Hibbertia pilifera Toelken APNI*
Description: Small spreading to decumbent shrub to 0.15 m high, branches wiry with long decurrent leaf bases, tinged pink, sparsely shortsericeous to glabrescent.
Leaves often with short tufts of hairs (up to 0.2 mm long) in the leaf axils but usually hidden by appressed petiole; petiole 1.5–3.0 (–3.5) mm long; lamina linear, narrowly oblong-elliptic to -lanceolate, (4.6–) 5.0–7.5 (–8.8) × 0.6–0.8 mm, with apex drawn into a 0.1–0.25 mm long bristle which usually wears off with age, leaf base gradually constricted into petiole, adaxial surface ± flat, glabrous to glabrescent along flanks, abaxial surface with narrow but strongly revolute margins (glabrescent) and more than twice broader than central vein (glabrous), but with no undersurface visible except for a row of papillae along the slit.
Flowers single, terminal, becoming leafopposed along upper main branches; peduncle threadlike, (4.2–) 5.0–8.0 (–10.2) mm long, with bracts on lower third and often grading into 2–5 shorter leaves, recurved in bud and in fruit; buds narrowly ovoid; bracts linear-triangular, 1.2–1.5 × c. 0.25 mm, acute, with central vein scarcely visible, glabrescent. Calyx scarcely accrescent; outer calyx lobes narrowly elliptic-oblong, 4.2–4.4 × 1.4–1.6 mm, as long or scarcely shorter than inner ones, obtuse, without central ridge, pubescent or puberulous especially towards the apex, glabrescent; inner calyx lobes oblong-ovate, 4.8–5.0 × 1.8–2.3 mm, rounded or abruptly constricted into a short point, without ridge, glabrescent. Petals oblong-obovate to oblong-elliptic, 5.6–6.4 mm long, scarcely emarginate to lobed. Stamens 3–5 on one side of ovaries; filaments 1.2–1.3 mm long, 0.8–1.0 mm connate; anthers obloid, 1.5–1.7 mm long, abruptly constricted above and below. Pistils 2; ovaries obovoid but ± laterally compressed, with 4 ovules, glabrous, with styles attached to the lower half of the dorso-lateral surface and curved up on both sides of the stamen column to place the erect stigmas just above the apex of the anthers.
Fruits glabrous, seed not observed.
Flowering: September – November
Distribution and occurrence: Known from two widely separated localities, Bungonia State Conservation Area in the Southern Tablelands, and from near Black Mountain north east of Scone in the Central Western Slopes.
Grows in open eucalypt woodland in central New South Wales (CWS, ST). Dry sclerophyll woodland of Eucalyptus amplifolia, E. bosistoana and E. eugenoides.
NSW subdivisions: ST, CWS
Although superficially similar to H. rufa it is distinguished by its usually much branched habit above and below soil level, hairy branches and calyx lobes, cuneate bases of the leaf lamina, and 3–5 stamens. Hibbertia pilifera differs from H. surcularis by its hairy branches and calyx, calyx lobes without ridges towards the apex, 3–5 stamens and distinctly stalked flowers.
Text by A. E. Orme (edit Aug 2020); see Toelken, H.R. & Miller, R.T. (2012), Notes on Hibbertia (Dilleniaceae) 8. Seven new species, a new combination and four new subspecies from subgen. Hemistemma, mainly from the central coast of New South Wales. Journal of the Adelaide Botanic Gardens 25(1): 77-78
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