Scientific NameSida rhombifolia
Other Common Names:
This plant is actually a perennial shrub in the tropics but occurs as a summer annual in the U.S. Plants are erect, branched, and usually about 1 to 2 feet in height. Stems are covered with hairs and also have short spines (stipules) at the base of each leaf petiole.
The leaves are approximately 3/4 to 1 inch long. The upper 1/2 of the leaves have toothed or serrated margins while the leaf portions closest to the stem are untoothed. The leaves are broad and lance-shaped, and may be white and hairy underneath.
The seedlings have 2 heart-shaped cotyledons, plants have small spines that occur at the base of each leaf petiole, and leaves are rhomboid shaped with serrations that occur only on the upper half.
Flower Seed Head
Flowers consist of 5 yellow petals that are 4 to 8 mm long and occur on flower stalks that grow from the area between the stems and leaf petioles.
A capsule 5-8 mm wide.? Its seeds are about 2-3 mm long, feel smooth, and are dark brown.
Arrowleaf sida occurs in wastelands and along roadsides.? It is also a common weed of cultivated crops.
upright and nonwoody
Thorns or Spines
Dominant Flower Color
shorter than leaf
Stem Cross Section
round or oval