Alternanthera sp. 1

Plains Joyweed

sensu Fl. Victoria 2:214 (1996) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: data deficient (k)

Prostrate, usually stoutly taprooted perennial with stems to c. 15 cm long, sometimes rooting from lower nodes, pubescent (at least when young) along opposite lines on internerves and at nodes. Leaves ovate to obovate, 5–15(–25) mm long, 2–8 mm wide, glabrescent; margins minutely, sometimes distantly, serrate. Flowers in axillary ovoid spikes, 3–8 mm long; bracts and bracteoles ovate, 0.5–1.5 mm long; tepals equal, ovate to lanceolate, usually 1.5–2.5(–3) mm long, 1–1.3 mm wide, white or pinkish, glabrous, often thickening and becoming fused with age toward the base; anthers usually 3, staminodes absent. Fruit obcordate, c. 1.5 mm long and wide.  Flowers Oct.–Mar.

MuF, Wim. Also NSW, ACT. Occurs chiefly on clayey, often gilgai, soils of the Riverina and closely adjacent areas, also on drier clays and clay-loams derived from basalt in the Keilor–Werribee–Bacchus Marsh area.

The taxonomic status of this entity is uncertain.  Although usually readily distinguishable from Alternanthera denticulata on leaf and flower characters, there is some overlap in measurements. Ecologically, its preference for heavier soils which may be winter-wet suggests it to be distinct from A. denticulata.  It is also closely related to A. nana of Queensland and New South Wales (and ?Northern Territory) which is a short-lived herb, usually with larger and relatively broader leaves. 

Source: Walsh, N.G. (1996). Amaranthaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2018-01-08
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Caryophyllanae
family Amaranthaceae
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Alternanthera sp. 1 in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Alternanthera sp. 1 in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present native
Murray Fans present native