A guess but looks about right using the 'look at pictures' technique of identification!

Parasitic on a kerbside Amaranthus deflexus - host plant severely deformed but identified by the prostrate growth habit, tepals (2-)3, fruits indehiscent, over-topping tepals, and by the leaves mostly obtuse (most seen had the apices withered off or severaly malformed by Albugo (Wilsoniana) pustules).

Voucher: P.J. de Lange 13444 & F.J.T. de Lange, UNITEC 10387