Oxalis debilis var. corymbosa (DC.) Lourt.

Herb with leaves arising in a basal cluster; bulbs 1-3 cm long with numerous bulbils formed from the old bulbs. Leaves 10-20 per plant, of 3 obcordate leaflets, each 1-4 cm long and wide and notched at the tip. Flower clusters of 8-15 flowers. Petals 12-18 mm long, pink; spring to winter. Fruit not produced. [O. corymbosa DC.]

S America

This is a common garden weed in all mainland states, spreading through the numerous small bulbs at the top of the swollen, fleshy tap root.

Source: Spencer, R. (2002). Oxalidaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.

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kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Oxalidales
family       Oxalidaceae
genus        Oxalis L.
species         Oxalis debilis Kunth