chamber bitter
Phyllanthus urinaria L.


Phyllanthus urinaria is an erect to prostrate, slender, glabrous herb, 4-14 in. (10-35 cm) high. The stems branch often and can be reddish. It is native to Asia and the Pacific Northwest.
The papery leaves are alternate and about 0.2-0.4 x 0.08-0.2 in. (4-10 × 2-5 mm). They are oblong to nearly linear and sometimes slightly falcate. Leaves are bright to dark green above and gray-green to reddish tinged below.
Male and female flowers are on the same plant. Female flowers are along the first to the middle part of the leaf with male flowers from the middle to the tip. Flowers are very small and yellowish white.
Fruits are green, red or greenish-red, and is about 0.12 in. (3 mm) in diameter. The fruits are divided into three parts and their surface has raised scales.
Ecological Threat
P. urinaria can be found in a variety of different habitat types such as dry fields, roadsides, wastelands, and forest margins. P. urinaria is a symptomless carrier and potential host of Rastonia solanacearum in Taiwan. It can be found naturalized throughout the tropics.

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EDDMapS Distribution

EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit

State Regulated List

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit

State Regulated List
   No Data for this state
   Troublesome or Common weed in one or more crops

Most Troublesome / Most Common Agricultural Weed List
This map identifies those states that consider this species either most troublesome or most common in at least one commodity. For more information, visit the MTMC project page.

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Rosidae
Order: Euphorbiales
Family: Euphorbiaceae
Genus: Phyllanthus
Subject: Phyllanthus urinaria L.


Plants - Forbs/Herbs