Australian Journal of
Taxonomy
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Hibbertia lanulipes K.R.Thiele, sp. nov.
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Type: Western Australia: Gravel pit off Griffin Reward Road just N of the Dumbleyung-Lake Grace road, 15 Sept. 2019, K.R. Thiele 5577 (holo: PERTH 9262008; iso: AD, CANB, K, MEL).

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Erect shrubs to 0.5 m high, multi-stemmed at base and probably resprouting after fire; young branchlets glabrous. Leaves scattered, spreading, oblong, (3–)4–6(–8) mm long, 1–1.2 mm wide, the margins strongly recurved to the prominent midrib, obscuring the abaxial lamina; petiole 0.5–1 mm long, the hypopetiole glabrous, dark brown, persistent as a woody peg on the stem, the epipetiole very short and densely woolly; adaxial lamina not tuberculate, minutely muricate, glabrous except at the very base where white-woolly; abaxial lamina (visible only by dissection) densely pubescent; abaxial midrib glabrous, minutely papillate laterally where it abuts the margins, rounded, ± level with the margins, with an obscure, pale sclerenchymatous central stripe bordered on either side by chlorenchyma; apex obtuse and shortly pungent-apiculate. Flowers sessile, terminal and terminating short-shoots; flower-subtending bracts 2 or 3, with a broadened pale base and a reddish-brown, scarious, narrowly triangular, acute lamina, the primary bract c. 1.5 mm long. Sepals broadly ovate to broadly elliptic, c. 5 mm long, the outer glabrous, the inner with sparse, minute substellate hairs where covered by the outer in bud; midribs not prominent; outer sepals shortly acuminate; inner sepals similar to the outer but less acuminate and broader. Petals 5, yellow, obovate, c. 7 mm long, broadly emarginate. Stamens 10, all on one side of the gynoecium and curving over it like a hand of bananas; filaments c. 0.7 mm long; anthers rectangular, c. 2 mm long, dehiscing by introrse, longitudinal slits. Staminodes absent. Carpels 2; ovaries compressed-globular, densely pubescent; styles curving excentrically from the carpel apex, c. 1.8 mm long. Ovules 4 per carpel. Fruiting carpels and seeds not seen.

Other specimen examined: near North Tarin Rock Nature Reserve, 28 July 1997, M.S. Graham 765 (PERTH 05051290).

Diagnostic features. May be discriminated from all other Western Australian Hibbertia species with stamens on one side of two pubescent carpels and shortly pungent glabrous leaves with the margins meeting the midrib below by the combination of densely woolly epipetioles, sessile flowers with glabrous outer sepals, and 4-ovulate carpels.

Phenology. The type specimen was flowering in mid-September.

Distribution & habitat. Occurs in south-western Western Australia, where currently known only from North Tarin Rock Nature Reserve and Neendaling west of Lake Grace, occurring in open shrub-mallee on white or brown sandy loam over laterite.

Conservation status. Hibbertia lanulipes is not currently known from land managed for conservation (although one occurrence is close to the boundary of a nature reserve); its conservation status should be assessed in the field.

Etymology. From the Latin lanula (diminutive of wool) and pes (a foot), in reference to the densely woolly epipetioles.

Notes. Hibbertia lanulipes is superficially similar to H. stowardii, sharing with it glabrous, smooth, ericoid leaves that are oblong in outline before contracting abruptly to a shortly pungent apex, and sessile flowers with ten stamens and no staminodes. However, H. stowardii has two ovules per carpel (four in H. lanulipes) and the epipetiole is quite glabrous.