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Hibbertia superans Toelken
Family Dilleniaceae
Hibbertia superans Toelken APNI*

Description: Small shrubs with few to many, weak twisting branches to 40 cm long.

Leaves linear, rarely linear-elliptic, (5.6-) 7.5 - 10 (-12.3) mm long, 0.9 -1.2 (-1.4) mm wide; apex acuminate to acute; base gradually tapering to petiole, petiole to 0.5 mm long; margins revolute, appearing thickened. Young branches and leaves covered with long silky hairs over a dense indumentum of short stiff hairs. Longer hairs often wearing off with age. Some scattered stellate hairs also present, particularly on the younger branches and the lower surface of leaves.

Flowers single; sessile or shortly pedicellate; terminal on main branches (or rarely on short shoots); bracts linear, 8.3 - 9.5 mm long, 1.0 - 1.3 mm wide, leaf-like with distinct central vein, villous sometimes becoming tomentose above and below. Calyx not accrescent; outer calyx lobes linear-lanceolate, acute, with slender central vein, villous-tomentose, mostly 7.5 - 9 mm long and 1.4 - 1.7 mm wide, much longer than inner lobes; inner calyx lobes oblong-elliptic to obovate, obtuse to rounded, 4.2 - 6.5 (-7.6) x 1.9 - 2.7 mm, outside villous over more or less appressed pubescent, inside rarely with a few appressed hairs towards the apex. Petals broadly obovate, 5.5 - 6.7 mm long, emarginate. Stamens 6 - 9, subequal; filaments basally connate, but often some more than others; anthers narrowly oblong, (1.4-) 1.6 - 1.8 mm long, dehiscing mainly by lateral slits. Pistils 2; ovaries laterally compressed, each with 4 ovules; style from outer apex of ovary, curved outwards and around the cluster of stamens to end at the apex of the outer anthers.

Fruit villous with very dense erect simple hairs. Seeds oblong-obovoid, often oblique, 1.5 - 1.7 x 1.1 - 1.4 mm, fleshy aril expanding into a scarcely lobed sheath adpressed to the base of seed, often to one side of base of seed.

Photo A.E. Orme

Photo A.E. Orme

Photo A.E. Orme

Other photo
Photo A.E. Orme

Flowering: Flowering: July – December.

Distribution and occurrence: Known chiefly from the north west Sydney region between Baulkham Hills and Wisemans Ferry, and in the lower Blue Mountains betweeen Blaxland and Winmalee. Also known from a disjunct occurrence near Mt Boss (inland from Kempsey) on the mid north coast of NSW. Ongoing research suggests that this northern occurrence represents a distinct species.

In the Sydney region it occurs in Dry Sclerophyll Forest on sandstone ridgetops. The northerly occurrence is on granite.
NSW subdivisions: CC, NC

Threatened species: NSW BCA: Endangered
AVH map***

Although known from two widely separated localities, it is never known to be common.

Text by A.E. Orme (2009); edited A.E. Orme (2018), (2024)
Taxon concept: Toelken, 2000

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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