Arrowleaf sida

Appearance

The stems are erect to sprawling and branched, growing 50 to 120 centimeters in height, with the lower sections being woody. The dark green, diamond-shaped leaves are arranged alternately along the stem, 4 to 8 centimeters long, with petioles that are less than a third of the length of the leaves. The leaves are paler below, with short, grayish hairs. The apical half of the leaves have toothed or serrated margins while the remainder of the leaves are entire . The petioles have small spiny stipules at their bases.

The moderately delicate flowers occur singly on flower stalks that arise from the area between the stems and leaf petioles. They consist of five petals that are 4 to 8 millimeters long, creamy to orange-yellow in color, and may be somewhat reddish in the center. Each of the five overlapping petals is asymmetric, having a long lobe on one side. The stamens unite in a short column. The fruit is a ribbed capsule, which breaks up into 8 to 10 segments. The plant blooms throughout the year.

Naming

This species is usually confined to waste ground, such as roadsides and rocky areas, stock camps or rabbit warrens, but can be competitive in pasture, because of its unpalatability to livestock.

Uses

From The International Institute of Tropical Forestry, a division of the United States Department of Agriculture Forest Service:

Arrowleaf sida stems are used as rough cordage, sacking, and for making brooms. The stems have a high quality fiber and were once exported from India and elsewhere as “hemp” . Chemical analysis revealed that the leaves contain respectable amounts of nutrients: 74,000 to 347,000 ppm protein, 94,000 to 475,000 ppm carbohydrates, 33,000 to 167,000 ppm fiber, 14,000 to 71,000 ppm fat, and 16,000 to 81,000 ppm ash. However, it was reported that the root contained 450 ppm alkaloids and the presence of ephedrine and saponin . Another source reports an alkaloid content in the root of 0.1 percent and the presence of choline, pseudoephedrine, beta-phenethylamine, vascin, hipaphorine and related indole alkaloids . Perhaps because of these chemicals, arrowleaf sida is unpalatable to cattle . Arrowleaf sida has significant medicinal applications for which it is cultivated throughout India. The pounded leaves are used to relieve swelling, the fruits are used to relieve headache, the mucilage is used as an emollient, and the root is used to treat rheumatism . Australian Aborigines use the herb to treat diarrhoea. Leaves are smoked in Mexico and a tea is prepared in India for the stimulation it provides .


In Alor, Eastern Indonesia the leaves are used to treat boils, and the root is used to treat infant asthma.:56