Hibbertia circinata K.L.McDougall & G.T.Wright APNI*
Description: Erect shrub to 1.5 m tall, with several to many stems, pubescent with simple, spreading to subappressed, straight, crisped or coiled hairs 1 -2 mm long.
Leaves sessile with broad, partly stem-clasping bases; lamina oblanceolate (or occasionally oblong to almost spathulate), entire (or rarely, irregularly toothed near apex), 15−55 mm long, 5−12 mm wide, discolorous; adaxial surface dark green, pubescent; abaxial surface pale grey-green, pubescent; apex obtuse, but the midrib protruding as a straight or recurved callus point to 1 mm long; margins flat but often recurving on drying.
Flowers axillary, sessile, solitary; subtended by 2−4 leaf-like bracts 3–12 mm long grading toward normal leaves at the base. Sepals 5–7 mm long, 3 mm wide, ovate to obovate, obtuse to subacute; outer 3 sepals sparsely to densely pubescent with simple hairs on both surfaces, inner 2 sepals usually slightly longer than outer sepals, glabrous or with a few scattered hairs. Petals 5, yellow, obovate, 9–13 mm long, 7–11 mm wide, broadly emarginate. Stamens 9–13, surrounding carpels, ±equal in length; filaments c. 1.5 mm long, free; anthers ± rectangular, c. 1.0 mm long, obtuse, dehiscing by terminal slits. Carpels 3, laterally compressed, glabrous; style divergent, flattened, 1–2 mm long.
Fruit not observed.
Flowering: Flowering has been observed at most times of the year but seems most prolific in spring.
Distribution and occurrence: Grows in shrubby woodland dominated by Eucalyptus sieberi. Known only from the summit area of Mount Imlay, south-west of Eden.
NSW subdivisions: SC
Threatened species: NSW BCA: Critically Endangered
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