Prostanthera lasianthos Labill.

Victorian Christmas Bush

Nov. Holl. Pl. 2: 18, t. 157 (1806) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Large shrub to small tree, 1–6(–12) m high, aromatic; branches glabrous or sparsely covered with short, curled hairs and subsessile glands. Leaves ovate (to narrow- or linear-ovate), (25–)40–120 mm long, (5–)10–32 mm wide, dark green above, paler below, glabrous, base cuneate to shortly attenuate, slightly oblique, margin toothed, occasionally teeth reduced or absent, apex acute to acuminate; petiole 6–10 mm long. Flowers in a terminal racemose or paniculate inflorescence; bracteoles persistent, 2–4 mm long, 0.2–0.4 mm wide. Calyx 4–5 mm long, tube 2–3 mm long, adaxial lobe 1.5–3 mm long (enlarged in fruit); corolla white to pale mauve with purple spots in throat, 10–15 mm long; anther appendage c. 1.5 mm long. 

CVU, DunT, EGL, EGU, GipP, Gold, GGr, HFE, HNF, HSF, MonT, NIS, OtP, OtR, SnM, Strz, VAlp, VRiv, VVP, WaP, WPro, Wim.

Throughout its range P. lasianthos is very variable, but 2 varieties are recognized, both in Victoria.

In the gorge of Cultivation Creek, western Grampians, it forms a hybrid with P. spinosa, the result being a sprawling shrub to 6 m wide, 1 m high, with weakly spinose branches, leaves ovate to spathulate, 4–20 mm long, 2–9 mm wide, weakly toothed, and the flowers solitary in axils.

Source: Conn, B.J. (1999). Lamiaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 4, Cornaceae to Asteraceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2018-08-24
 
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Distribution map

Victoria

Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Prostanthera lasianthos in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Prostanthera lasianthos in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Wilsons Promontory present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Strzelecki Ranges present native
Monaro Tablelands present native
Highlands-Far East present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
State
Queensland
New South Wales
Australian Capital Territory
Victoria
Tasmania