Common name: Victorian Christmas Bush
Prostanthera lasiangustata B.J.Conn & K.M.Proft ex Carrick APNI* Description: Erect shrub (sometimes compact) to medium-sized tree 5–8 metres tall, although sometimes compact and 1–4 m tall. Branchlets mostly glabrous or with occasional hairs on ridges of lateral grooves, moderately to densely glandular. Leaves glabrous, or with occasional
Leaves glabrous, or with occasional hairs, or sparsely hairy, hairs antrorse, dark green above, paler below, margin often maroon; petiole to 2–15.5 mm long; lamina narrowly ovate, ovate to elliptic, 16–123 mm long, 6–29 mm wide, sparsely to densely glandular with sessile glands most distinctive on the abaxial surface, base cuneate or sometimes oblique, margin usually slightly recurved, irregularly toothed with 6–30 teeth per side, apex obtuse, venation faint or distinct, with midrib and basal secondary veins slightly raised on abaxial surface; slightly aromatic when crushed.
Inflorescence compound, usually with at least 30 flowers; pherophylls not persistent, narrowly ovate to narrowly obovate, 4–6 mm long, 1–2 mm wide. Pedicel 0.4–2 mm long; prophylls persistent, narrowly ovate to narrowly elliptic, often appearing almost linear, 1.4–3 mm long, 0.3–0.4 mm wide, base and apex tapering. Calyx mid green, usually with distinct maroon tinge, almost glabrous with an occasional hair, or sparsely to moderately hairy, hairs antrorse or spreading, moderately to densely glandular, tube 1.6–3.5 mm long, abaxial lobe 2–4 mm long, adaxial lobe 1–3.5 mm long. Corolla 10–14 mm long, pale mauve to almost white, with purple/lilac/maroon markings on inner surface of tube and lateral and base of adaxial lobe, with dull yellow-orange to pale orange dots on abaxial inner surface of tube and base of abaxial medial lobe. Stamens 7–13.5, connective appendage 0.1–0.2 mm long.
Fruiting calyx enlarged or not enlarged. Mericarps 2–3 mm long.
Flowering: November – February
Distribution and occurrence: Widespread throughout highland regions of Tasmania, Victoria and New South Wales. NSW subdivisions: NT, CC, SC, NT, CT, ST. Commonly found along watercourses and moist gullies, associated with wet sclerophyll forests. Establishes in disturbed sites such as along roads and other openings in the forest.
NSW subdivisions: CT
Text by Trevor C Wilson (February 2025) Taxon concept: Conn BJ, Henwood MJ, Proft KM, Scott JA, Wilson TC, Howes RS (2021) An integrative taxonomic approach resolves the Prostanthera lasianthos (Lamiaceae) species complex. Australian Systematic Botany 34(5) 438–476
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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