchlets, obovate or obovate-cuneate, occasionally narrowly elliptic-obovate, 10–35 mm long, 5–15 mm wide, apex obtuse to truncate, mucronate; margins dentate in the distal half with 1–5 teeth on each side of the midrib, rarely entire. Petiole and proximal midrib with crispate-spreading hairs.

Flowers sessile, solitary, terminating on short branchlets. Sepals 7–10 mm long, 6–8 mm wide, slightly keeled and apiculate apex, margins with crispate to spreading hairs. Inner sepals larger than the outer sepals. Petals 3–5 mm long. Stamens 25–40, surrounding carpels. Carpels 3, glabrous.

Seeds 1 or 2 per carpel, ± globose 2.5 mm diameter.


Flowering: September to April.

Distribution and occurrence: Recorded from the Grafton district through to the Border Ranges.

Usually growing on sandstone.
NSW subdivisions: NC
Other Australian states: Qld
AVH map***

Hibbertia oligodonta is known from central Queensland, particularly common on and around Blackdown Tableland.

It has been confused with H. diffusa but differs by having dense crispate to spreading hairs on erect stems, and sparesly toothed leaves. Juvenile leaves are often larger with more marginal teeth than adult leaves.

Further study is required to determine whether the plants from northern NSW are the same taxon as the central Queensland plants.

Text by A.E. Orme
Taxon concept: S.T. Reynolds; Austrobaileya 3(3): 1991, pages 535-536

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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