Pseudanthus ligulatus



Pseudanthus ligulatus is a species of flowering plant in the family Picrodendraceae and is endemic to northern Queensland. It is a monoecious shrub with simple, lance-shaped or linear to narrowly oblong leaves and creamy white male and pale green female flowers arranged singly in upper leaf axils, but appearing clustered on the ends of branches.

Description
Pseudanthus ligulatus is a shrub that typically grows to a height of 0.5–1.5 m and has glabrous branchlets. The leaves are lance-shaped or linear to narrowly oblong, 7–12 mm long and 1.1–1.8 mm wide on a petiole 0.5–1.1 mm long with reddish-brown, triangular or egg-shaped stipules 0.5–1.3 mm long at the base. The leaves are glabrous. The flowers are arranged singly in upper leaf axils with bracts 0.5–1 mm long at the base, but appear to be clustered on the ends of branches. Male flowers are on a pedicel 0.5–1.8 mm long, the 6 tepals creamy white, 7–15 mm long and 0.5–0.9 mm wide and there are 6 stamens. Female flowers are sessile, the tepals pale green, 1.2-3.7 mm long and 0.6–1 mm wide. Flowering occurs in most months, and the fruit is an oval capsule 5.8–7 mm long.

Taxonomy and naming
Pseudanthus ligulatus was first formally described in 2003 by David Halford and Rodney Henderson in the journal Austrobaileya from specimens collected near Mareeba in 1989. The specific epithet (ligulatus) means ligulate, referring to the tongue-like tepals.

In the same journal, Halford and Henderson described two subspecies of P. ligulatus, and the names are accepted by the Australian Plant Census:
 * Pseudanthus ligulatus subsp. ligulatus Halford & R.J.F.Hend. is a shrub up to 1.5 m high with its leaves evenly distributed along the branchlets, the tepals of female flowers more than 2 mm long.
 * Pseudanthus ligulatus subsp. volcanicus Halford & R.J.F.Hend. is a shrub up to 0.5 m high with crowded leaves, the tepals of female flowers less than 2 mm long.

Distribution and habitat
Pseudanthus ligulatus grows in heath, woodland or forest, rarely in rainforest. Subspecies ligulatus occurs from the Mareeba district, south to Charters Towers and east to the Cumberland Islands in northern Queensland. Subspecies volcanicus is restricted to the Glasshouse Mountains in south-east Queensland, where it grows in rock crevices and on cliff faces.