Oriental lady's thumb
Scientific NamePolygonum caespitosum
Other Common Names:
Synonyms (former Scientific Names):
This erect, sprawling summer annual grows up to 3 1/2 feet in height. It flowers from mid summer till the first frost in the fall.
The alternately arranged leaves are elliptical in shape, although they can be lance-shaped. They are usually 1 to 3 inches in length, and 1/2 to 1 1/4 inches wide. The leaves are occasionally hairy.
The first true leaves are hairy
Flower Seed Head
The small, dark pink or red flowers occur in spikes at the tips of stems.
The seeds develop in a black achene.
This plant can be found in moist, disturbed areas
prostrate and nonwoody
Thorns or Spines
Approximate Flower Diameter
Dominant Flower Color
shorter than leaf
Stem Cross Section
round or oval