Sida rhombifolia L.

Etymology Genus Greek for water lily or promegranate, but now used for this unrelated genus
Species Having rhomboid-shaped leaves
Family Malvaceae
Synonyms -
Common Names Arrow-leaf Sida
Status Undetermined
Form Shrub
Native Distribution Unknown but it is now found pantropically


Sida rhombifolia is a shrub that can be found in our open scrublands. It is easy to identify from the diamond-shaped serrated leaves and yellow flowers. However, it looks similar to another congener, Sida acuta. Despite this, the 2-3cm flower stalk is much longer and only have 1 or no projections on the seed (S. acuta is < 1cm and have 2 projections on the seed; Holm et al., 1977).

Interesting Facts:

The seeds (or more accurately, the mericap) are dispersed by adhering to clothing or animals using the sharp projections.

Shrubby form of the Arrow-leaf Sida.

Fruits. Note the long flower/fruit stalk.

Diamond-shaped serrated leaves.

Yellow flower.

Seed. Note the single sharp projection.


Holm LG & Plucknett DL & Pancho JV & Herberger JP. (1977) The World's Worst Weeds: Distribution and Biology. East-West Center/University Press of Hawaii. 609 pp.

Author: Jake
Posted: 2014-11-01 / Modified: 2019-08-27