Australian Tropical Rainforest Plants - Online edition

Tribulopis homalococca var. alifer (Domin) R.M.Barker

Herb (herbaceous or woody, under 1 m tall)
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Flower. © G. Sankowsky
Leaves and flowers. © CSIRO
Herbarium specimen. © DERM

Barker, R.M. (1998) Journal of the Adelaide Botanic Gardens 18(2): 92.


Fleshy prostrate annual herb to 30 cm tall. Stems pinkish, striate, appressed pubescent.


Leaflets appressed pubescent below, glabrous above, 1-3 veins from leaflet base; leaflet blades 5-12 x 4-6 mm, margins ciliate, leaflet stalks 0.5-0.75 mm long. Venation difficult to discern.


Flower buds rotund. Flowers 11-14 mm diam. Pedicels 11-15 mm long. Sepals about 4 x 2 mm, outer surface clothed in hairs. Petals 6-7 x 4 mm. Anthers about 1 mm long, filaments about 1 mm long. Ovary + style about 2 mm long, ovary longitudinally ribbed (5). Extrastaminal nectariferous disc with 5 lobes. Ovules one per locule. Stigma 5-ribbed and papillate.


Fruit a glabrous schizocarp topped by a persistent style and stigma, fruitlets each with a basal semicircular wing, 2.5-3 mm diameter with longitudinal wings on the locules containing developed seeds. Seeds 4-5 mm long. Embryo about 2 mm long, consisting mainly of cotyledons.


Features not available.

Distribution and Ecology

Occurs in the Chillagoe area of NEQ. Altitudinal range from 346-513 m. Grows in deciduous vine thicket.

Tribulus homalococcus var. alifer Domin, Bibliotheca Botanica 89(4): 834(1921), Type: Bei Chillagoe (DOMIN II. 1910).
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